摘要
通过普通薄片、铸体薄片、扫描电镜等方法对塔里木盆地于奇东及邻区泥盆系东河塘组砂岩成岩作用、成岩演化及储层发育影响因素进行了深入的研究,明确了该套储层在埋藏过程中主要经历了压实作用、胶结作用、溶蚀作用、交代作用和自生矿物的形成等作用,目前已达中成岩B期。压实作用是成岩早期使原生孔隙遭到破坏的主要因素。胶结作用有碳酸盐胶结、石英次生加大、黄铁矿和黏土矿物胶结,其中碳酸盐胶结对储层物性的贡献大于其破坏作用,石英次生加大、铁质胶结、黏土矿物胶结都对本区储层起破坏作用。早成岩B期碳酸热液和腐殖质释放出的有机酸对不稳定组分的溶解是改善储层物性的重要因素。
Through scanning the thin sections and casting thin sections by electron microscope and other methods. The paper researches the influencing factors of sandstone diagenesis, diagenesis evolution and reservoir development in Devonian System Donghetang Formation of the Yuqidong areas and adjacent areas in Tarim Basin. It is clear and definite that this set of reservoirs in the buried process mainly experienced compaction, cementation, dissolution, metasomatism and authigenic minerals formation process. These reservoirs have reached the B phase of early diagenesis at present. The main factor of destructing the primary pores in early diagenesis is compaction. Cementation includes carbonate cementation, quartz overgrowth, pyrite and cementation of clay minerals. The contribution of the carbonate cementation to the reservoir physical properties is greater than its destruction. The damage of oil reservoirs is attributed to quartz overgrowth, ferruginous cementation and cementation of clay minerals. The important factor of improving the reservoir physical properties is the dissolution of unstable components caused by the carbonated hydrothermal and the organic acid released by humus on B phase of early diagenesis.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第3期231-237,共7页
Journal of Chengdu University of Technology: Science & Technology Edition
关键词
于奇东地区
东河砂岩
成岩作用
储层形成机制
Yuqidong area
Donghetang Formation
diagenesis
formation mechanism
reservoir
