煤成气储层沉积、层序及其空间展布研究——以济阳孤北区块为例  

Deposition,stratigraphic sequences and spatial distribution of coal gas reservoirs——A case study of the Gubei block in Jiyang

作　　者：李增学[1] 张善文[2] 刘华[2] 房庆华[1] 韩美莲[1] 

机构地区：[1]山东科技大学 [2]中国石化胜利油田有限公司,山东东营257015

出　　处：《中国地质》2007年第4期612-621,共10页Geology in China

基　　金：国家重点基础研究发展计划(973计划)项目(2003CB214608)资助。

摘　　要：进行了高分辨层序地层划分,济阳地区石炭—二叠系共划分出7个层序,层序1、2、3为二元结构层序,即由海侵体系域和高水位体系域构成;层序4～7为三元结构层序,由低水位、水进和高水位体系域构成。煤成气主要储层发育在层序4～7的低水位和高水位体系域中。主要的骨架砂岩有:三角洲平原以分流河道为主体的三角洲砂体;河流体系中的河道充填沉积,以边滩为主体;湖泊体系中以湖泊三角洲及湖泊滨岸砂质沉积为主体的分流河道沉积和滨浅湖砂质沉积;河流-湖泊复合沉积体系中的河道充填沉积和滨岸带砂质沉积;决口扇沉积也是骨架砂体之一。储集在二叠系砂岩(属于致密砂岩)储层内的煤成气藏为重要的天然气藏。石炭—二叠系砂岩成岩作用强烈,原生粒间孔隙保存较少,大部分的粒间孔隙是由于后期溶蚀作用形成的。这种次生的粒间孔隙和充填在粒间孔隙之间的杂基或胶结物后期经溶蚀作用形成。High-frequency sequence stratigraphic division of the Permian-Carboniferous in been made. Seven depositional sequences have been distinguished. Sequence Ⅰ, Ⅱ and Ⅲ are that is, they are composed of transgressive systems tracts and the Jiyang area has of binary structure, highstand systems tracts. Sequences Ⅳ to Ⅶ are of tertiary structure, that is, they are composed of lowstand systems tracts, transgressive systems tracts and highstand systems tracts. The main coal gas reservoirs are developed in the lowstand systems tracts and highstand systems tracts in sequences Ⅳ to Ⅷ. The main frame sandstones are： the deltaic sand body of the deltaic plain dominated by distributary channel deposits; filling deposits of the point-bar deposits; distributary channel deposits and river channel in the river system which are dominated by sandy deposits of lakeshores and shallow lakes of the lake system dominated by lake delta and lakeshore sandy deposits; channel filling deposits shore in the composite river-lake sedimentary system; and also flood fan deposits and sandy deposits along the The coal gas accumulations occurring in Permian sandstone （compact sandstone） are the most important natural gas accumulations. As the diagenesis of the Permian-Carboniferous sandstone was strong, scarce primary intragranular pores have been preserved and most intragranular pores formed by late-stage corrosion. Such secondary intragranular pores formed by late-stage corrosion of matrix or cement filling between the intragranular pores.

关 键 词：煤成气 储层沉积学 高分辨层序 空间展布特征 

分 类 号：P618.11[天文地球—矿床学] P531[天文地球—地质学]