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Evaluation of the viability of nanoparticles in drilling fluids as additive for fluid loss and wellbore stability 评价钻井液中纳米颗粒作为降滤失剂和井眼稳定性添加剂的可行性
Petroleum Pub Date : 2023-09-01 DOI: 10.1016/j.petlm.2023.02.005
Albertus Retnanto , Rommel Yrac , Abdullah Shaat , Adhika Retnanto , Laith Abughaush , Maha Al Sulaiti , Najla Badar
{"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 (Al<sub>2</sub>O<sub>3</sub>) 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 Al<sub>2</sub>O<sub>3</sub> 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, Al<sub>2</sub>O<sub>3</sub> was less effective under HTHP conditions when compared to LTLP conditions. Al<sub>2</sub>O<sub>3</sub> 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}
引用次数: 3
Approach for C1 to C2 products commencing from carbon dioxide: A brief review 从二氧化碳开始生产 C1 到 C2 产品的方法:简要回顾
IF 4.2
Petroleum Pub Date : 2023-07-19 DOI: 10.1016/j.petlm.2023.07.002
{"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 (CO<sub>2</sub>) 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 CO<sub>2</sub> by employing appropriate photo-, thermal- and electro-catalysts in order to produce different one carbon atom (C<sub>1</sub>) and higher carbon atoms containing products. Besides, the utilization of clean and sustainable CO<sub>2</sub> 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 CO<sub>2</sub> 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 (C<sub>2</sub>) atoms containing products perceived in the chemical reduction of CO<sub>2</sub>. The author hopes that this piece of work will be helpful to researchers and readers who are focused on the field of CO<sub>2</sub>.</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}
引用次数: 0
On how water injection may induce fault reactivation and slippage? A numerical method 注水如何诱发断层再活化和滑动?数值方法
Petroleum Pub Date : 2023-07-01 DOI: 10.1016/j.petlm.2023.07.003
Hao Yu, Yuheng Tuo, Tiejun Lin, Min Li, Zhanghua Lian
{"title":"On how water injection may induce fault reactivation and slippage? A numerical method","authors":"Hao Yu, Yuheng Tuo, Tiejun Lin, Min Li, Zhanghua Lian","doi":"10.1016/j.petlm.2023.07.003","DOIUrl":"https://doi.org/10.1016/j.petlm.2023.07.003","url":null,"abstract":"","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81186181","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}
引用次数: 0
Experimental investigation of surfactant adsorption during EOR and soil pollution control processes: Influence of surfactant concentration, water salinity, and clay type EOR 和土壤污染控制过程中表面活性剂吸附的实验研究:表面活性剂浓度、水盐度和粘土类型的影响
IF 4.2
Petroleum Pub Date : 2023-06-13 DOI: 10.1016/j.petlm.2023.06.003
{"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 MgCl<sub>2</sub>), 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 MgCl<sub>2</sub> 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}
引用次数: 0
Active control of the fluid pulse based on the FxLMS 基于FxLMS的流体脉冲主动控制
Petroleum Pub Date : 2023-06-01 DOI: 10.1016/j.petlm.2023.06.006
Hai Yang, Jie Liu, Zexing Yang, Haibo Liang, Lizao Zhang, Jialing Zou
{"title":"Active control of the fluid pulse based on the FxLMS","authors":"Hai Yang, Jie Liu, Zexing Yang, Haibo Liang, Lizao Zhang, Jialing Zou","doi":"10.1016/j.petlm.2023.06.006","DOIUrl":"https://doi.org/10.1016/j.petlm.2023.06.006","url":null,"abstract":"","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76105032","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}
引用次数: 0
Porosity enhancement potential through dolomitization of carbonate reservoirs, a case of study from the Euphrates Graben fields, East Syria 碳酸盐岩储层白云化提高孔隙度的潜力——以叙利亚东部幼发拉底河地堑地区为例
Petroleum Pub Date : 2023-06-01 DOI: 10.1016/j.petlm.2021.05.005
Yousef Ibrahem , Morozov V.P. , Mohammad El Kadi , Abdullah Alaa
{"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}
引用次数: 5
Review of research on intelligent diagnosis of oil transfer pump malfunction 油泵故障智能诊断研究综述
Petroleum Pub Date : 2023-06-01 DOI: 10.1016/j.petlm.2022.01.002
Liangliang Dong , Qian Xiao , Yanjie Jia , Tianhai Fang
{"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}
引用次数: 4
