鄂尔多斯盆地余兴庄—子洲地区上古生界山_2~3储层砂岩成岩作用与成岩相  

Diagenesis and Diagenetic Facies of Sandstones Reservoir in the Upper Palaeozoic Shan_2~3 of Yuxingzhuang-Zizhou Area,Ordos Basin

作　　者：张明松[1,2] 雷卞军[1] 黄有根[3] 龙方毅[1] 孟堃[1] 李波[1] 

机构地区：[1]西南石油大学资源与环境学院,成都610500 [2]华蓥市煤炭管理局,四川广安409800 [3]中国石油长庆油田公司勘探开发研究院,西安710021

出　　处：《沉积学报》2011年第6期1031-1040,共10页Acta Sedimentologica Sinica

摘　　要：鄂尔多斯盆地余兴庄—子洲地区上古生界山23亚段岩石类型主要为石英砂岩、岩屑石英砂岩和岩屑砂岩,目前储层正处于晚成岩阶段B期甚至C期,储集层经历了压实、压溶、硅质胶结、碳酸盐胶结交代、高岭石胶结以及溶蚀等多种成岩作用。在成岩作用研究的基础上,通过大量的岩芯观察和薄片鉴定,结合阴极发光、X衍射、扫描电镜等方法,将研究区划分出6种成岩相,即:弱压实、石英加大较弱、溶蚀成岩相;弱压实、高岭石充填、弱溶蚀成岩相;弱压实、石英加大较强、弱溶蚀成岩相;黏土杂基充填、弱溶蚀成岩相;强压实致密成岩相;碳酸盐胶结交代成岩相,在此基础上对其进行平面叠加,确定了利于储集层发育的优势成岩相。黏土杂基充填、弱溶蚀成岩相、强压实致密成岩相和碳酸盐胶结交代成岩相储集物性最差;弱压实、高岭石充填、弱溶蚀成岩相和弱压实、石英加大较强、弱溶蚀成岩相储层的孔隙度、渗透率总体较低;弱压实、石英加大较弱、溶蚀成岩相储集空间最发育,孔隙类型以粒间孔、粒间溶孔、粒内溶孔为主,弱压实、石英加大较弱、溶蚀成岩相是子洲地区山2段有利的成岩相带,在子洲地区山西组山23亚段形成了天然气优质储集层。The standstone reservoir in the Upper Paleozoic Shan23 of Yuxingzhuang-Zizhou area is domoninated by quartz sandstone lithoclastic quartz sandstone and lithic sandstone.Currently,the reservoir is in the late diagenetic stage B or C period.The diagenesis includes burial compaction,pressolution,silica cementation,carbonate cementation and replacement,kaolinite cementation,and dissolution.Through the core observations and thin section analyses,combining with cathodoluminescence X-ray diffraction and scanning electronmicroprobe studies,six types of diagenetic facies are identified in the Shan23 Formation in the eastern Ordos Basin.They are weak compaction-siliceous cementation facies,weak compaction kaolinite cementation facies,weak compaction-strong siliceous cementation facies,matrix filling facies severe compaction facies,carbonate cementation and replacement facies.Furthermore the planar superimposition was made and the favorable diagenetic facies for reservoir development was determined.Matrix filling facies,severe compaction facies,carbonate cementation and replacement facies is the worst,weak compaction kaolinite cementation facies,weak compaction-strong siliceous cementation facies,the porosity and permeability generally lower,weak compaction-siliceous cementation facies has the best physical property,intergranular pore types,intergranular dissolution pores,intragranular dissolved pore.The weak compaction-siliceous cementation facies determined the favorable diagenetic facies belt of the Shan23 Formation.High-quality reservoirs in the Shan23 Formation are distributed in Zizhou area.

关 键 词：山23 成岩作用 成岩相 子洲地区 鄂尔多斯盆地 

分 类 号：P588.2[天文地球—岩石学]