Marine Geophysical Research最新文献

{"title":"Integrated thin layer classification and reservoir characterization using sparse layer reflectivity inversion and radial basis function neural network: a case study","authors":"","doi":"10.1007/s11001-023-09537-w","DOIUrl":"https://doi.org/10.1007/s11001-023-09537-w","url":null,"abstract":"<h3>Abstract</h3> <p>Understanding subterranean reservoirs, geological characteristics, fluid composition, and hydrocarbon potential strongly relies on precise reservoir characterization. Seismic inversion is a key method in reservoir characterization to approximate the acoustic impedance and porosity of underlying rock formations using seismic and well-log data. A sparse layer reflectivity (SLR) post-stack inversion method approach is used in this study to make thin layers more visible. To generate an impedance volume, it uses a predetermined wavelet library, an objective function, and a regularization parameter, the regularization parameter is a tunable parameter used to control the balance between fitting the data closely (minimizing the misfit) and ensuring a smooth and stable model for and sparseness computed coefficients. This study uses Blackfoot data to estimate the density, velocity, impedance, and porosity of a particular region using the SLR and Radial Basis Function Neural Network (RBFNN). According to the interpretation of the impedance section, a low impedance anomaly zone with an impedance range of (8500–9000) m/s*g/cc is present at a time of (1040–1065) ms. The low impedance zone is classified as a clastic glauconitic sand channel (reservoir zone) based on the correlation between seismic and borehole data. Further, a Radial Basis Function Neural Network (RBFNN) has been applied to the data to estimate porosity volume and to conduct a more thorough examination of the reservoir zone and cross-validate inverted results. The research demonstrates that the high porosity zone, low velocity, and density zone are discovered by the RBFNN technique, and the low impedance zone interpreted in inversion findings are correlating, which confirms the existence of the glauconitic sand channel. This research is crucial for understanding how well SLR, RBFNN, and multi-attribute analysis work to define sand channels.</p>","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrocarbon migration and structural reservoir traps in the Western Black Sea Basin: evidence from satellite-derived gravity tensor data","authors":"","doi":"10.1007/s11001-023-09535-y","DOIUrl":"https://doi.org/10.1007/s11001-023-09535-y","url":null,"abstract":"<h3>Abstract</h3> <p>The Black Sea, situated between Türkiye, Bulgaria, Romania, Ukraine, and Russia, is tectonically separated into two different sub-basins: Eastern and Western Black Sea. These two sub-basins have been a target of interest for oil and gas exploration for several decades. Although the participation of the Black Sea Basin in the global oil market is very small compared to the Caspian Sea, this basin is considered a potential hydrocarbon deposit since both areas have similar characteristics in terms of source rock. In this study, satellite-derived Bouguer and free-air gravity data were interpreted to disclose the prospective hydrocarbon reservoirs and gas hydrate deposits within the Western Black Sea Basin. The locations of the maxima identified in the <em>I</em>_<em>2</em> invariants map were assessed as five substantial hydrocarbon prospective zones three of which are in the Turkish Exclusive Economic Zone. Numerous oil and gas seeps are evidence of lateral and vertical hydrocarbon migration from the source rock through major faults in the WBSB where the maximum <em>I</em>_<em>2</em> anomalies are observed.</p>","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139498465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance assessment of GEBCO_2023 gridded bathymetric data in selected shallow waters of Indian ocean using the seafloor from ICESat-2 photons","authors":"D. Giribabu, Rohit Hari, J. Sharma, Koushik Ghosh, Niyati Padiyar, Aryan Sharma, A. Bera, Sushil Kumar Srivastav","doi":"10.1007/s11001-023-09534-z","DOIUrl":"https://doi.org/10.1007/s11001-023-09534-z","url":null,"abstract":"","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139438604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shallow seismic imaging of sub-seafloor structures off the subsiding area of Linbian estuary in Pingtung, SW Taiwan: implications for recent tectonic activities and focused fluid migrations","authors":"Sutieng Ho, Andreas Wetzel, Sebastian Wege","doi":"10.1007/s11001-023-09532-1","DOIUrl":"https://doi.org/10.1007/s11001-023-09532-1","url":null,"abstract":"<p>Recently, subsidence at the coast of Pingtung alluvial plain (SW Taiwan) considerably accelerated, mainly caused by excessive groundwater exploitation from shallow aquifers. To