卢杰河;王香增;贺永红;杨超;邓南涛;

• 1:中国科学院地质与地球物理研究所

• 2:中国科学院大学地球科学学院

• 3:陕西延长石油(集团)有限责任公司

摘要(Abstract)：

致密砂岩油是非常规油气勘探的热点领域。以鄂尔多斯盆地东南部富县地区长7油层组为研究对象,利用铸体薄片、扫描电镜、常规物性、X线衍射和稳定同位素等方法,分析致密砂岩的成岩作用,并对孔隙度演化进行半定量恢复。结果表明:长7油层组致密砂岩储层处于中成岩阶段A期,经历机械压实、绿泥石包膜、泥微晶方解石和亮晶方解石胶结、有机酸溶蚀、高岭石及蒙皂石向伊/蒙混层转化、少量微晶石英和石英次生加大等成岩作用。物性演化主要受机械压实、亮晶方解石胶结和有机酸溶蚀等成岩作用影响,但不同成岩作用在不同成岩时期所起作用存在差异。砂岩储层大致经历早成岩阶段A期(T_3—J_1末)、早成岩阶段B期(J_1末—K_1早)、中成岩阶段A期快速埋藏(K_1早—K_2早期)和中成岩阶段A期缓慢抬升等4个孔隙演化阶段,孔隙度从35.0%的原始孔隙度一直演化至现今6.6%。该研究结果对鄂尔多斯盆地东南部富县地区油气勘探有指导意义。

关键词(KeyWords)：致密砂岩;致密油;成岩作用;孔隙演化;长7油层组;富县地区

Abstract:

Keywords:

基金项目(Foundation):国家自然科学基金项目(41372151);; 国家科技重大专项(2011ZX08005-004)

作者(Author):卢杰河;王香增;贺永红;杨超;邓南涛;

Email:

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