吉木萨尔凹陷芦草沟组致密油储层溶蚀孔隙特征及成因机理

发布时间：2018-02-01 12:22

本文关键词： 致密油储层溶蚀孔隙成因机理芦草沟组吉木萨尔凹陷　出处：《岩性油气藏》2017年03期 　论文类型：期刊论文

【摘要】：针对吉木萨尔凹陷芦草沟组致密油储层溶蚀孔隙较发育,但控制因素及成因机理认识程度低的问题,利用岩心、铸体薄片和扫描电镜观察以及物性测试等方法,结合矿物成分、油气成藏演化和成岩演化等分析,对研究区孔隙类型及特征、溶蚀孔隙成因机理及分布规律进行了研究。结果表明:吉木萨尔凹陷芦草沟组致密油陆源碎屑岩、内源沉积岩及火山碎屑岩3种岩石类型储层中均发育有溶蚀孔隙,其形成受内部和外部因素共同制约,有机酸溶蚀长石类及碳酸盐岩类等易溶矿物组分是其形成的主要方式;芦草沟组二段中部的岩屑长石粉细砂岩储层溶蚀孔隙发育程度高、物性好、厚度相对较大、平面分布较为稳定,是下一步致密油勘探开发的重点层位。
[Abstract]:In view of the problem that the dissolution porosity of dense oil reservoir of Lucaogou formation in Jimusar sag is relatively developed, but the controlling factors and genetic mechanism are low, the methods of core, casting sheet, scanning electron microscope and physical property testing are used. Combined with mineral composition, oil and gas accumulation evolution and diagenetic evolution, the pore types and characteristics in the study area are analyzed. The formation mechanism and distribution of dissolved pores are studied. The results show that the Lucaogou formation of Jimusar sag is a compact continental clastic rock. Dissolution pores are developed in the three types of rock reservoirs of internal sedimentary rocks and pyroclastic rocks, and their formation is restricted by both internal and external factors. Soluble mineral components such as organic acid dissolution feldspar and carbonate rock are the main forms of formation. The lithic feldspar siltstone fine sandstone reservoir in the middle part of the second member of the Lucaogou formation has high dissolution porosity, good physical properties, relatively large thickness and stable plane distribution, which is the key horizon for the exploration and development of compact oil in the next step.
【作者单位】：中国石油勘探开发研究院;中国石油新疆油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计划(973计划)项目“陆相致密油甜点成因机制与精细表征”(编号:2015CB250901)资助
【分类号】：P618.13
【正文快照】： 0引言近10年来,国内外致密油勘探开发均取得了重要进展,致密油已成为非常规石油中最现实的勘探开发领域[1-4]。国外在致密油储层微观孔隙结构研究方面起步较早,开发了多种微观测试技术和方法,并形成了新的理论体系,而国内的相关研究才刚刚起步[5]。溶蚀孔隙作为致密油储层中重

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