摘要
鄂尔多斯盆地延长组广泛发育致密油藏。以致密油储集层的岩石学特征、物性及微观孔喉结构特征等测试分析结果为基础,对致密储层影响因素进行了分析。研究认为长6油层组岩石类型主要为中一细粒岩屑质长石砂岩,胶结类型主要为接触式胶结和接触一孔隙式胶结,物性总体较差,粒间残余孔、粒内溶蚀孔较发育,以微一细喉道为主,属低孔一特低渗储层;成岩早期的压实作用和中后期伊利石的胶结作用是造成储集层物性较差的主要原因,成岩中后期的溶蚀作用使储集层的物性得到一定改善。
Tight oil reservoirs are widely developed in Yanchang Formation of Ordos Basin. On the bases of the tested and analyzed results of the petrological characteristics, physical properties and micro-pore-throat structure properties and so on of the tight oil reservoirs, the influencing factors of the reservoirs are figured out. The studies show that the main rock type of Oil Group Chang-6 is medium-fine grain lithic arkose and the cementation type is mainly contact and contact-hole cemented, the physical properties are relatively poor in general, the intergranular residual and intragranular dissolved pores that take micro-fine throat as the principal forms are well developed, which belongs to low-porosity and extra-low-permeability reservoirs; the compaction in the early stage of diagenesis and the illite cementation in the intermediate and late periods are the key reasons for rather poorer physical proper- ties of the reservoirs, fortunately the dissolution in the medium and late stages of the diagenisis has improved the properties to a certain degree.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2013年第5期165-169,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重点基础研究发展计划(2009CB219300)
关键词
致密油
鄂尔多斯盆地
延长组
储层特征
成岩作用
tight oil
Ordos Basin
Yanchang Formation
reservoir characteristic
diagenesis
作者简介
郭馨蔚，女，1989年生，在读硕士，从事石油地质方面研究。E—mail：xinwei．grace@gmail．com
