Petroleum最新文献

{"title":"Investigation of low water recovery based on gas-water two-phase low-velocity Non-Darcy flow model for hydraulically fractured horizontal wells in shale","authors":"Yong He ,&nbsp;Jianjun Wang ,&nbsp;Xiaoqing Huang ,&nbsp;Yue Du ,&nbsp;Xiang Li ,&nbsp;Wenshu Zha ,&nbsp;Daolun Li","doi":"10.1016/j.petlm.2022.03.005","DOIUrl":"https://doi.org/10.1016/j.petlm.2022.03.005","url":null,"abstract":"<div><p>Various mechanisms are employed to interpret the low water recovery during the shale-gas production period, such as extra-trapped water in the fracture network, water imbibition due to osmotic pressure and capillary pressure. These lead to the difficulty of water flow, which could be described by low-velocity non-Darcy's law known as threshold pressure gradient (TPG). In this paper we firstly employ the low-velocity non-Darcy's law to describe the water flow and use Darcy flow accounting for slip flow and free molecular flow mechanisms to model gas flow in the shale formation. The sensitive study using numerical simulation shows that the proposed flow model could model the low fracturing liquid recovery and that large pseudo TPG leads to lower fracturing liquid recovery. Thus, the proposed model would give new insight to model the low water recovery in shale formations.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 3","pages":"Pages 364-372"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New design method of unequal taper thread (UTT) pairs and its application in API NC38 thread improvement","authors":"Hangming Liu ,&nbsp;Yangye He ,&nbsp;Jifang Wan ,&nbsp;Lin Chen ,&nbsp;Xianzhong Yi ,&nbsp;Song Hou ,&nbsp;Yanbin Wang ,&nbsp;Dongxu He ,&nbsp;Gang Li","doi":"10.1016/j.petlm.2023.04.004","DOIUrl":"https://doi.org/10.1016/j.petlm.2023.04.004","url":null,"abstract":"<div><p>API standard threads are the most commonly used thread configurations for drill pipe joints in the petroleum industry. Recently with the increasing application of horizontal wells and extended-reach wells in drilling engineering, drill pipe joint threads are subjected to complex loads, and drill pipe joint thread breakage accidents occur frequently. The API NC38 threaded pair used in the SU36-8-4H2 well suffered a fracture accident. Macroscopic analysis found that the fracture sites were located near the root of the first engagement pin-thread where the stress was greatest. Therefore, it is necessary to find an alternative method to reduce the largest stress of NC38 threads. Then, a new design method of unequal taper thread (UTT) pairs is proposed that the taper of pin thread, slightly smaller than the taper of matched-box thread, is not equal to one of box-thread. In the UTT pairs of API NC38 thread, the taper of box thread is kept as the standard taper of 1:6, but the taper of pin thread is, respectively, 1:6.1 (UTT-I), 1:6.2 (UTT-II), 1:6.3 (UTT-III) and 1:6.4 (UTT- IV). The 3D finite element models of four UTT pairs and one standard pair based on NC38 thread were developed, and the mechanical properties of five thread pairs bearing such typical working loads as torque, axial compression, axial tension, bending moment, internal and external pressure, were analyzed. The results show that four UTT pairs are superior to the standard pair of API NC38, and UTT-III has the most performance in all of four UTT pairs. Compared with the standard pair of API NC38, UTT-III pair can improve the bearing capacity such as torsion strength, compression strength, tensile strength, bending strength, strength against internal and external pressure, by 24.8%, 13.2%, 22%, 9.99% and 14.2%, respectively. The new design method of UTT pair enhances the bearing capacity of API NC38 thread, and has been applied in Changqing Drilling Company of CNPC Chuanqing Drilling Engineering Company Limited. The UTT-thread pair method is not only applicable for API series threads to improve the connection performance, but also suitable for various non-API taper connection threads to promote existing working ability such as air tightness, stress corrosion resistance, fatigue resistance et al.