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Formation pressure evolution and its causes for the reservoirs of the upper Triassic Xujiahe formation in the northeast portion of the Sichuan basin, China
Energy Exploration & Exploitation ( IF 2.7 ) Pub Date : 2021-04-23 , DOI: 10.1177/01445987211012484
Cunjian Zhang 1, 2, 3 , Jingdong Liu 1, 2, 3 , Youlu Jiang 1, 2, 3
Affiliation  

Overpressure is one of the most important factors for oil and gas charging in petroliferous basins. Research on overpressure evolution and its formation mechanisms is of great significance for predicting formation pressures in oil and gas reservoirs before drilling. However, research methods addressing overpressure evolution are not without issues. Based on the measured formation pressures and fluid inclusions, the evolution of the formation pressures in the Xujiahe Formation in the northeast part of the Sichuan Basin was investigated by PVT and basin simulations and the causes of overpressure were also analyzed. The results show that overpressure in the continental strata began to develop at the bottom of the Middle Jurassic Shaximiao Formation. The pressure coefficients of the Upper Triassic Xujiahe Formation range from 1.01 to 1.90, and belong to the normal pressure and overpressure regimes. The present-day overpressure of the Xujiahe Formation is mainly caused by hydrocarbon generation and tectonic compression. The tight reservoirs are conducive to the formation and preservation of overpressure. The pressures in the Xujiahe Formation experienced two evolution processes, namely an “increase-decrease-increase” (eastern area) process and an “increase-decrease” (western area) process. Overpressure began to develop in the Middle Jurassic(J2) period. Due to the hydrocarbon generation taking place, the formation pressures increased rapidly from the Middle Jurassic(J2) period to the early Late Cretaceous (the early part of K2) period. The degree of development of overpressure in the western part of the study area was greater than that in the eastern part of the study during the critical charging period (J3–K1). Since the early Late Cretaceous, the formation pressure has gradually decreased due to tectonic uplift and erosion. From the Oligocene (E3) period to the present, the formation pressures have increased again in local areas due to tectonic compression.



中文翻译:

四川盆地东北部上三叠统须家河组储层地层压力演化及其成因

超压是含油盆地中油气充注的最重要因素之一。对超压演化及其形成机理的研究对预测钻井前油气藏的地层压力具有重要意义。但是,解决超压演变的研究方法并非没有问题。基于测得的地层压力和流体包裹体,通过PVT技术研究了四川盆地东北部徐家河组地层压力的演化,并进行了盆地模拟,分析了超压的成因。结果表明,陆相地层超压在中侏罗统沙溪庙组底部开始形成。上三叠统须家河组的压力系数范围为1.01至1.90,属于常压和超压状态。现今的徐家河组超压主要是由于生烃和构造压缩所致。致密的储层有利于超压的形成和保持。徐家河组的压力经历了两个演化过程,即“增减”过程(东部地区)和“增减”(西部地区)过程。中侏罗纪开始超压(J 即“增加-减少-增加”(东部地区)过程和“增加-减少”(西部地区)过程。中侏罗纪开始超压(J 即“增加-减少-增加”(东部地区)过程和“增加-减少”(西部地区)过程。中侏罗纪开始超压(J2)期间。由于发生了生烃作用,地层压力从侏罗纪中期(J 2)到白垩纪晚期(K 2早期)开始迅速增加。在临界充电期间(J 3 –K 1),研究区西部的超压发展程度大于研究东部的超压发展程度。自白垩纪晚期以来,由于构造隆升和侵蚀,地层压力逐渐降低。从渐新世(E 3)时期至今,由于构造压缩,局部区域的地层压力再次增加。

更新日期:2021-04-24
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