Analysis of cause characteristics of Pisha-sandstone in Mu US Desert — Based on Sedimentary Environment Perspective

Abstract

The Pisha-sandstone, located in the southeastern margin of the Ordos Basin, which is the thick sandstone, sand shale and argillaceous sandstone interbedded rocks of Paleozoic Permian Triassic and Jurassic Cretaceous Mesozoic, mainly composed of continental clastic rock. The study found that when the hard Pisha-sandstone are anhydrous water, such as sludge, vulnerable to erosion characteristics which due to its good permeability, high plasticity index, good hydrophilicity. From the micro perspective, the rock composition has mainly the quartz that due to its simple structure, low degree of cementation, poor construction strength. In addition, through the analysis of Pisha-sandstone lithic-facies characteristics, composition, characteristics of sedimentary evolution in the various strata of Paleozoic and Mesozoic, to restore Pisha-sandstone formed in different sedimentary environment during the period, in order to explain the causes of the different thick layer of Pisha-sandstone.