Eogenetic karst and its control on reservoirs in the Ordovician Majiagou Formation, eastern Sulige gas field, Ordos Basin, NW China

作     者：XIE Kang TAN Xiucheng FENG Min WANG Baobao ZHONG Shoukang YANG Mengying NIE Wancai QIAO Zhanfeng ZENG Wei XIE Kang;TAN Xiucheng;FENG Min;WANG Baobao;ZHONG Shoukang;YANG Mengying;NIE Wancai;QIAO Zhanfeng;ZENG Wei

作者机构：State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu 610500China Department of Key Laboratory of Carbonate Reservoir of CNPCSouthwest Petroleum UniversityChengdu 610500China Exploration and Development Research Institute of PetroChina Changqing Oilfield CompanyXi’an 710018China Yihuang Natural Gas Department of PetroChina Changqing Oilfield CompanyXi’an 710018China PetroChina Hangzhou Research Institute of GeologyHangzhou 310023China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2020年第47卷第6期

页      面：1246-1261页

核心收录：

学科分类：0808[工学-电气工程] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0820[工学-石油与天然气工程] 0818[工学-地质资源与地质工程] 0807[工学-动力工程及工程热物理] 0708[理学-地球物理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 082002[工学-油气田开发工程] 0814[工学-土木工程] 

基　　金：Supported by the China National Science and Technology Major Project(2016ZX05004006-001-002) CNPC-Southwest Petroleum University Innovation Consortium Technology Cooperation Project 

主　　题：porous reservoir reservoir characteristics eogenetic karst dolomite Majiagou Formation Ordovician Sulige gas field Ordos Basin 

摘      要：To further ascertain the origin of the Ordovician Majiagou Formation reservoirs in the Ordos Basin,the M54-M51 sub-members of the Ordovician Majiagou Formation in the eastern Sulige gasfield of Ordos Basin were taken as examples to analyze the vertical development characteristics of eogenetic karst and to discover the dissolution mechanism and its control on reservoirs through observation of a large number of cores and thin sections.According to detailed analysis of petrologic characteristics,the reservoir rock types include micritic dolomite,grain dolomite and microbialite which have mainly moldic pore,intergranular(dissolved)pore,and(dissolved)residual framework pore as main reservoir space respectively.The study area developed upward-shallowing sequences,with an exposure surface at the top of a single upward-shallowing sequence.The karst systems under the exposure surface had typical exposure characteristics of early dissolution and filling,indicating these reservoirs were related to the facies-controlled eogenetic karstification.With the increase of karstification intensity,the reservoirs became worse in physical properties.