摘要
在鄂尔多斯盆地东部高家堡三维地震勘探区,新近研究发现了伴有断裂的背斜构造。在该盆地内部这类规模较大的背斜构造并不多见,因而以往研究薄弱。高家堡背斜构造与区内断裂在时空位置及成因上关系密切,且对奥陶系盐下天然气成藏和分布有重要影响。利用该区高精度三维地震、钻测井和周邻地区二维地震资料,综合分析已有区域地质构造成果和测试结果,研究了该背斜及其伴生断裂的构造特征,探讨了背斜构造的形成时限和成因模式及其与油气赋存—成藏的关系。研究结果认为:高家堡背斜长轴近南北向,呈东陡西缓不对称样式,自奥陶系马三段至地表下中侏罗统均具有完整背斜形态,各层系的隆起幅度和宽度相当,背斜内外层厚度变化不明显。断裂主要在背斜构造带部位发育、成因相关,属褶皱相关断裂。背斜构造形成于135~125 Ma的早白垩世早期,是在东高西低的区域背景下,受构造事件触发,上覆巨厚地层沿奥陶系马三段膏盐岩层发生层间滑动,在奥陶系—寒武系先成南北向断裂发育处受阻、膏盐岩层聚集增厚上拱而形成的底辟式背斜,具晚期一期形成的变形特点。高家堡背斜构造为油气聚集成藏的有利部位,褶皱相关断层的发育促使地层储集性能的改善和上下层系之间的连通,有利于油气在较多的层系聚集成藏。研究成果既丰富了盆地构造研究内容,也深化了对研究区油气赋存成藏的认知,为下一步油气勘探提供了新的思路。
In the Gaojiapu 3D seismic exploration area in the eastern part of the Ordos Basin,recent research has discovered anticline structures accompanied by faults.Such large-scale anticlinal structures are rare in this ba‐sin,so the previous research is weak.The Gaojiapu anticlinal structure is closely related to the faults in the re‐gion in terms of temporal and spatial location and genesis,and has an important influence on the accumulation and distribution of Ordovician subsalt natural gas.The Gaojiapu anticline structure is closely related to the spa‐tial and temporal location and genesis of faults in the area,and has a significant impact on the formation and dis‐tribution of natural gas reservoirs under the Ordovician salt system.This article uses high-precision 3D seismic,drilling and logging data,as well as 2D seismic data from neighboring areas,to comprehensively analyze exist‐ing regional geological structure achievements and test results,study the structural characteristics of the anti‐cline and its associated faults,explore the formation time limit and genetic model of the anticline structure,and its relationship with oil and gas occurrence and accumulation.This study holds that:The long axis of the Gaoji‐apu anticline runs in a nearly north-south direction,showing an east steep and west gentle asymmetric style.From the Ma 3 Member of the Ordovician to the Early and Middle Jurassic strata on the surface,it has a com‐plete anticline shape.The uplift amplitude and width of each layer series are equivalent,and there is no signifi‐cant change in the thickness of the inner and outer layers of the anticline.The faults are mainly developed in the anticlinal tectonic belt and related in origin,belonging to folding related faults.The anticline structure was formed in the early Cretaceous period between 135 and 125 Ma.It is a diapiric anticline formed in an area with high altitude in the east and low altitude in the west,triggered by tectonic events.The overlying thick strata slide between layers alon
作者
刘卫帅
刘池洋
周义军
黄雷
刘永涛
于小伟
陈平
李维
LIU Weishuai;LIU Chiyang;ZHOU Yijun;HUANG Lei;LIU Yongtao;YU Xiaowei;CHEN Ping;LI Wei(State Key Laboratory of Continental Dynamics,Northwest University,Xi′an 710069,China;Institute of Oil and Gas Basin,Northwestern University,Xi′an 710069,China;Changqing Branch,Research Institute of Oriental Geophysical Company,Xi'an 710021,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2024年第10期1800-1815,共16页
Natural Gas Geoscience
基金
国家自然科学基金项目(编号:42230815,42272148,41330315,41972153,41173060,42172123,42072170)
西北大学大陆动力学国家重点实验室科技部专项(编号:201210142)联合资助。
关键词
鄂尔多斯盆地东部
高家堡三维地震区
底辟式背斜
褶皱相关断裂
膏盐岩层
The eastern part of the Ordos Basin
Gaojiapu 3D seismic exploration area
Diapiric anticline
Fold related faults
Gypsum salt layers
