川西坳陷北部断褶带中二叠统异常流体压力分布特征及成因分析  

Distribution characteristics and genetic analysis of the abnormal fluid pressure in the middle Permian in the northern fault-fold zone of the western Sichuan Depression

作　　者：刘雯 邱楠生[4,5] 马寅生[1,2,3] 徐秋晨 LIU Wen;QIU Nansheng;MA Yinsheng;XU Qiuchen(Key Laboratory of Paleomagnetism and Tectonic Reconstruction,Ministry of Natural Resources,Beijing 100081,China;Key Laboratory of Petroleum Geomechanics,China Geological Survey,Beijing 100081,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;School of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Oil and Gas Resources Survey,China Geological Survey,Beijing 100083,China)

机构地区：[1]自然资源部古地磁与古构造重建重点实验室,北京100081 [2]中国地质调查局油气地质力学重点实验室,北京100081 [3]中国地质科学院地质力学研究所,北京100081 [4]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [5]中国石油大学(北京)地球科学学院,北京102249 [6]中国地质调查局油气资源调查中心,北京100083

出　　处：《地质力学学报》2020年第6期911-922,共12页Journal of Geomechanics

基　　金：国家自然科学基金项目(4183000106);中国地质科学院基本科研业务费项目(JYYWF20181201)。

摘　　要：含油气盆地中温压场的研究是探明油气成藏机理的核心问题,特别是古压力的恢复对研究油气的运移、聚集甚至储层的成岩、烃类的生成都起着至关重要的作用。文中以现今地层压力为约束,应用盆地模拟法恢复了川西北断褶带中二叠统的压力演化过程,并利用构造挤压应力模型定量分析超压主控因素。恢复结果显示,川西北中二叠统则发育两期超压,特别是侏罗纪—早白垩世末,受构造挤压应力作用超压快速累积,且不同构造单元受挤压应力的影响差别较大。近造山带发育弱超压,晚白垩世之后恢复至常压;远离造山带的褶皱带和前渊带则发育超压—强超压,且受侧向挤压应力的影响,构造抬升后仍然保持超压—强超压的状态。The temperature and pressure field is the key point for studying on the mechanism of hydrocarbon accumulation in the petroliferous basin,and the reconstruction of paleo-pressure particularly plays an important role in the study of hydrocarbon migration and accumulation,and even diagenesis in reservoirs and hydrocarbon generation for source rocks.In this paper,with pressure distribution as constraint,the paleo-pressures in the middle Permian of the northwestern Sichuan Basin were reconstructed by adopting basin modeling.In the northwest fault-fold belt of the Sichuan Basin two stages of overpressure developed,in the middle Permian,especially from the late Jurassic to the end of early Cretaceous.The overpressure accumulated rapidly in reservoirs under the effect of compressive stress which varied greatly in different structural units.The weak overpressure developed near the orogenic belt,which recovered to normal pressure after the late Cretaceous;but the strong overpressure developed in the fold and foredeep zone far from the orogenic belt even after the structure uplift,which was mainly controlled by the external compressive stress from northwest.

关 键 词：川西北断褶带 海相盆地 古流体压力 超压成因 挤压应力 

分 类 号：TE122.[石油与天然气工程—油气勘探]