下扬子黄桥地区构造特征及其与油气的关系

J4 ›› 2015, Vol. 21 ›› Issue (3): 538-.

下扬子黄桥地区构造特征及其与油气的关系

沈淑鑫，李一泉，崔键，苑京文，贾东*

出版日期:2015-09-20 发布日期:2015-10-20

TheStructuralCharacteristicsinHuangqiaoAreaintheLower YangtzeRegionandItsRelationshiptoOilandGasAccumulation

SHEN Shuxin, LI Yiquan, CUI Jian,YUAN Jingwen, JIA Dong*

Online:2015-09-20 Published:2015-10-20

摘要/Abstract

摘要：

下扬子黄桥地区位于下扬子对冲构造带上，记录了多期构造变形，并且保存了较完整的中古生界海相地层，发育多套烃源岩，具有良好的油气前景。文中采用三维地震工区构造精细解释及运动学正演模拟方法，分析了研究区的构造变形特征及其变形过程，结果表明黄桥地区中上古生界和下中生界地层在自SE向NW的挤压应力作用下，以前展式发育了多个断层相关褶皱构造。在构造前锋，断层相关褶皱反向发育，于工区中部偏北西侧形成明显的对冲构造，地层遭受强烈的褶皱、隆升，构造总缩短率高于47.55%；之后，区域应力场转变为NW—SE向拉张，工区南东侧发育负反转断层，且自南西向北东负反转程度逐渐变大，由上正下逆复合型转变为似正断层型；此次拉伸正断作用导致断层回滑，形成上白垩统填充的半地堑构造，对冲构造也受到了一定的破坏。在此基础上，结合前人油气成藏的研究成果，探讨了黄桥构造变形与其油气成藏的关系，并提出了对冲构造背斜、对冲构造下盘及南东侧的广陵构造背斜为黄桥地区的有利油气区块。研究结果对进一步认识黄桥及下扬子区的构造变形特征和演化、以及该区的油气勘探提供一定的参考。

关键词: 黄桥地区；地震剖面；构造特征；负反转；正演模拟；油气勘探

Abstract:

Huangqiao area is situated at the ramp zone in the Lower Yangtze region, which was subjected to multi-staged tectonic deformation events, and preserves complete Mesozoic-Paleozoic marine sediments, which contain multiple sets of source rocks, with fine prospects of petroleum exploration. Based on the detailed structural interpretations of the 3-D seismic profiles in Huangqiao work area and forward kinematic modeling, this paper analyzes its structural deformation characteristics and the deformation processes. The middle-upper Paleozoic and lower Mesozoic strata developed several fault-related folds by forward propagation, then formed the fault-related folding in the opposite direction in the structural front under the effect of the SE-NW regional stress in the Huangqiao area, which shaped the face to face verging structures at the middle and northwest of Huangqiao area and resulted in the strong uplift and denudation. The total structural shortening rate exceeds 47.55% on the regional cross section in this study. Then the regional stress transferred to NW-SE-trending extension, as a result of which there developed some negative inversion faults in the southeast of the work area and the inversion amount increased from the southwest to the northeast of the work area. This extensional event led to the fault back-slip, forming the half grabens which were filled with the upper Cretaceous strata, and causing some damages to the face-to-face structures. Combining previous research achievements of hydrocarbon accumulation, this paper discusses the Huangqiao structural deformation and its relationship to the oil and gas accumulation, and proposes the anticline at face to face verging structure, its footwall and the anticlinal Guangling structure in the southeast of Huangqiao area as the favorable oil and gas blocks. Therefore, the study of the structure in Huangqiao region, can not only help better understand the deformation characteristics and evolution history of Huangqiao structure, but also provide clues for the oil-gas exploration and development.

Key words: Huangqiaoarea;seismicprofiles;structuralcharacteristics;inversionstructure;forwardmodeling;oilandgasexploration

沈淑鑫，李一泉，崔键，苑京文，贾东* . 下扬子黄桥地区构造特征及其与油气的关系[J]. J4, 2015, 21(3): 538-.

SHEN Shuxin, LI Yiquan, CUI Jian,YUAN Jingwen, JIA Dong*. TheStructuralCharacteristicsinHuangqiaoAreaintheLower YangtzeRegionandItsRelationshiptoOilandGasAccumulation[J]. J4, 2015, 21(3): 538-.