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 3","pages":"Pages 439-453"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49704633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depositional facies and reservoir characteristics of the Early Cretaceous Lower Goru Formation, Lower Indus Basin Pakistan: Integration of petrographic and gamma-ray log analysis","authors":"Qamar UZ Zaman Dar ,&nbsp;Pu Renhai ,&nbsp;Shahid Ghazi ,&nbsp;Shakeel Ahmed ,&nbsp;Rana Imran Ali ,&nbsp;Mubashir Mehmood","doi":"10.1016/j.petlm.2021.09.003","DOIUrl":"https://doi.org/10.1016/j.petlm.2021.09.003","url":null,"abstract":"<div><p>The sand intervals of the Early Cretaceous Lower Goru Formation are a conventional reservoir, generally distributed in the Middle and Lower Indus Basin of Pakistan. Lithostratigraphically formation is classified into two parts; the upper parts are predominantly composed of shale, siltstone, and thin layers of alternate shale and sandstone, while the lower parts are composed of sandstone with interlayering of shale and limestone. The sandstone of the Lower Goru Formation has been further divided into A, B, C, and D sand intervals based on reservoir quality. Detailed depositional facies and reservoir characteristics are essential for the evaluation of hydrocarbon exploration and development. This paper aims to evaluate the depositional environment and reservoir characterization of the siliciclastic reservoir of the Early Cretaceous Lower Goru Formation by integrating the gamma-ray log patterns and petrographic analysis and scanning electron microscopic (SEM) analysis. Petrographic characterization of the sand intervals and Gamma-ray log signatures were used for the interpretation of the depositional environment of the reservoir intervals. Petrographic analysis reveals that the sandstone of the Lower Goru Formation is fine-to medium-grained, well-sorted, arkose or feldspathic arenite. Primary intergranular macroporosity, secondary intragranular macropores, and Intercrystalline micropores were identified within the sandstone by the SEM analysis. The diagenetic analysis suggests that the sandstone possesses high porosity, low permeability, and has undergone significant alterations such as compaction, quartz cementation, feldspar dissolution, and clay minerals alteration. Five electrofacies are interpreted based on gamma-ray log patterns including (1) funnel shape (FA); (2) bell shape (FB); (3) cylindrical shape (FC); (4) bow shape (FD); and (5) serrated shape (FE) patterns. The interpreted facies results reveal shoreface environment for A-sand, Tidal flat for B-sand, mixed tidal flat for C sand, Tide dominated mixed for D-sand, and transgressive shelf for E−sand. The present study will be helpful for the assessment of the reservoir quality of the Early Cretaceous Lower Goru Formation for further exploration and development in the Indus Basin of Pakistan.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 3","pages":"Pages 331-341"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the viability of nanoparticles in drilling fluids as additive for fluid loss and wellbore stability","authors":"Albertus Retnanto ,&nbsp;Rommel Yrac ,&nbsp;Abdullah Shaat ,&nbsp;Adhika Retnanto ,&nbsp;Laith Abughaush ,&nbsp;Maha Al Sulaiti ,&nbsp;Najla Badar","doi":"10.1016/j.petlm.2023.02.005","DOIUrl":"https://doi.org/10.1016/j.petlm.2023.02.005","url":null,"abstract":"<div><p>Wellbore instability is an issue that, if left untreated, can cause wells to collapse, resulting in human, environmental, equipment, and revenue losses. Drilling fluids have been used to enhance the drilling process by lubricating and cooling the drill bit, eliminating cuttings, and most importantly, by improving the stability of the well by preventing fluid loss. However, there has been an increase in operational demands and challenges that call for drilling fluids to be more effective, economical, sustainable, and environmentally friendly. With shales that have infinitesimally small pores, nanoparticle additives in drilling fluids can be crucial in providing the properties that are necessary to prevent fluid loss and provide wellbore stability while meeting the operational demands of the present day. Therefore, this paper examines the use of nanoparticle additives including copper (II) oxide (CuO), magnesium oxide (MgO), and aluminum oxide (Al₂O₃) where they are tested under three conditions using the permeable plugging tester (PPT), high-temperature high-pressure (HTHP) fluid loss apparatus, and API low-temperature – low-pressure (LTLP) fluid loss apparatus under concentrations of 0.03% and 0.10%. Finally, based on the results, each nanoparticle sample (particle sizes between one and 100 nm) performed well in contributing to the aim of this project. CuO is the most effective inhibitor across all concentrations and under the three different conditions. It contributed to reducing the fluid loss from 37.6 mL to 18.2 and 13.2 mL, which is between 52% and 65% of fluid reduction. For MgO, it contributed to fluid loss reduction to 23.8 mL and 15 mL, which translated to 37%–60% of fluid loss reduction. The use of Al₂O₃ nanoparticles resulted in a fluid loss reduction to 33.6 mL and 17.8 mL, reducing the fluid loss up to 11%, at HTHP and up to 53% at LTLP. Unlike CuO and MgO, Al₂O₃ was less effective under HTHP conditions when compared to LTLP conditions. Al₂O₃ did not suffer as a significant diminishing benefit with increasing concentration in LTLP conditions however which means that at a higher concentration, it may begin to be more effective. Each material used in this study has its own specific and technical characteristics that will help create a progressive amount of property, such as providing stability and withstanding the high-temperature and high-pressure condition downhole.