摘要
利用鄂尔多斯盆地LX地区山西组铸体薄片、扫描电镜、阴极发光、地球化学资料等,通过统计、计算等方法,对该区山西组储层岩石学特征、成岩作用类型、成岩演化阶段及成岩演化过程进行研究,在此基础上建立研究区山西组成岩相类型及划分标准,并最终确定了该区山西组成岩相平面展布特征。研究表明:压实和胶结作用是研究区山西组储层砂岩致密化的主要原因;成岩阶段主体已经进入中成岩B期;其成岩演化过程为早成岩A期的压实及少量胶结阶段,早成岩B期的压实及少量溶蚀及胶结阶段,中成岩A期的大量溶蚀和胶结阶段以及中成岩B期的碳酸盐胶结阶段;成岩相类型分为4类:中等压实—弱胶结—溶蚀相,中等压实—中等胶结—溶蚀相,中等压实—强胶结相,强压实—杂基强充填相;有利成岩相在研究区分布面积较广,说明研究区具备了良好的勘探潜力,尤其是发育在研究区的中等压实—弱胶结—溶蚀相区域,可作为该区山西组下一步勘探开发的重点。
Analyzed on casting thin sections,SEM,cathode luminescence,geochemical data,etc and combined with the method of statistics and calculation,we studied the petrologic feature,diagenetic types,sequence,and quantitative evolution of Shanxi Formation in LX area. Based on these researches,we established the types and classification standard of diagenetic facies,and determined the diagenetic facies＇ distribution of Shanxi Formation in the studied area. The following conclusions were obtained. The compaction and cementation were the main reasons for the densification of Shanxi formation in the studied area. The diagenetic stage was B of middle diagenesis phase. And the diagenetic evolution as follows： Stage A of early diagenesis phase went through the compaction and little carbonate cementation,and stage B was compaction,little cementation and dissolution. Stage A of middle diagenesis phase was mainly experiencing the dissolution and cementation,and stage B was carbonate cementation. The main types of diagenetic facies were moderate compaction,weak cementation,dissolution facies,moderate compaction,moderate cementation,dissolution facies,moderate compaction,strong cementation facies,and strong compaction,matrix strong filling facies.The favorable diagenetic facies was widely distributed in the studied area,which showed that the study area had a good exploration potential. Especially,the moderate compaction,weak cementation,dissolution facies was key area in the next exploration and development of Shanxi Formation in the studied area.
出处
《沉积学报》
CAS
CSCD
北大核心
2016年第3期594-605,共12页
Acta Sedimentologica Sinica
基金
国家科技重大专项(2016ZX05026-007-005)~~
关键词
LX地区
山西组
成岩演化
成岩相
LX area
Shanxi Formation
diagenetic evolution
diagenetic facies
