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- Title
泸州区块深层页岩气富集高产主控因素.
- Authors
杨洪志; 赵圣贤; 刘 勇; 吴 伟; 夏自强; 吴天鹏; 罗 超; 凡田友; 余林瑶
- Abstract
The key to the scale development of deep shale gas lies in a better understanding of the main controlling factors for its enrichment and high-yield. In this regard, the high-quality shale of the Upper Ordovician Wufeng-Longmaxi Formations in the Luzhou Block, southern Sichuan Basin, was taken as the research object. Based on drilling, logging, seismic and analytical test data of a typical core well there, an in-depth study was conducted on the tectonic, sedimentary, and reservoir characteristics and compressibility of shale in this study area. On this basis, combined with production performance, the main controlling factors of a high-yield shale gas well were discussed. The following findings were achieved. (1) There are two sets of type-I reservoirs with high gas saturation, high total gas content and high brittle mineral content vertically. One is S1l11 1-3 sub-layers with a thickness of 10-20 m, the other is S1l11 4 sub-layer with a thickness of 3-10 m. (2) The thicker the type-I reservoir, the longer the targeted horizontal sections, and the higher initial production rate of a horizontal shale gas well. Under the same scenario, the trial test production rate of a shale gas well in the Luzhou Block is 10-25% higher than that in the Changning and Weiyuan blocks. (3) The deep shelf sedimentary center controls the distribution of high-quality shale in the Luzhou Block, and under the setting of low deep structure and abnormally high pressure, those well-developed high-angle natural fractures are good for the accumulation of free gas, and due to a high brittle material content there, the complex fracture networks are easily formed by fracturing, as a result, a high yield will be easily achieved for a shale gas well in this study area. In conclusion, high-yield and enrichment of shale gas reservoirs should be under such favorable conditions as being located in the deep-water shelf sedimentary center and with well-developed high-angle natural fractures under the setting of low steep structure and abnormally high pressure.
- Subjects
SICHUAN Sheng (China); SHALE gas reservoirs; SHALE gas; BRITTLE materials; GAS wells; GAS reservoirs; SEISMIC testing
- Publication
Natural Gas Industry, 2019, Vol 39, Issue 11, p55
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2019.11.007