严锐涛,徐怀民,严锐锋,曾联波,何永宏

• 1:中国石油大学(北京)地球科学学院
• 2:中国石油长庆油田分公司第三采气厂
• 3:中国石油长庆油田分公司勘探开发研究院

摘要(Abstract)：

为揭示鄂尔多斯盆地环江油田延长组长8段致密砂岩储层特征及控制因素,通过岩心、薄片鉴定、扫描电镜、X衍射等资料研究了储层的岩石学特征、成岩作用、孔隙和物性特征,并讨论了致密砂岩的成因机理。结果表明:长8段岩石类型主要为长石岩屑砂岩和岩屑长石砂岩,储集空间主要为粒间孔(包括残余粒间孔与粒间溶孔)、溶孔(长石溶孔与岩屑溶孔),储层孔隙度平均为9.6%;渗透率平均为0.67×10~(-3)μm~2。为典型的低孔——超低孔、超低渗的致密储层。储层物性受控于多种因素,其中沉积条件是不同砂岩物性差异的基础,沉积后持续快速的埋藏和较多的塑形颗粒共同导致强烈的压实和孔隙的大量损失,硅质和钙质胶结则充填压实剩余孔隙,加之伊利石对孔吼的堵塞,最终形成致密砂岩。

关键词(KeyWords)： 环江油田;延长组;致密砂岩;成岩作用;主控因素

Abstract:

Keywords:

基金项目(Foundation): 国家重大科技专项“岩性地层油气藏成藏规律;; 关键技术及目标评价”项目(2011ZX05001)资助~~

作者(Author): 严锐涛,徐怀民,严锐锋,曾联波,何永宏

DOI: 10.16441/j.cnki.hdxb.20150131

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