摘要
为解决昆北油田切12区E13油藏在开发过程中存在的问题,综合利用岩心、薄片、扫描电镜、物性以及压汞分析等资料,对该区储层孔隙结构及物性特征进行了综合研究。结果表明:切12区E13油藏以砾岩沉积为主,粒径较大;储层岩石类型主要为岩屑长石砂岩、长石岩屑砂岩;储层孔隙类型主要为原生粒间孔隙,其次为裂缝(构造缝)以及各类次生孔隙;压汞实验表明该区孔喉半径砾岩最粗,渗透性最好,根据压汞曲线形态可将孔隙结构分为4种类型:粗喉大孔型(Ⅰ)、粗喉小孔型(Ⅱ)、细喉大孔型(Ⅲ)和细喉小孔型(Ⅳ),其中细喉大孔型(Ⅲ)、细喉小孔型(Ⅳ)在区内最发育;研究区储层物性较差,属于低孔特低渗储层,但储层孔渗相关性较好,储层物性受沉积、成岩及构造作用的多重控制。
In order to solve the problems during the development process of the E_3~1 reservoir in the Qie12 block,reservoir pore structure and property characteristics have been comprehensively studied in the area based on the cores,thin sections,SEM,physical properties and mercury intrusion analysis.The study indicates that the area contains conglomerate deposits of coarse particles,and the reservoir rock types are mainly the debris-feldspar and feldspathic lithic sandstone.There are various types of reservoir pores,primarily intergranular pores followed by fractures（structural fractures）and all kinds of secondary pores.The mecury injection experiments show that the conglomerate has the thickest hole roar radius and the best permeability,and the pore structure types can be divided into four categories,the mainly typesⅢ（finepore throat and macropore）,Ⅳ（finepore throat and small pore）.The reservoir is the low porosity and extra-low permeability reservoir in the area,but the correlation between porosity and permeability is better.The reservoir property is controlled by sedimentation,diagenesis and tectonism.
作者
左磊
Zuo Lei(No. 3 Oil Recovery Plant,Qinghai Oilfield Company, PetroChina, Haixi Qinhai 816400, China)
出处
《地质科技情报》
CSCD
北大核心
2018年第1期143-147,共5页
Geological Science and Technology Information
关键词
储层物性
储集空间
孔隙类型
孔隙结构
切12区
reservoir physical property
reservoir space
pore type
pore structure
Qiel2 block
