Gas reservoirs in the Upper Triassic Xujiahe Formation

southwestern Sichuan Province are characterized by low resistivity

complex genetic types and complex gaswater relationships

which make them hard to identify. Using data from core analysis

logging

structures

testing and logging responses

we thoroughly examine genetic pattern of low resistivity gas reservoirs in the study area from macro and microviews. According to this study

main controlling factors responsible for the development of these low resistivity gas reservoirs are: 1) muddy sandstone reservoirs with low porosity and permeability developing in the context of lowamplitude structures; 2) complex pore configurations

high water saturation

and high formation water salinity; 3) lowenergy sedimentary environment resulting in fine particles in reservoirs

high mud content

some clay minerals with conductivity and enrichment of conductive minerals in certain areas. Reservoir quality has a negative correlation with resistivity.