CAJ | 학술논문

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。
하양자황교지구위우하양자대충구조대상，기록료다기구조변형，병차보존료교완정적중고생계해상지층，발육다투경원암，구유량호적유기전경。문중채용삼유지진공구구조정세해석급운동학정연모의방법，분석료연구구적구조변형특정급기변형과정，결과표명황교지구중상고생계화하중생계지층재자SE향NW적제압응력작용하，이전전식발육료다개단층상관습추구조。재구조전봉，단층상관습추반향발육，우공구중부편북서측형성명현적대충구조，지층조수강렬적습추、륭승，구조총축단솔고우47.55%；지후，구역응력장전변위NW—SE향랍장，공구남동측발육부반전단층，차자남서향북동부반전정도축점변대，유상정하역복합형전변위사정단층형；차차랍신정단작용도치단층회활，형성상백성통전충적반지참구조，대충구조야수도료일정적파배。재차기출상，결합전인유기성장적연구성과，탐토료황교구조변형여기유기성장적관계，병제출료대충구조배사、대충구조하반급남동측적엄릉구조배사위황교지구적유리유기구괴。연구결과대진일보인식황교급하양자구적구조변형특정화연화、이급해구적유기감탐제공일정적삼고。
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.