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 3","pages":"Pages 342-351"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Approach for C1 to C2 products commencing from carbon dioxide: A brief review","authors":"","doi":"10.1016/j.petlm.2023.07.002","DOIUrl":"10.1016/j.petlm.2023.07.002","url":null,"abstract":"<div><p>The carbon dioxide (CO₂) conversion to useable compounds remains a great contest to scientists, engineers, and environmentalists with regard to the reverse of the oxidative degradation of organics. This conversion is essential for the development of complementary fuels and raw materials for various industries, which in turn will help in avoiding the drastic increase in tropospheric temperature due to greenhouse effect leading to global warming. The solar energy is the earth's essential power source along with the other various forms of energy for example fossil fuels, hydropower, wind, and biomaterials, etc. The final goal is to establish the artificial photosynthesis, which can be replicated thru various chemical reduction techniques of CO₂ by employing appropriate photo-, thermal- and electro-catalysts in order to produce different one carbon atom (C₁) and higher carbon atoms containing products. Besides, the utilization of clean and sustainable CO₂ towards high-value products is of great interest today due to the recognized environmental worries and subsequent lessening of the fossil fuels utilization load to meet the energy demand of mankind. This way, solar energy can directly and/or indirectly be altered and stored in chemical energy form for industrial as well as societal applications. In this article our endeavor is to summarize the advances in CO₂ chemical reduction research area till date especially in free radical-based methods such as electrochemical, photochemical and plasma chemical for the development of carbon species up to two carbon (C₂) atoms containing products perceived in the chemical reduction of CO₂. The author hopes that this piece of work will be helpful to researchers and readers who are focused on the field of CO₂.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"10 3","pages":"Pages 373-398"},"PeriodicalIF":4.2,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2405656123000500/pdfft?md5=d6b50841be8e3b6ee6ce68de9365935e&pid=1-s2.0-S2405656123000500-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88035924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation of surfactant adsorption during EOR and soil pollution control processes: Influence of surfactant concentration, water salinity, and clay type","authors":"","doi":"10.1016/j.petlm.2023.06.003","DOIUrl":"10.1016/j.petlm.2023.06.003","url":null,"abstract":"<div><p>Surfactant injection is a well-established method of chemical EOR processes. Surfactant adsorption into clay layers can prevent their proper performance and thus reduce the oil recovery factor. On the other hand, this adsorption property of clay materials can be used to prevent surface and underground water pollution and reduce soil pollution. In this experimental study, the effect of surfactant concentration, electrolyte type (NaCl and MgCl₂), and the solution salinity on fluid adsorption into the interlayer space of different clay types (bentonite and kaolinite) was investigated. XRF analysis was conducted on two relevant clay samples, and immersion and Washburn tests were performed on the desired samples with the Sigma 700 setup. Then, according to the clay type, the most optimal conditions were introduced for the surfactant solution used in the two areas of EOR and environmental processes related to reducing soil pollution. In the EOR processes, the optimal condition for the lowest adsorption amount is C (with 1 CMC concentration and salinity of 100,000 ppm for NaCl salt). This fluid works better in kaolinite formations. In the environmental field related to the reduction of soil pollution, if the pollutants we are looking for are R and S (with alkyl benzene sulfonic acid as the dominant agent), bentonite has a better performance than kaolinite in terms of adsorption and subsequently pollution control. If the polluting fluid contains MgCl₂ ions in the exact salinity values, the adsorption amount and soil pollution control will be higher for both adsorbent clays than if our fluid has NaCl salinity. The study's findings have a wide range of applications in surfactant flooding designs, surfactant adsorption optimization, and can be generalized to other detergent types.