Flow characteristic of polymer solutions in porous media: Influence of the molecular weight and concentration 聚合物溶液在多孔介质中的流动特性:分子量和浓度的影响
Petroleum Pub Date : 2023-06-01 DOI: 10.1016/j.petlm.2023.03.002
Yingjie Dai , Jia Li , Li Li , Yifei Liu , Yuan Li , Xiangyu Wang , Xuguang Song , Caili Dai , Bin Yuan
{"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 × 10<sup>6</sup> to 18 × 10<sup>6</sup> 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}
引用次数: 0
A data-driven approach to estimating post-discovery parameters of unexplored oilfields 一种数据驱动的方法估算未勘探油田发现后的参数
Petroleum Pub Date : 2023-06-01 DOI: 10.1016/j.petlm.2022.10.001
Fransiscus Pratikto , Sapto Indratno , Kadarsah Suryadi , Djoko Santoso
{"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}
引用次数: 0
Formation evaluation and rock type classification of Asmari Formation based on petrophysical- petrographic data: A case study in one of super fields in Iran southwest 基于岩石物理岩相资料的Asmari组地层评价与岩石类型划分——以伊朗西南某超级油田为例
Petroleum Pub Date : 2023-06-01 DOI: 10.1016/j.petlm.2022.01.009
Raeza Mirzaee Mahmoodabadi , Sadegh Zahiri
{"title":"Formation evaluation and rock type classification of Asmari Formation based on petrophysical- petrographic data: A case study in one of super fields in Iran southwest","authors":"Raeza Mirzaee Mahmoodabadi ,&nbsp;Sadegh Zahiri","doi":"10.1016/j.petlm.2022.01.009","DOIUrl":"https://doi.org/10.1016/j.petlm.2022.01.009","url":null,"abstract":"<div><p>The Oligo-Miocene Asmari Formation is one of the most important hydrocarbon reservoirs in the Middle East. The oilfield under study is one of the largest oilfields in the Zagros basin with the Asmari Formation being the major reservoir rock. In this study, petrographic analyses, petrophysical data and neural network clustering techniques were used for identifying rock types in the Asmari reservoir. Facies analysis of the Asmari Formation in the study area has resulted in the definition of 1 clastic lithofacies and 14 carbonate microfacies types. Using petrophysical logs from 43 wells and their correlation with capillary pressure (<em>P<sub>c</sub></em>) curves, led to the recognition of 7 electrofacies (EF1-EF7). Microscopic evidence of Electrofacies group C1 and S1 show that the sedimentary facies of these electrofacies are most commonly found in restricted and shoal facies belts zone. Also, petrographic studies show that the sedimentary facies of C2, C3, C4, S2 and S3 were formed in the open marine, Lagoon, and Tidal flat facies belt zone of homoclinal ramp sedimentary environment during the Oligo-Miocene based on relative sea level changes respectively. The link between electrofacies and geological data indicated that both sedimentary and diagenetic processes controlled the reservoir quality of the Asmari Formation. Porosity, permeability and water saturation were used to estimate the reservoir quality of each electrofacies. EFs 1 and 2 with high porosity and permeability, low water saturation is considered as the best reservoir with regard to sedimentary textures (dolowackestone and dolograinstone) and the effect of diagenetic processes such as dolomitization processes. Vuggy, growth framework and interparticle porosities are major in EF-2, while the intercrystalline porosity is the major type in EF-1. EFs 3 and 4 show low values of porosity, permeability and high percentage of water saturations, which characterizes them as poor reservoir rocks. Finally, EF-5 is the only electrofacies in the siliciclastic parts of the Asmari reservoir, which is composed of rounded and well-sorted quartz grains that are slightly cemented. In sandstone electrofacies, electrofacies EF- 5 (S1), is the best type of sandstone reservoir rock and to move towards electrofacies EF-7 (S3), will reduce reservoir quality. In carbonate electrofacies, also, electrofacies no 1, the best type of carbonate reservoir rock can be observed and move towards electrofacie number 4, lower quality of reservoir rocks is seen.</p></div>","PeriodicalId":37433,"journal":{"name":"Petroleum","volume":"9 2","pages":"Pages 143-165"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49868814","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}
引用次数: 2
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