川中上三叠统须四段地下水动力场演化的油气意义  

Evolution of hydrodynamic fields in the 4th Member of Upper Triassic Xujiahe Formation in Central Sichuan and its petroleum significance

作　　者：王威[1] 徐国盛[2] 雍自权[2] 宋焕荣[2] 黄尚瑜[2] 

机构地区：[1]中国石化勘探南方分公司 [2]成都理工大学油气藏地质及开发工程国家重点实验室

出　　处：《石油勘探与开发》2010年第5期633-640,共8页Petroleum Exploration and Development

基　　金：国家重点基础研究发展规划(973)项目"中国典型叠合盆地深部流体与浅部流体相互作用及其成藏效应"(G1999043309)

摘　　要：通过对川中地区须家河组须四段各个水文地质旋回古水动力场的恢复,进而预测油气运移聚集位置。研究表明,古水文地质条件是控制油气藏形成的流体运移网络的决定性因素,古水动力场是油气成生聚散的重要媒介和驱动力。油气初次运移和二次运移的最终走向与归宿,均与地下水径流系统密切相关。沉积压释承压水流对川中地区油气运聚的影响最大。通过研究,在须四段储集层划分出晚三叠世、早侏罗世、中侏罗世—第四纪等3个水文地质旋回和相应的水文地质阶段。第1水文地质阶段,水动力场主要影响地下水运移、聚散和空间分布;第2水文地质阶段是川中地区油气运移成藏的最有利时机,地下水流作为油气载体和驱动力,携带烃类气体向低势区转移,并在适当地区分异、聚集成藏。Ancient hydrodynamic fields in hydogeologic cycles were restored to predict the locations of the migration and accumulation of oil and gas.Ancient hydrogeological conditions are the decisive factor in the network migration of fluids which controlled the formation of reservoirs.Ancient hydrodynamic fields are the important media and driving force of the formation,accumulation,loss of oil and gas.In both the initial migration and secondary migration,the ultimate destination of oil and gas is closely related to groundwater flow systems.Confined water affects most on oil and gas migration in the region.The Xu 4 Member reservoirs are divided into three hydrogeologic cycles,Late Triassic,Early Jurassic,and Middle Jurassic-Quaternary,and the corresponding hydrogeologic stages.In the first stage,hydrodynamic fields impact on the migration,accumulation and distribution of groundwater.The second stage is the most favorable opportunity for oil and gas migration in the region into accumulations,ground water carries and drives hydrocarbon to the low potential areas where they differentiate and accumulate.

关 键 词：水动力场 沉积压释承压水 水文地质旋回 须四段 川中地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]