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"10 3","pages":"Pages 527-538"},"PeriodicalIF":4.2,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S240565612300038X/pdfft?md5=87c8181fb60bf4bc2b4db44900d62f0e&pid=1-s2.0-S240565612300038X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76561696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porosity enhancement potential through dolomitization of carbonate reservoirs, a case of study from the Euphrates Graben fields, East Syria","authors":"Yousef Ibrahem ,&nbsp;Morozov V.P. ,&nbsp;Mohammad El Kadi ,&nbsp;Abdullah Alaa","doi":"10.1016/j.petlm.2021.05.005","DOIUrl":"https://doi.org/10.1016/j.petlm.2021.05.005","url":null,"abstract":"<div><p>The dolostones and dolomitic limestones of the lower Cretaceous Judea formation are a key target of hydrocarbons in most of the Euphrates Graben fields. Core materials investigation, thin sections petrographically examinations, and petrophysical evaluations were obtained to determine enhancement of the porosity through dolomitization. Results showed that the lagoon-shallow marine carbonates of the Judea formation are subdivided into two main zones; the upper “limestone zone” is micritic limestones dominated with no reservoir potential, and the lower “dolomite zone” is dolomitic limestones and dolostones dominated with good to very good reservoir potential. Dolomitization of the mudstones and wackestones of the micritic limestones resulted in formation of microcrystalline dolomicrite and early fabric destructive dolomites. Conversely, dolomitization of the packstones and grainstones resulted in formation of the fabric destructive and saddle dolomites. Based on petrography data, dolomitization of the “limestone zone” is interpreted by the seawater dolomitization mechanism at low-temperatures, while dolomitization of the “dolomite zone” is interpreted by the burial dolomitization mechanism under high temperature and pressure conditions. The “limestone zone” is characterized by the poorest reservoir quality, while the “dolomite zone” is characterized by the best reservoir quality. The seawater dolomitization did not significantly enhance the porosity, while the burial dolomitization contributes to enhancing the preserved secondary porosity. Stylolites microfractures and dissolution seams associated with dolomitization played as major factors in porosity enhancement of the dolostones and dolomitic limestones and serving as pathways for hydrocarbon migration. Dissolution processes increased the porosity and more permeability unless they are filled with the precipitated dolomite and/or calcite. Calcification had significant effects on the porosity by blocking the cavities and channels and decreased the effective pore volume.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 2","pages":"Pages 183-198"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.petlm.2021.05.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49868813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of research on intelligent diagnosis of oil transfer pump malfunction","authors":"Liangliang Dong ,&nbsp;Qian Xiao ,&nbsp;Yanjie Jia ,&nbsp;Tianhai Fang","doi":"10.1016/j.petlm.2022.01.002","DOIUrl":"https://doi.org/10.1016/j.petlm.2022.01.002","url":null,"abstract":"<div><p>Oil transfer pump is the key dynamic equipment in the process of oil and gas gathering and transportation, and its working reliability directly affects the safety of oil and gas storage and transportation. Intelligent diagnosis is a key technical method to reduce failure rate of oil transfer pump, ensure the safety of gathering and transportation process, and avoid major safety accidents caused by oil transfer pump failure. Various oil transfer pumps have been emerged in recent decades, and the common fault types and characteristics of oil transfer pump have been brought out in the review. This article highlights on the research of the fault signal and processing methods of oil transfer pump. Firstly, the fault signal of the oil transfer pump is discussed and the advantages and disadvantages of different signal extraction are analyzed. Secondly, the intelligent diagnosis method of oil transfer pump and the shortcomings of the existing methods are pointed out. Finally, the conclusions are given and the future development perspectives of oil transfer pumps are suggested. The main contribution of this review is to give a syn-thetic understanding on oil transfer pumps.