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Study on crustal thickness and the prediction of prolific depressions:the Bohai Basin as an example

Acta Oceanologica Sinica 2024年第4期43卷 92-104页

作者： Mengke Cai Gongcheng Zhang Wanyin Wang Dingding Wang College of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054China China National Offshore Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China Key Laboratory of Marine Geology and Environment Chinese Academy of SciencesQingdao 266071China National Engineering Research Center of Offshore Oil and Gas Exploration Beijing 100028China Department of Earth Environment and Resources SciencesUniversity of Naples FedericoⅡNaples 80138Italy

The deep crustal structure is closely related to oil and gas *** the oil and gas enrichment of depressions based on the Moho depth and crustal thickness is a promising research topic with significant implications for guiding exploration in petroliferous *** this study,seismic data were used as a constraint on the use of satellite gravity anomaly inversion to obtain the distribution of Moho depth and crustal thickness in the Bohai *** factors were calculated to analyze the differential distribution of deep crustal structural *** indicators,including the minimum Moho depth,minimum crustal thickness,sum of Moho stretching factors,and sum of crustal stretching factors,were *** component analysis was applied to reduce the dimensionality of the multi-indicator system and obtain an oil and gas enrichment score for quantitative prediction of favorable prolific *** deviation between the inverted Moho depth and seismic constraints was small;thus,the data effectively reflect the variations in the characteristics of each *** analysis revealed significant statistical features related to the minimum Moho depth/crustal thickness and the sum of Moho/crustal stretching factors associated with prolific *** on the oil and gas enrichment score,the depressions were classified into four categories related to their different deep crustal structural *** active ClassⅠ,ClassⅡ,and ClassⅢdepressions are predicted to be favorable prolific *** study expands the research on quantitatively predicting favorable prolific depressions in the Bohai Basin using the deep crustal structure and can contribute to reducing production costs and improving exploration efficiency in future explorations.

关键词： Bohai Basin satellite gravity anomaly deep crustal structure Moho depth crustal thickness favorable prolific depression

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