摘要
大安油田泉四段自生伊利石普遍存在于岩石孔喉中,主要以3种产状分布:1分布在碎屑颗粒表面的蜂窝状伊利石,由蒙皂石转化而来;2由高岭石转化的丝状伊利石,常以搭桥式分布在岩石颗粒之间或其他黏土矿物边缘;3片状伊利石,可能是由蒙皂石转化或直接结晶形成的。从表面上看,储集层孔喉中发育的自生伊利石会增加喉道弯曲度,减小孔隙空间。但伊利石同时也会防止石英次生加大而对储集层孔隙度起保护作用,并且伊利石的形成也会促进钾长石溶解形成次生孔隙。综合来看,自生伊利石对储集层物性起促进作用。通过垂向储集层物性及自生伊利石含量确定主力油层,并叠合主力油层沉积微相图和成岩相,判定平面上伊利石含量较高的A区和胶结程度较弱的B区为今后勘探有利目标。
The authigenic illite is commonly existed in pore throats of compact sandstone of the 4th member of the Quantou Formation in the Da＇an Oilfield.It occurs mainly in three kinds of forms.The first one is honeycomb illite which is distributed on the surface of clastic particles.It was transformed from smectite.The second one is filamentous illite which is often distributed between rock particles or on the edge of other clay minerals.It was transformed from kaolinite.The third one is flaky illite which could be transformed from smectite or formed by direct crystallization.On the one hand,the development of authigenic illite in pore throats of the reservoir could result in the increase of the throat curvature and the reduction of the pore space.On the other hand,the development of authigenic illite could prevent the secondary overgrowth of quartz and then preserve the reservoir porosity.In addition,the formation of authigenic illite could promote the dissolution of potassium feldspar and result in the formation of secondary porosity.Altogether,the development of authigenic illite could improve the reservoir property.Through the combination of the sedimentary microfacies and diagenetic facies of the major petroleum reservoir,which was determined based on the vertical property and the content of authigenic illite of the sedimentary rocks,it is determined that Zone A,in which there are sedimentary rocks containing relatively high contents of authigenic illite,and Zone B,in which there are weakly cementated sedimentary rocks,are potential future exploration targets.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2016年第4期692-700,共9页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
东北石油大学研究生创新科研项目(YJSCX2015-006NEPU)
国家高技术研究发展计划项目(2013AA064903)
国家重点基础研究计划前期研究专项(2012CB723102)
关键词
自生伊利石
分布特征
储集层控制作用
泉四段储集层
大安油田
authigenic illite
characteristics of distribution
control action on reservoirs
the 4th member of Quantou Formation
Daan Oilfield