better understand the subsidence pattern and groundwater flow, investigating the structural setting of the Pingtung Basin is essential. The present investigation has revealed that the shallow-marine region off the most rapidly subsiding area of Linbian estuary and Dapeng Bay is characterised by extensive fault and fracture networks, along with a buried syncline, as evidenced by the seismic records. Nearshore, seismic records reveal tectonic fault blocks situated only a few meters beneath the modern seafloor, within the upper 200 m of the seafloor sediments corresponding to the upper interval of the syncline’s infill. This syncline has the same width as the Pingtung basin on land and likely represents its marine extension. Seaward of the most rapidly subsiding area, namely the Linbian estuary, a depression developed on the modern seafloor by both sagging above the syncline centre towards the western flank and extensional faults, which are indicative of recent sinking (= reactivation) of the syncline underneath. The faults, the submarine depression and the coastal subsidence are primarily manifest above the western flank and the centre of the syncline, possibly due to asymmetric reactivation prograding from the syncline's centre towards its western flank. The western flank is intersected by the Liuchu Hsu mud-diapir ridge, which started to rise further and thus, likely triggered the formation of a series of extensional faults above the syncline, followed by minor fault inversions. Previous studies have described freshwater leakage from land aquifers to the seafloor near the subsiding area and at the locations of faults. In fact, these aquifers extend to the adjacent seafloor. Furthermore, faults and fractures in the sub-seafloor deposits in vicinity to the subsiding land areas likely act as conduits in two ways: (1) saline water can infiltrate into the aquifers or (2) freshwater flows out of them. Therefore, these conduits facilitate flow of water from land towards the sea and vice versa. Consequently, the human-induced groundwater overdraft at the Pingtung coast represents a primary factor, which causes seawater to intrude inland whereas tectonic subsidence of the Pingtung Basin is of subordinate importance. The extensive fault and fracture networks, however, have the potential to amplify seawater intrusion inland or seaward freshwater leakage by providing pathways, as highlighted by this study results.</p>","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138563337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High variability and exceptionally low thermal conductivities in nearshore sediments: a case study from the Eckernförde Bay","authors":"Regina Usbeck, M. Dillon, N. Kaul, A. Lohrberg, F. Nehring, A. C. Ploetz","doi":"10.1007/s11001-023-09531-2","DOIUrl":"https://doi.org/10.1007/s11001-023-09531-2","url":null,"abstract":"<p>Heat flow measurements are a standard technique in Geophysics both onshore and offshore. Recently, such measurements became increasingly important in shallow waters. The increasing amount of offshore power installations makes it necessary to have a good knowledge about the subsurface heat flow and the thermal properties of the sediments to optimize the construction of the necessary powerlines. While the thermal properties are well studied for deep ocean sediments, only few published data exist for nearshore sediments. In this study, we investigate the sediment temperatures and thermal conductivities of nearshore sediments in the German part of the Baltic Sea. The shallow sediment temperatures reflect the interplay of the response to the seasonal cycle in connection with the sediments’ thermal conductivity. We find thermal conductivity values ranging from 0.67 to 3.34 W/(m*K) for the sediments down to ~ 4.2 m below seafloor. This variability exceeds that of conservative estimates widely used for coastal sediments and is also much higher than the variability found in the deep oceans. Sandy sediments show thermal conductivities larger than 1 W/(m*K) whereas organic-rich muds have lower values (&lt; 1 W/(m*K)). Furthermore, the thermal conductivities seem to decrease with increasing free gas content in the sediment. The latter needs to be confirmed by further investigations.