地质学报2025，Vol.99Issue(5)：1554-1575,22.DOI:10.19762/j.cnki.dizhixuebao.2024352
渤海湾盆地断裂与莫霍面对油气富集海陆差异性的影响
The influence of faults and the Moho interface on the differential hydrocarbon accumulation between marine and terrestrial areas in the Bohai Bay basin
摘要
Abstract
The Bohai Bay basin is a principal contributor to oil and gas production not only in offshore China but also on a global scale,with its hydrocarbon resource distribution exhibiting marked differences between marine and terrestrial areas,a pattern intimately linked to the basin's crustal structure.In order to clarify the crustal structure of the Bohai Bay basin,this study leveraged terrain and gravity data to reveal the distribution of basin faults and the fluctuations of the Moho interface.NVDR-THDR technology and Euler deconvolution were utilized to ascertain the planar locations of the faults and their apparent depth distributions.Minimum curvature technique for potential field data separation and the fast solution of forward and inverse problems for gravity fields in a dual interface model were applied to obtain the fluctuations in the Moho interface.The investigation uncovered significant contrasts between marine and terrestrial areas regarding both fault distribution and Moho characteristics:marine areas feature faults trending in both NNE—NE and WNW—NW directions,whereas terrestrial regions predominantly exhibit NNE—NE trending faults.Compared to terrestrial settings,marine faults tend to be shallower and show more intense late-stage activity.Sags in marine areas display shallower average Moho depths,thinner crustal thicknesses,and higher mean values for the sum of Moho stretching factors and crustal stretching factors relative to terrestrial sags.These findings indicate that marine areas have experienced greater tectonic deformation,creating favorable conditions for the formation of hydrocarbon-prone zones and hydrocarbon migration and accumulation.Conversely,terrestrial environments present less advantageous conditions,directly impacting the differential distribution of hydrocarbon enrichment within the basin.Consequently,the spatial distribution hydrocarbon resources in the Bohai Bay basin is tightly connected to the distribution of faults and fluctuations of the Moho interface.This research furnishes a scientific foundation for guiding further oil and gas exploration efforts in the basin.关键词
渤海湾盆地/断裂/莫霍面深度/地壳厚度/油气聚集/海陆差异Key words
Bohai Bay basin/fault/Moho depth/crustal thickness/hydrocarbon accumulation/marine and terrestrial differences引用本文复制引用
蔡梦轲,王万银,张义蜜,王丁丁..渤海湾盆地断裂与莫霍面对油气富集海陆差异性的影响[J].地质学报,2025,99(5):1554-1575,22.基金项目
本文为中海石油有限公司科技项目"中国近海盆地潜在富油凹陷资源潜力、成藏机制与突破方向"课题"中国近海潜在富油凹陷深部构造差异性研究"和海洋油气勘探国家工程研究中心2022年开放基金课题(编号CCL2022RCPS0794RQN)联合资助的成果. （编号CCL2022RCPS0794RQN）
