鄂尔多斯盆地苏217井区奥陶系中组合白云岩储层特征及成岩作用  

The characteristic and diagenesis of the dolomite reservoir of the middle assemblages of the Ordovician in well Su217 area,Ordos Basin

作　　者：胡思涵[1,2] 苏中堂[1,2] 陈安清[1,2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都610059

出　　处：《中国矿业》2013年第9期97-101,共5页China Mining Magazine

基　　金：国家自然科学基金重点项目资助(编号:40739901)

摘　　要：鄂尔多斯盆地奥陶系马家沟组顶部非岩溶储层的勘探潜力是现阶段探究的热点。岩石学特征、孔隙类型、物性特征和成岩作用等研究表明,苏217井区奥陶系中组合白云岩的储集岩类型主要有晶粒白云岩和残余砂砾屑白云岩;储集空间类型以晶间孔、剩余粒间孔、溶孔和溶缝为主,属低孔低渗储层;压实压溶作用、胶结作用、充填作用和重结晶作用是储层致密化的主控因素;潮缘滩微相的大气淡水溶蚀作用及选择性白云岩化作用是相对优质储层形成的关键。The potential for gas exploration of the non-karst reservoir,Majiagou formation of the Ordovician in Ordos basin,is a hot issues currently.The petrology properties,porosity types,physical properties,diagenesis are studied in this paper.The results show that the reservoir rocks of the middle assemblages of the Ordovician in the well Su217area are grain dolomite and residual dolarenite.The dolomite reservoir is characterized by low porosity and low permeability,whose reservoir space mainly include intercrystal pores,remaining intergranular pores,dissolved pores and dissolved fractures.The densifying factors for the tight reservoir are the compactionpressolution,cementation,packing action and rejuvenation of crystals.The atmospheric water dissolution and the selective dolomitisation in the bank microfacies are the key factors to the formation of the relatively high-quality dolomite reservoir.

关 键 词：鄂尔多斯盆地 奥陶系 马家沟组 白云岩储层 成岩作用 沉积微相 

分 类 号：P618.13[天文地球—矿床学]