</p>","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138504890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated geophysical and petrophysical characterization of Upper Jurassic carbonate reservoirs from Penobscot field, Nova Scotia: a case study","authors":"Satya Narayan, Soumyashree Debasis Sahoo, S. K. Pal, L. T. Pham, Pradeep Kumar","doi":"10.1007/s11001-023-09533-0","DOIUrl":"https://doi.org/10.1007/s11001-023-09533-0","url":null,"abstract":"<p>In the recent past, an integrated analysis of predicted petrophysical properties along with acoustic impedance has emerged as an effective means of characterizing reservoirs. Model-based inversion method was applied to precisely estimate acoustic impedance (correlation: 87.9% &amp; error: 414 m/s*g/cm³), while the multi-layer perceptron algorithm was applied to predict gamma-ray (correlation: 90.5% &amp; error: ~ 2.5API), neutron porosity (correlation: 92.3% &amp; error: ~ 0.01) and effective porosity (correlation: 85.8% &amp; error: ~ 0.01) from post-stack 3D seismic data. We analyzed the entire Abenaki Formation into four parts, i.e., the Scatarie, Baccaro, Misaine shale and Artimon Members. These members have been characterized by combining the P-Imp, GR, NPHI, and PHIE responses. Well-based cross-plot study suggests that the high P-Imp, low GR and low NPHI indicate carbonate facies. In contrast, low impedance, high GR and high NPHI values indicate the shale facies from the Abenaki Formation. P-Imp, GR, and NPHI values fall in the intermediate range for the sand facies. The attribute stratal slice maps indicate the dominance of carbonate facies within the Scatarie, Baccaro, and Artimon Members, while shale facies dominate within the Misaine shale Member in the Penobscot field. The carbonate facies' hydrocarbon potentiality within different members was also accessed based on PHIE responses. The Artimon, Baccaro and Scatarie Members observed several high porosity (10–20%) zones. The current study also advocates that the integrated analysis using multi-attributes certainly minimizes the risk associated with facies discrimination in reservoir characterization for hydrocarbon exploration. Other potential prospective zones could be probed to chase the lead from well L-30 in the study area for further exploration-related works.</p>","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138504811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre- and post-Messinian deformational styles along the northern Nile Delta Basin in the framework of the Eastern Mediterranean tectonic evolution","authors":"Ahmed Shalaby, Mohammad Abdelfattah Sarhan","doi":"10.1007/s11001-023-09530-3","DOIUrl":"https://doi.org/10.1007/s11001-023-09530-3","url":null,"abstract":"Abstract The present work is focused on the structural deformation styles of the pre- and post-Messinian sequences of the Nile Delta Basin. The structural interpretations presented in this study shed critical insight about the evolution of the Nile Delta Basin through pre- and post-Messinian times, provides high reliability about its origin and development in the context of the Eastern Mediterranean tectonic history. The explanation for the seismic data covering three different gas fields (Baltim Field, Temsah Field and North Sinai Field) extend along the northern offshore portion of the Nile Delta Basin revealed significant variations in the deformational styles between the pre- and the post-Messinian sequences. The pre-Messinian rocks were mainly compressed in northwest-southeast direction creating folding-related compressional deformations which gradually decline eastward. The post-Messinian sequence exhibits differences in the deformational models between the examined fields. In Baltim field, it shows extensional features caused by the bulk northeast-southwest extensional deformation. However, in Temsah and North Sinai fields, this post-Messinian succession exposes north–south compressional deformation. These interpreted deformational directions are extremely well-matched with the regional structure configuration of the Nile Delta Basin and the eastern Mediterranean regions.","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135042444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of spectral attributes in identifying gas hydrates in seismic data from the Pegasus Basin, offshore New Zealand","authors":"Emily Jackson, Heather Bedle, Thang Ha","doi":"10.1007/s11001-023-09529-w","DOIUrl":"https://doi.org/10.1007/s11001-023-09529-w","url":null,"abstract":"","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135854346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rock physics diagnostics to characterize early diagenetic processes in hemipelagic calcareous ooze in the northern South China Sea margin","authors":"Jiliang Wang, Benjun Ma, Luanxiao Zhao, Pibo Su, Shiguo Wu","doi":"10.1007/s11001-023-09528-x","DOIUrl":"https://doi.org/10.1007/s11001-023-09528-x","url":null,"abstract":"","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135644080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genesis and controlling factors of Cenozoic dolostones in the South China Sea: a case study from core Nanke-1 in the Nansha Islands","authors":"Mo Zhou, Feng Wu","doi":"10.1007/s11001-023-09527-y","DOIUrl":"https://doi.org/10.1007/s11001-023-09527-y","url":null,"abstract":"","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83440468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}