川西坳陷中段上三叠统须家河组致密气藏超压特征与组合类型划分  

Overpressure characteristics and classification of the tight gas reservoirs in upper Triassic Xujiahe formation in the middle section of west Sichuan Depression,China

作　　者：李林涛[1,2] 邓克[1,2] 张建华[1,2] 

机构地区：[1]油气资源与探测国家重点实验室中国石油大学,北京102249 [2]盆地与油藏研究中心中国石油大学,北京102249

出　　处：《特种油气藏》2010年第3期19-21,30,共4页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划“973”项目“中国西部叠合盆地油气藏分布规律与有利区预测”(2006CB202308)

摘　　要：上三叠统须家河组为川西坳陷主要产气层段,须家河组气藏具备超致密和超压两大特点。川西坳陷中段已发现的气藏均集中在正向构造单元上,主要产气构造的压力测试与钻井、测井资料反映的压力特征表明:须家河组不同层段超压发育特征不同,压力系数总体上盖层段大于储层段、须家河组上段大于须家河组下段。不同气藏具有不同的纵向超压发育特征,根据典型气藏须家河组压力发育特征,将川西坳陷中段须家河组气藏划分为新场型、合兴场型、鸭子河型和大邑型4种压力组合类型,其分别代表了不同程度的压力和油气保存状态,具有不同的勘探意义。The upper Triassic Xujiahe formation is the main gas production interval in west Sichuan Depression,has two main characteristics of ultra-tight and overpressure.Most of the gas reservoirs are found in the positive tectonic units in the middle section of west Sichuan Depression.Pressure tests result and drilling and logging data have shown that the overpressure character differs in different intervals of Xujiahe formation;the pressure coefficient is higher in the cap rock than in the reservoirs,and higher in the upper Xujiahe formation than in the lower.Different gas reservoirs have different vertical overpressure characteristics.The Xujiahe gas reservoirs in the middle section of west Sichuan Depression are classified into 4 pressure associations according to typical pressure development characteristics,i.e.Xinchang type,Hexingchang type,Yazihe type and Dayi type,which respectively represent different levels of pressure and hydrocarbon preservation conditions,and have different implications in gas exploration.

关 键 词：川西坳陷 须家河组 致密气藏 超压 组合类型 勘探意义 

分 类 号：TE122.3[石油与天然气工程—油气勘探]