期刊
ENERGIES
卷 15, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/en15145261
关键词
Fuling shale gas field; leaking gas accident; chemical composition; carbon isotope; RTM; gas origin
资金
- Special Project on Performance Incentive Guidance of Chongqing Scientific Research Institution [cstc2018jxj190003]
- Key Technology Research and Application of Deep Shale Gas Green Development in Western Chongqing area [cstc2019jxj190002]
This paper reports a ground natural gas leaking event at the Fuling shale gas field. By investigating and studying the leaking spots at different locations, the cause of the leakage incident was determined to be mainly due to gas leakage caused by fracture development. The research results have certain guiding significance for the prevention and treatment of similar leakage incidents.
A ground natural gas leaking event at the Fuling shale gas field is reported in this paper. Thirteen leakage spots were discovered in two places near the SW-1 and SW-2 drilling wells. The biggest leak rate was above 1000 m(3) per day, and no H2S was identified in any of the 13 leaking spots, according to the field study. The chemical components, carbon isotope properties of the leaking gases, and the geological context of the leaking location were researched in order to determine the reason for the leaking incident. From the geological conditions, the Shimen 1# fault belt cuts the whole strata from bottom to top, according to seismic reverse time migration (RTM), and the fault and leaking spots are located in the range of the surface projection of the horizontal section of the adjacent shale gas well. The fracture development evaluation shows that the Wufeng-Longmaxi Formation, which is also the producing layer of the Fuling shale gas field, has a very high possibility of fracture development. From the geochemical view, the carbon isotope of the leaking gases lies in the range of the Wufeng-Longmaxi Formation, showing that the Wufeng-Longmaxi Formation is the gas source of the leaking gas.
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