摘要
分析东营凹陷古近系碎屑岩储集层的矿物微观特征、组合关系及其在沉积剖面上的分布特征、主要成岩作用及其地球化学过程 ,认为控制化学成岩作用的地质 地球化学因素主要包括母岩区的岩性特征、沉积环境与沉积相、地层孔隙水性质的改变、早期方解石的充填作用、烃类充注等 ,其中最重要的是地层孔隙水地球化学条件的变化。重点讨论烃类充注对储集层成岩演化的控制作用 :与未被烃类充注的砂岩相比 ,被烃类充注的砂岩的石英次生加大和钾长石的钠长石化程度要低 ,抑制晚期方解石胶结物的充填 ,长石类及碳酸盐类矿物的溶解十分强烈 ,次生孔隙很发育 ;储集层含油饱和度较低时会促进伊利石生长 ,只有在含油程度较高时伊利石生长才受到抑制。图 4照片 6参
The micro characterstics of minerals in clastic reservoir, their assemblage features and the distribution features of clastic grains from different formations, cements and clay minerals in sedimentary profile in Eocene from Dongying Sag, Jingyan Depression are presented. The primary diagenesis of clastic reservoir and its geochemical process, and discusses the geological/geochemical factors controlling diagenesis of clastic rocks are analyzed. This study shows that the geological/geochemical factors controlling diagenesis of the reservoir rocks, including lithologic features of parent rocks, reservoir petrofacies, changes of pore water character in formation, filling of early stage calcites and hydrocarbon in pore. The most important factor is the alteration of geochemical conditions of pore water. The early stage precipitation of calcites, corrasion of feldspars and calcites, the geological/geochemical condictions for the formation and conversion of clay minerals, and the controlling roles that petroleum inflow plays in the evolution of reservoir diagenesis are presented.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第3期79-83,共5页
Petroleum Exploration and Development
基金
国家"十五"重大科技攻关项目(2 0 0 1BA60 5A0 9)