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 2","pages":"Pages 135-142"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49868370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flow characteristic of polymer solutions in porous media: Influence of the molecular weight and concentration","authors":"Yingjie Dai ,&nbsp;Jia Li ,&nbsp;Li Li ,&nbsp;Yifei Liu ,&nbsp;Yuan Li ,&nbsp;Xiangyu Wang ,&nbsp;Xuguang Song ,&nbsp;Caili Dai ,&nbsp;Bin Yuan","doi":"10.1016/j.petlm.2023.03.002","DOIUrl":"https://doi.org/10.1016/j.petlm.2023.03.002","url":null,"abstract":"<div><p>The polymer solution flow in porous media is a central research topic related to hydraulic fracturing measures, formation damage and fracture propagation. Influenced by molecular weights and concentrations, various flow patterns of polymer in pores are presented, resulting in different filtration loss. In this work, the effectiveness of various polymer solutions for filtration loss was assessed by utilizing the core flooding experiment firstly. The result shows that lesser filtration loss normally is inextricably linked to solutions with high molecular weight and concentration. Subsequently, the flow behaviors of polymer solutions investigated by designed micro pore-throat structure and micro-particle image velocimetry (μ-PIV) further confirmed the above result. It was found that the central convergent flow pattern benefiting from higher viscous force loss and less filtration loss was observed at high flow rates (0.5 mL/h), and higher molecular weight and concentration were more prone to convergent flow patterns. The viscosity force loss increases by about 4 times varying the molecular weight of polymer from 5 × 10⁶ to 18 × 10⁶ g/mol or the concentration from 0.05 to 0.3%. It interprets higher molecular weight and concentration in core studies and field observations with decreased filtration loss of HPAM. This work provides a theoretical foundation for the application of fracturing fluids as well as fresh perspectives on how to access the filtration loss of fracturing fluids.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 2","pages":"Pages 214-222"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49868373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A data-driven approach to estimating post-discovery parameters of unexplored oilfields","authors":"Fransiscus Pratikto ,&nbsp;Sapto Indratno ,&nbsp;Kadarsah Suryadi ,&nbsp;Djoko Santoso","doi":"10.1016/j.petlm.2022.10.001","DOIUrl":"https://doi.org/10.1016/j.petlm.2022.10.001","url":null,"abstract":"<div><p>Consider a typical situation where an investor is considering acquiring an unexplored oilfield. The oilfield has undergone a preliminary geological and geophysical study in which pre-discovery data such as lithology, depth, depositional system, diagenetic overprint, structural compartmentalization, and trap type are available. In this situation, investors usually estimate production rates using a volumetric approach. A more accurate estimation of production rates can be obtained using analytical methods, which require additional data such as net pay, porosity, oil formation volume factor, permeability, viscosity, and pressure. We call these data post-discovery parameters because they are only available after discovery through exploration drilling. A data-driven approach to estimating post-discovery parameters of an unexplored oilfield is developed based on its pre-discovery data by learning from proven reservoir data. Using the Gaussian mixture model, and a data-driven reservoir typology based on the joint probability distribution of post-discovery parameters is established. We came up with 12 reservoir types. Subsequently, an artificial neural network classification model with the resilient backpropagation algorithm is used to find relationships between pre-discovery data and reservoir types. Based on k-fold cross-validation with k = 10, the accuracy of the classification model is stable with an average of 87.9%. With our approach, an investor considering acquiring an unexplored oilfield can classify the oilfield's reservoir into a particular type and estimate its post-discovery parameters' joint probability distribution. The investor can incorporate this information into a valuation model to calculate the production rates more accurately, estimate the oilfield's value and risk, and make an informed acquisition decision accordingly.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 2","pages":"Pages 285-300"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49868399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}