岩性油气藏 ›› 2023, Vol. 35 ›› Issue (2): 8093.doi: 10.12108/yxyqc.20230208
肖玲1,2, 陈曦1,2, 雷宁1,2, 易涛3, 郭文杰4
XIAO Ling1,2, CHEN Xi1,2, LEI Ning1,2, YI Tao3, GUO Wenjie4
摘要: 鄂尔多斯盆地合水地区是长庆油田页岩油勘探开发的重点区块。根据铸体薄片、物性分析、扫描电镜、高压压汞及核磁共振等测试分析结果,对鄂尔多斯盆地合水地区三叠系长7段页岩油储层特征及其主控因素进行了研究。研究结果表明: ①合水地区长7段页岩油储层主要为一套灰黑—黑色细—粉砂岩,以岩屑长石砂岩为主,填隙物的体积分数平均为16.71%。岩石物性较差,平均孔隙度为8.15%,平均渗透率为0.102 mD,为超低孔—特低孔、超低渗型储层。②研究区孔隙类型以长石溶孔和残余粒间孔为主,以亚微米孔(直径为0.1~1.0 μm)含量最多,占总孔隙数量的75.56%,纳米孔隙(直径小于0.1 μm)数量次之,占总孔隙数量的17.94%。孔喉类型较复杂,溶蚀成因的管束状喉道及压实成因的片状、弯片状喉道为储层主要的喉道类型。③沉积作用、成岩作用及构造作用共同控制了研究区长7段页岩油储层的质量和分布。沉积作用为储层提供了物质基础,储层主要形成于深水重力流沉积环境,可分为砂质碎屑流砂体和浊流砂体等2种类型。中等—强压实强度的压实作用和胶结作用降低了储层物性,溶蚀作用对于改善储层物性具有一定的积极作用,构造作用形成的裂缝提高了储层的渗流能力,并对后期的储层压裂改造具有重要意义。
中图分类号:
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