宜川-旬邑地区长8油层组储层特征与控制因素  

ANALYSIS ON CONTROLLING FACTORS OF RESERVOIR CHARACTERISTIC OF THE CHANG 8 MEMBER IN THE YICHUAN-XUNYI AREAS,ORDOS BASIN

作　　者：田亚铭 施泽进[2] 吴晓明[3] 宋江海[4] 齐亚林[4] 高翔 洪成云[2] 

机构地区：[1]成都理工大地球科学学院,四川成都610059 [2]成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都610059 [3]长庆油田公司第七采油厂,陕西西安710021 [4]长庆油田公司勘探开发研究院,陕西西安710021 [5]中国石油集团长城钻探工程有限公司录井公司,辽宁盘锦124010

出　　处：《新疆地质》2011年第3期314-318,共5页Xinjiang Geology

基　　金：国家自然科学基金委员会重点基金资助项目(40739903)项目资助

摘　　要：宜川-旬邑地区上三叠统延长组长8油层组主要为三角洲前缘沉积环境,局部发育湖底滑塌扇体.岩心观察、薄片分析、扫描电镜及压汞测试表明,长8油层组主要为长石岩屑砂岩和岩屑长石砂岩,孔隙类型以残余原生粒间孔为主,次为长石溶孔,多为片状喉道和弯片状喉道,孔隙结构以小孔隙-微喉-细喉型与细孔隙-微喉-细喉型为主,储层非均质性强,水下分流河道、河口坝储层物性最好,分支水道最差,绿泥石环边胶结成岩相及石英次生加大胶结成岩相为有利成岩相,压实和胶结作用分别损失的孔隙度为25.65%和3.31%,溶蚀作用整体新增0.83%孔隙度,形成长8油层组目前低孔-超低孔致密砂岩储层.The Cenozonic chang 8 formation are mostly deltafront sedemation environment, besides the partly sublake-fan , in the Yichuan-Xunyi areas on the southeast margin of Ords basin. Based on bore core＇s and slice＇s observing and accounting, and analysis of scanning electron microscope and pressure Hg analysis , it is found that sandstones of chang 8 member are mostly feldspar detritus sandstone and detritus feldspar sandstone. The residual protozoal intergranular pore and the dissolution pore are the main pore type with the poor pore structure. The property of the reservoir are affected by material , facies and diagenesis. The subdistributary channel and mouth bar have beteer property, and the property of branch channel is worse. For the compaction and cementation action , which reduce the 25.65%,and 3.31%,besides that, the dissolution action ,which increased the 0.84% ,which forming the present low porosity - low tight sandstone reservoir.

关 键 词：鄂尔多斯 储层特征 孔隙结构 控制因素 延长组 

分 类 号：P618.13[天文地球—矿床学]