石油实验地质2024，Vol.46Issue(1)：54-63,10.DOI:10.11781/sysydz202401054
江汉盆地江陵凹陷复兴场背斜盐构造特征与成因
Characteristics and genetic mechanism of salt structure in Fuxingchang anticline,Jiangling Sag,Jianghan Basin
摘要
Abstract
The Fuxingchang salt anticline is an important oil-bearing structure in the Jiangling Sag of the Jiang-han Basin,while its structural evolution and formation mechanism are unclear,which restricts the delicate explo-ration of oil and gas.Therefore,the analysis of structural evolution and formation mechanism of the Fuxingchang salt anticline is not only helpful to understand the influence of salt bed flow under different stress backgrounds on the formation and evolution of the anticline,but also important to understand the process of petroleum accumula-tion.The structural characteristics and genetic mechanism of Fuxingchang anticline were studied by analyzing 3D seismic data and combining with the techniques of balance restoration of key structural layers and growth strata analysis.The results show that the Fuxingchang anticline is a salt anticline with significant structural features that vary along strike,resulting from multiple stages of fault reconstruction and complex deformation mechanisms.The anticline was initially formed during normal faulting in the sedimentary period from Early Eocene Xingouzui Formation to the early period of Late Eocene,which formed roller fold and caused the accumulation of salt layer.From the late period of Late Eocene to Oligocene,the differential loading of sedimentary strata drove salt beds to flow from west to east,resulting in the westward dip of the whole structure and the formation of monoclinal struc-ture,which was uplifted and denudated in the late period of Oligocene.The anticline was finalized from Neogene to Quaternary,and evolved into a compressional salt anticline,associated with reverse faults and kink-band structures.The formation and evolution of Fuxingchang anticline are influenced by the combined effects of regional stress background,salt layer of Shashi Formation,the east-dipping normal faults,sub-salt paleostructures,etc.The structural trap formed by Fuxingchang salt anticline occurred slightly earlier than the main oil expulsion period of source rocks,and during the main oil expulsion period,the structure was in the depression stage,with weak fault activity,which was conducive to the early accumulation of trapped oil and gas.关键词
构造平衡恢复/演化特征/成因机制/复兴场背斜/江陵凹陷/江汉盆地Key words
balanced restoration technique/evolution characteristics/formation mechanics/Fuxingchang anti-cline/Jiangling Sag/Jianghan Basin分类
能源科技引用本文复制引用
邱建华,彭金宁,唐玮,潘文蕾,李风勋,杨帆..江汉盆地江陵凹陷复兴场背斜盐构造特征与成因[J].石油实验地质,2024,46(1):54-63,10.基金项目
中国石化科技部项目"中扬子地区天然气勘探潜力及突破方向"(P0613)资助. （P0613）
