Salt-Lake Basin Bedrock Weathered Crust Gas Reservoir in the Altun Mountains Front of the Qaidam Basin,Western China  

作　　者：ZHANG Yongshu JIA Chengzao LI Guoxin LI Jiangtao WANG Bo ZHAO Fan YUE Dali SHI Zhenghao ZHU Jun WANG Yuanfei ZHANG Yi CHEN Yangyang ZHANG Fenying YU Xue XU Li Hou Lili SONG Yue 

机构地区：[1]School of Earth Sciences,China University of Petroleum(Beijing),Beijing 102249,China [2]Qinghai Provincial Key Laboratory of Plateau Saline-Lacustrine Basinal Oil&Gas Geology,Dunhuang,Gansu 736202,China [3]College of New Energy and Materials,China University of Petroleum(Beijing),Beijing 102249,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第5期1555-1567,共13页地质学报（英文版）

基　　金：the National Major Project of Science and Technology in developing great oil&gas field and coal bed gas(Grant No.2016ZX05007-006);the Study on water-cut control and production stabilization in the old gasfields and efficient development in new gasfields in Qaidam Basin(Grant No.2016E-0106GF)。

摘　　要：The bedrock weathered crust in front of the Altun Mountains in the Qaidam Basin,western China,is different from others because this is a salt-lake basin,where saline water fluid infiltrates and is deposited in the overlying strata.A large amount of gypsum infills the bedrock weathered crust,and this has changed the pore structure.Using core observation,polarized light microscopy,electron probe,physical property analysis and field emission scanning electron microscopy experiments,the characteristics of the weathered bedrock have been studied.There are cracks and a small number of dissolved pores in the interior of the weathered crust.Matrix micropores are widely developed,especially the various matrix cracks formed by tectonics and weathering,as well as the stress characteristics of small dissolved pores,and physical properties such as porosity and permeability.This‘dual structure’developed in the bedrock is important for guiding the exploration of the lake basin bedrock for natural gas.

关 键 词：upstream gas reservoir BEDROCK weathered crust cracks matrix micropores salt lake Qaidam Basin 

分 类 号：P618.13[天文地球—矿床学]