Enrichment condition and exploration direction of shale gas inShanxi Formation in Western Tianjin

In order to study the enrichment characteristics of shale gas in Permian Shanxi Formation at the west area of Tianjin,in combination with the previous information from each system of petroleum oil,coal and local mine industry and based on the test data of collected sample test,a comprehensive study was conducted on sediment distribution law of carbonaceous shale in Permian Shanxi Formation in the southwest area of Tianjin. The GIS means and the multi layer fuzzy comprehensive judgement method were applied to evaluation on the study region. The study results showed that within the study region,the carbonaceous shale in Permian Shanxi Formation was thick,the organic matters type was Type Ⅲ,the abundance was high,the pore was well developed,but the permeability was poor. The contents of quartz,feldspar and other brittle minerals were over 30%. In comparison with the marine phase carbonaceous shale mainly with quartz,the contents of brittle minerals was low and was not favorable to fracturing. The shale gas favorable exploration area was located in the south area of Wangkouzhen-Liangtouzhen-Jinghaizhen line and the comprehensive evaluation value was over 0.61 and could be the excellent favorable development zone.