鄂尔多斯盆地延安地区致密砂岩气藏“甜点”储层主控因素分析Major Controlling Factor of Tight Sandstone Gas Sweat Reservoir in Yan′an Area of Ordos Basin
杨希濮;孙卫;
摘要(Abstract)：
通过物性分析、薄片分析、扫描电镜、压汞、核磁共振等多种方法相结合,对鄂尔多斯盆地延安地区致密砂岩气藏的孔隙结构进行了微观、定量分析。结果表明:山二段储层孔隙结构明显优于盒八段,山二段以粒间孔和溶孔为主,占总孔隙的77%,喉道较大,平均喉道半径为0.6μm,孔喉连通性较好;盒八段晶间孔相对较多,占总孔隙的32%,喉道较小,平均喉道半径为0.3μm,连通性较差。在此基础上对"甜点"储层主控因素进行了分析,研究表明:沉积与成岩作用的耦合是"甜点"储层的主控因素,主导储层空间展布和孔隙演化;沉积优势相带中,石英等刚性矿物含量高、填隙物含量少,导致储层在成岩过程中压实、胶结、杂质蚀变等破坏性作用减弱,溶蚀等建设性作用增强,促使孔隙结构向有利方向演化。
关键词(KeyWords)： 致密砂岩气藏;孔隙结构特征;二叠系;山二段;盒八段
基金项目(Foundation): 国家科技支撑计划项目“低(超低)渗透油田高效增产改造和提高采收率技术与产业化示范”(2007BAB17B00)
作者(Author): 杨希濮;孙卫;
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DOI:
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