摘要
塔木察格盆地是断陷型盆地,盆地内断裂较发育,断裂及不整合面勾通生油岩和圈闭,作为油气运移优势通道,有利于油气的运聚和成藏。塔南凹陷位于海拉尔-塔木察格盆地中部断陷带的南部,塔南凹陷铜钵庙组是油气勘探的主要目的层之一,现已有55口井获得工业油流,层内砂体较发育,储层较厚。本文通过岩心分析、铸体薄片分析、电镜扫描等方法,分别对储层的岩石学特征、孔隙类型、物性特征进行了研究,并分别从沉积、成岩作用、构造作用等几个方面研究了影响储层物性的控制因素。研究成果表明,塔南凹陷铜钵庙组储层主要由碎屑岩组成,其次为火山碎屑岩。通过对铜钵庙组59口井压汞资料的分析研究,将喉道类型分为较细喉-中孔道、较细喉-小孔道、较细喉-特小孔道,细喉-特小孔道、微细喉-特小孔道5种类型,储集空间主要为次生孔隙,其次为原生孔隙,铜钵庙组储层孔隙结构总体较差,属中低孔隙度、特低渗透率储层。储层物性的控制因素主要为沉积环境和成岩作用和构造作用。扇三角洲内前缘储层物性最好,导致储层物性变差的因素主要为压实作用和胶结作用,溶蚀作用使储层物性变好。
Tamsag Basin is faulted basin.The Basin formed complex rift system .The formations of the faults and unconformable surface,with well-colluded with source rock and traps,create good conditions for forming various types of reservoir.The South Tamtsag Depression is located at the south of Tamsag Basin,The Tongbomiao formation of the Tamtsag Depression is the main oil layer,which contains well sand body,keeps thicker reservoir,Fault and unconformity surface collude with oil source rocks and trapes,as preferential migration pathways,which contribute to hydrocarbon migration and accumulation.This paper,adopting many scientific means,Such as the core analysis、Casting thin-section analysis、electronic microscope scanning,respectively lithologic properties,pore types and physical properties were researched.we also study the factors which can influence the physical properties of reservoir through deposition、diagenesis and tectonization.The conclusion shows that the reservoir is made up clastic rock,the second is athrodenic rock in Tongtimiao formation;The throat is divided into five types:prep small throat and medium pore throat、prep small throat and fine pore、prep small throat and special fine pore、 prep small throat and fine pore、microscopic small throat and special fine pore.The main accumulate type is secondary pore,with the development of some primary pores;the pore structure of reservoir in Tongbomiao formation is poor,its reservoir belongs to low-mid permeability and specially low porosity.The properties of the reservoir are mainly affected by depositional environment and diagenesis.physical property of inner frontier of fan delta is superlative,compaction and carbonate cementation can make physical property of reservoir become poor;denudation can make reservoir property become well.
出处
《内蒙古石油化工》
CAS
2011年第6期167-170,共4页
Inner Mongolia Petrochemical Industry
关键词
塔南凹陷
铜钵庙组
储层物性特征
控制因素
The South Tamtsag Depression
The Tongbomiao formation
The physical property of reservoir
Controlling factor
