摘要
从奥陶系马家沟组马五段古岩溶形成机理出发,通过大量钻井岩芯观察、薄片和扫描电镜鉴定、物性数据分析,研究了大牛地气田马五古岩溶形成机理及对储层的影响。结果表明,马五段古岩溶分为三种类型,在这三种岩溶作用的控制下,导致马五发育白云岩孔隙型、裂缝-孔隙型及裂缝-溶蚀孔洞型三种储层类型。储层的白云化使得储层晶间孔隙以及溶蚀缝-洞发育,溶蚀缝-洞发育为岩溶水提供了通道,岩溶水的渗流进一步加剧了次生孔隙的形成及白云化作用,改善了储层物性,为天然气的富集提供了储集空间。
Based on the formation mechanism of Magugou Formation in Ordovician system,this paper studies the formation mechanism of Magugou formation in Daniudi gas field and its influence on the reservoir through observation of a large number of drilling cores,identification by thin sections and scanning electron microscopy,and analysis of physical property data.The results show that there are three types of ancient karst in Mawu section,and under the control of these three types of karstification,there are three types of dolomite reservoirs in Mawu section,namely,fissure-porosity and fissure-dissolution pores.The dolomization of the reservoir leads to the development of intercrystalline pores and dissolution fissure-cave,which provides channels for karst water.The seepage of karst water further intensifies the formation of secondary pores and dolomization,improves the physical properties of the reservoir,and provides storage space for the enrichment of natural gas.
出处
《内蒙古石油化工》
CAS
2020年第7期110-112,共3页
Inner Mongolia Petrochemical Industry
基金
国家重大专项“大牛地气田稳产及提高采收率技术”2016ZX0548-002-03
效益产建“大牛地气田老区综合调整提高采收率技术研究”2019XYCJ-01
关键词
大牛地
马五段
岩溶作用
白云岩
溶蚀孔洞储层
Daniudi
The five sections
Karstification
Dolomite
Dissolution pore reservoir
作者简介
吴永峰(1985-),男,助理研究员,2009年毕业于西南石油大学资源与环境学院,现从事天然气开发地质研究。
