Through observations, sampling and laboratory analyses of 15 black shale outcrops in the Sichuan Basin and its periphery, we studied shale-gas accumulation conditions of the Lower Cambrian black shale, such as depositional facies, types and contents of organic matter and its maturity, distribution, porosity and gas contents of the black shale etc.. Compared with major U.S. gas-producing shales, the Lower Cambrian shale in the Sichuan Basin and its periphery was characterized by great thickness, abundance of organic carbon, high maturity and elevated gas content, being capable of good geological conditions for shale-gas reservoir development. Some applied indices, such as thickness of the shale, content of organic matter, maturity and gas content, with a superimposition method of integrated information indicated that the most favorable areas for shale-gas accumulations in the Lower Cambrian shale are the southern Sichuan-northern Guizhou-central Guizhou, western Hubei-eastern Chongqing and northeast Sichuan. Based on the measured gas content, the amount of shale-gas resources in the Lower Cambrian was calculated with the volumetric method to be 3.3×1012 m3~11.4×1012 m3, with a median value of 7.4×1012 m3.
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NIE Haikuan ZHANG Jinchuan LI Yuxi. Accumulation conditions of the Lower Cambrian shale gas in the Sichuan Basin and its periphery[J]. Acta Petrolei Sinica, 2011, 32(6): 959-967.
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2011, Vol. 32 
