Pub Date : 2023-11-30DOI: 10.1007/s11001-023-09531-2
Regina Usbeck, M. Dillon, N. Kaul, A. Lohrberg, F. Nehring, A. C. Ploetz
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 (< 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.
{"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 (< 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":"26 24","pages":""},"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}
Pub Date : 2023-11-29DOI: 10.1007/s11001-023-09533-0
Satya Narayan, Soumyashree Debasis Sahoo, S. K. Pal, L. T. Pham, Pradeep Kumar
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% & error: 414 m/s*g/cm3), while the multi-layer perceptron algorithm was applied to predict gamma-ray (correlation: 90.5% & error: ~ 2.5API), neutron porosity (correlation: 92.3% & error: ~ 0.01) and effective porosity (correlation: 85.8% & 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.
{"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% & error: 414 m/s*g/cm<sup>3</sup>), while the multi-layer perceptron algorithm was applied to predict gamma-ray (correlation: 90.5% & error: ~ 2.5API), neutron porosity (correlation: 92.3% & error: ~ 0.01) and effective porosity (correlation: 85.8% & 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":"31 28","pages":""},"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}
Pub Date : 2023-11-11DOI: 10.1007/s11001-023-09530-3
Ahmed Shalaby, Mohammad Abdelfattah Sarhan
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.
{"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":"34 20","pages":"0"},"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}
Pub Date : 2023-10-13DOI: 10.1007/s11001-023-09529-w
Emily Jackson, Heather Bedle, Thang Ha
{"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":"271 1","pages":"0"},"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}
Pub Date : 2023-10-04DOI: 10.1007/s11001-023-09528-x
Jiliang Wang, Benjun Ma, Luanxiao Zhao, Pibo Su, Shiguo Wu
{"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":"49 1","pages":"0"},"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}
Pub Date : 2023-08-31DOI: 10.1007/s11001-023-09527-y
Mo Zhou, Feng Wu
{"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":"80 1","pages":""},"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}
Pub Date : 2023-05-25DOI: 10.1007/s11001-023-09523-2
N. G. Maduna, M. Manzi, J. Bourdeau, Z. Jinnah
{"title":"3D reflection seismic imaging of natural gas/fluid escape features in the deep-water Orange Basin of South Africa","authors":"N. G. Maduna, M. Manzi, J. Bourdeau, Z. Jinnah","doi":"10.1007/s11001-023-09523-2","DOIUrl":"https://doi.org/10.1007/s11001-023-09523-2","url":null,"abstract":"","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":"48 1","pages":"1-28"},"PeriodicalIF":1.4,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81293007","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}
Pub Date : 2023-05-16DOI: 10.1007/s11001-023-09522-3
B. Yi, N. Kang, Seok-Hwi Hong, So-ra Kim, Jiyoung Choi, D. Yoo
{"title":"Characterization of weak layers in the Southwestern slope of Ulleung Basin with seismic data merging and inversion","authors":"B. Yi, N. Kang, Seok-Hwi Hong, So-ra Kim, Jiyoung Choi, D. Yoo","doi":"10.1007/s11001-023-09522-3","DOIUrl":"https://doi.org/10.1007/s11001-023-09522-3","url":null,"abstract":"","PeriodicalId":49882,"journal":{"name":"Marine Geophysical Research","volume":"122 1","pages":"1-14"},"PeriodicalIF":1.4,"publicationDate":"2023-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76740321","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}
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