鄂尔多斯盆地苏里格气田低压形成的控制因素  

Controlling factors of underpressure reservoirs in the Sulige gas field,Ordos Basin

作　　者：许浩[1,2] 张君峰 汤达祯[1,2] 李明[4] 张文忠[5] 林文姬[1,2] 

机构地区：[1]中国地质大学(北京)能源学院 [2]海相储层演化与油气富集机理教育部重点实验室 [3]中国石油勘探与生产公司 [4]中国石油勘探开发研究院 [5]中联煤层气有限责任公司

出　　处：《石油勘探与开发》2012年第1期64-68,共5页Petroleum Exploration and Development

基　　金：国家自然科学基金青年项目(40802027);中国石油天然气股份有限公司风险创新基金项目(0706d01040102);中央高校基本科研业务费专项资金(2011YXL052)

摘　　要：基于气田低压分布特征研究,从构造演化、沉积特征、地层流体性质等方面深入剖析鄂尔多斯盆地苏里格气田低压形成的主控因素。苏里格气田气藏压力主要为低压且受埋深影响较大,气藏顶底板发育多层欠压实泥岩,具有很好的物性和压力封闭条件,地层水特征亦反映气藏封闭条件好。苏里格气田地层压力经历了晚三叠世—早侏罗世正常压力状态、中侏罗世—晚侏罗世压力整体上升、早白垩世压力持续增大并达到最高及早白垩世晚期以来气藏压力逐渐降低的演化过程,最终形成低压。早白垩世晚期以来的构造抬升剥蚀作用导致苏里格气田储集层孔隙反弹增大和孔隙流体降温收缩,从而使得气藏压力降低,分别降低了0.673 MPa和原始地层压力的23.08%。苏里格气藏低压的形成是沉积配置、构造演化及油气成藏等多种因素作用的结果。Based on the study of low-pressure distribution characteristics,the main factors that control the formation of low-pressure reservoirs in the Sulige gas field are analyzed from several aspects,such as structural evolution,sedimentary characteristics and formation fluid features.It is suggested that the gas pool pressure is low and affected greatly by buried depth.Its roof and floor developed several layers of uncompacted mudstone,indicative of good property and pressure sealing conditions.The formation water also indicates favorable preservation conditions.The reservoir pressure of the Sulige gas field experienced 4 major evolutionary stages： the normal pressure stage of the late Triassic？early Jurassic,the pressure rising stage of the middle Jurassic？late Jurassic,the sustainable pressure increasing stage of the early Cretaceous,and the pressure decreasing stage of the late early-Cretaceous.The pore rebound and temperature decrease caused by intense tectonic uplift after the late period of early Cretaceous,caused the reservoir pressure of the Sulige gas field to reduce by 0.673 MPa and 23.08% of the original strata pressure,respectively.The low pressure of the Sulige gas field is related to sedimentary assemblage,tectonic evolution and hydrocarbon accumulation.

关 键 词：低压气藏 形成机制 构造抬升 苏里格气田 鄂尔多斯盆地 

分 类 号：TE122.12[石油与天然气工程—油气勘探]