印度河盆地T区块构造特征与油气成藏

发布时间：2018-06-05 11:39

本文选题：构造演化 + 扭张性断裂　；参考：《石油地球物理勘探》2017年06期

【摘要】：依据大量的地震剖面解释及地质综合分析成果,探讨了印度河盆地T区块区域构造演化特征,总结了研究区扭张性断裂构造组合样式和有利圈闭类型,进一步讨论了构造运动与油气成藏的关系,得出以下认识。(1)盆地演化主要经历了基底期、侏罗纪裂谷期、白垩纪斜向拉张断陷期和古近纪以来的板块碰撞及构造反转等演化阶段。多期次构造运动导致研究区断裂系统发育,构造内幕破碎。(2)由于白垩纪印巴板块的漂移、旋转和分离,导致了强烈的斜向拉张作用,形成了总体上垒堑相间、局部断块复杂化的构造格局,并于白垩纪末期基本定型。结合白垩系扭张性断裂构造样式分析,识别了6类平面、7类剖面的典型组合样式。(3)T区块具备优越的油气成藏条件,构造运动促进生油岩的成熟和排烃;扭张性断裂构造样式组合形成了多种圈闭类型,包括断块、断鼻、断背斜和构造—岩性复合圈闭等;深大断裂沟通了油源和圈闭,提供油气运移通道,利于油气成藏,扭张性断裂活动与源岩排烃和圈闭形成期构成良好的匹配关系。最后在构造特征和油气成藏分析的基础上指出了有利油气勘探区带。
[Abstract]:Based on a large number of seismic section interpretation and geological comprehensive analysis results, the regional tectonic evolution characteristics of block T in the Indus Basin are discussed, and the structural assemblage patterns and favorable trap types of torsional tensional faults in the study area are summarized. The relationship between tectonic movement and hydrocarbon accumulation is further discussed. It is concluded that the evolution of the basin mainly experienced basement stage and Jurassic rift period. Cretaceous oblique extensional fault depression and plate collision and tectonic inversion since Paleogene. Because of the drift, rotation and separation of the Cretaceous India-Pakistan plate, this resulted in a strong diagonal extensional action, which resulted in the formation of the overall upper barrier graben phase. The complicated tectonic pattern of local fault blocks was basically fixed in the late Cretaceous. Based on the analysis of the tectonic style of the Cretaceous torsional tensional faults, the typical combination styles of the six types of plane and seven types of sections, the block of Yusanyitt, have superior oil and gas reservoir forming conditions, and the tectonic movement promotes the maturation and expulsion of hydrocarbon from the source rocks. The structural pattern assemblage of torsional fracture formed many types of traps, including fault block, fault nose, fault back slope and tectonic-lithologic complex trap, etc. Deep and large faults communicate oil source and trap, provide oil and gas migration channel, and facilitate oil and gas accumulation. The torsional tensional fault activity has a good matching relationship with hydrocarbon expulsion and trap formation of the source rock. Finally, on the basis of structural characteristics and hydrocarbon accumulation analysis, the favorable oil and gas exploration zones are pointed out.
【作者单位】：油气资源与勘探技术教育部重点实验室(长江大学);东方地球物理公司研究院;长江大学地球物理与石油资源学院;
【基金】：“十三·五”国家专项“川西源内成藏体系成藏机理研究”(2016ZX05002-004-009)资助
【分类号】：P618.13

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