Oil & Gas Geology ›› 2011, Vol. 32 ›› Issue (1): 124-132.doi: 10.11743/ogg20110115
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Abstract:
Gas reservoirs in the Upper Triassic Xujiahe Formation, southwestern Sichuan Province are characterized by low resistivity, complex genetic types and complex gaswater relationships, which make them hard to identify. Using data from core analysis, logging, structures, testing and logging responses, we thoroughly examine genetic pattern of low resistivity gas reservoirs in the study area from macro and microviews. 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 lowamplitude structures; 2) complex pore configurations, high water saturation, and high formation water salinity; 3) lowenergy 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.
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URL: http://ogg.pepris.com/EN/10.11743/ogg20110115
http://ogg.pepris.com/EN/Y2011/V32/I1/124