Abstract:

China marine shale gas field is characterized by wide distribution and richness in resources.But compared with North America, because of suffering multi-stages tectonic reworking, China marine shale is older and more mature, as a result, it is unique in preservation condition and buried depth.Based on these features, the theory of ‘three-element enrichment’, whose cores include the conditions of hydrocarbon generation, reservoir conditions and shale gas preservation conditions, is put forward.On this basis, shale gas exploration is focused on Sichuan Basin and its peripheral regions, and the Lower Silurian of Southeast region of Sichuan Basin is chosen to be the preferred breakthrough field for shale gas exploration by China Petroleum & Chemical Corporation.Shale gas zone and the target evaluation method is set up, and Jiaoshiba Block of Fuling is as the target area.And in 2012, well Jiaoye 1 was drilled, and discovered the first large shale gas field in China, i.e.marine shale gas field of Longmaxi Formation in Jiaoshiba Block.Drilling technologies and multi-stage fracturing technologies were developed for the marine shale with shallow to moderate burial depths.The rapid and highly efficient development of the Jiaohsiba shale gas field was realized through effective management under the guidance of integrated exploration and development.

Key words: three-element enrichment, integrated exploration and development, marine layer, shale gas, Silurian, Jiaoshiba gas field