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

Abstract

AbstractThe bedrock weathered crust in front of the Altun Mountains in the Qaidam Basin is different from other bedrock weathered crust, because the Qaidam Basin is a salt lake basin, the saline water fluid is infiltrated and deposited in the overlying strata, and a large amount of gypsum is filled in bedrock weathered crust, the pore structure is changed. Use core observation, polarized light microscopy, Electron probe, physical property analysis and field emission scanning electron microscopy experiments. Cracks and a small number of dissolved pores in the interior of the weathered crust, the matrix micropores are widely developed. The characteristics of matrix micropores and cracks have been studied, especially the various matrix cracks formed by tectonic and weathered, as well as the stress characteristics of small dissolved pores, 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 natural gas.