Paleogeomorphy evolution of the Ordovician weathering crust and its implication for reservoir development,eastern Ordos Basin

作     者：Xinshan Wei Junfeng Ren Junxing Zhao Daofeng Zhang Shunshe Luo Liubin Wei Juanping Chen 

作者机构：National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas FieldsShaanxi 710018China Research Institute of Exploration and DevelopmentPetroChina Changqing Oilfield CompanyShaanxi 710018China Institute of Sedimentary GeologyChengdu University of TechnologySichuan 610059China Yangtze UniversityHubei 434100China 

出 版 物：《Petroleum Research》 (石油研究（英文）)

年 卷 期：2018年第3卷第1期

页      面：77-89页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：The work was supported by the National Science and Technology Major Project of China(No.2016ZX05004 2016ZX05050) 

主　　题：The Ordovician weathering crust Paleogeomorphy Karst highland Karst slope Karst basin Karst reservoir Majiagou Formation The eastern Ordos Basin 

摘      要：Gas reservoir development of the Ordovician weathering crust in the Ordos Basin is closely controlled by the pre-Carboniferous *** studies show that the paleogeomorphy is high in the west and low in the east,and the karst highland,karst slope and karst basin are developed from west to *** further exploration in recent years,many karst breccia that represent strong karstification,are found in the east area which previously is considered to be the Ordovician karst ***,it is necessary to revaluate controlling factors of karst paleogeomorphy development from a viewpoint of the dynamic paleogeomorphy evolution,to investigate the paleogeomorphy evolution of the Ordovician weathering crust in geological history and guide further research and prediction of development law of reservoir *** order to reconstruct the paleogeomorphy of the weathering crust in the top of Ordovician in the east Ordos Basin,paleogeography,thickness of residual strata and paleokarst characteristics are well *** result shows that a wide range of paleokarst highland occurred in the central to east part of Ordos Basin in the early period,and the karst reservoir spaces were formed;but in the late period,the east part of the basin gradually evolved into the paleokarst basin,the current pre-Carboniferous paleogeomorphy was thus formed,and the dissolution reservoir spaces formed in the early period were mostly filled,accordingly the reservoirs were *** fracture networks formed by cave collapse connect intercrystalline pores of dolomite,therefore,the reservoirs can still be well preserved locally and are worthy targets for hydrocarbon exploration.