Influence of tectonic exhumation on porosity of Wufeng–Longmaxi shale in the Fuling gas field of the eastern Sichuan Basin, China

AAPG Bulletin ◽  
2020 ◽  
Vol 104 (4) ◽  
pp. 939-959 ◽  
Author(s):  
Rui Liu ◽  
Fang Hao ◽  
Terry Engelder ◽  
Zhiguo Zhu ◽  
Jizheng Yi ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Gas Field ◽  
Eastern Sichuan Basin ◽  
Longmaxi Shale ◽  
Eastern Sichuan ◽  
Tectonic Exhumation

Geological controls and methane sorption capacity of marine shales of the Fuling shale gas field in the eastern Sichuan Basin, China

2017 ◽  
Vol 23 (4) ◽  
pp. 466-475 ◽  
Author(s):  
Xiaoming Zhang ◽  
Wanzhong Shi ◽  
Qinhong Hu ◽  
Shiwan Zhang ◽  
Haiyan Hu ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Shale Gas ◽  
Sichuan Basin ◽  
Gas Field ◽  
Eastern Sichuan Basin ◽  
Methane Sorption ◽  
Eastern Sichuan

scholarly journals Coevolutionary Dynamics of Organic-Inorganic Interactions, Hydrocarbon Generation, and Shale Gas Reservoir Preservation: A Case Study from the Upper Ordovician Wufeng and Lower Silurian Longmaxi Formations, Fuling Shale Gas Field, Eastern Sichuan Basin

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-21
Author(s):  
Zhijun Jin ◽  
Haikuan Nie ◽  
Quanyou Liu ◽  
Jianhua Zhao ◽  
Ruyue Wang ◽  
...  
Keyword(s):  
Shale Gas ◽  
Sichuan Basin ◽  
Hydrocarbon Generation ◽  
Upper Ordovician ◽  
Gas Field ◽  
Pressure System ◽  
Lower Silurian ◽  
Eastern Sichuan Basin ◽  
Eastern Sichuan

Shale gas deposits are self-sourced, self-accumulating, and self-preserving in the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation of the Fuling Shale Gas Field in the eastern Sichuan Basin. They were both seemingly mixed by secondary oil cracking and kerogen cracking gases during the high maturation window. The reservoir space primarily consists of mineral pores and organic matter (OM) pores, and the shale gas was mainly trapped by a high-pressure system. In this study, the Fuling O3w-S1l Shale Gas Field in the eastern Sichuan Basin was used as a case study to discuss the coevolutionary process and organic-inorganic interactions of hydrocarbon generation, accumulation, and preservation. The results indicate that the processes and mechanisms of organic-inorganic interactions and coevolution of hydrocarbon generation and reservoir preservation are quite different among the shale graptolite zones (GZ) with respect to hydrocarbon generation, types and characteristics of shale gas reservoirs, seal characteristics, and their spatiotemporal relations. In the WF2-LM4 GZ, the favorable OM, biogenic authigenic quartz and organic-inorganic interactions are highly coupled, leading to the high level of coevolution demonstrated within the field, as well as to the favorable conditions for shale gas accumulation. Conversely, the overlying LM5-LM8 GZ seemingly exhibits early densification and late charge and has a reverse mode of reservoir development (i.e., low degree of coevolution). These two coevolutionary processes were conducive to the development of a high degree of spatiotemporal matching between the reservoir (i.e., WF2-LM4 GZ) and the seal (i.e., LM5-LM8 GZ). This is due to underlying differences in their coevolutionary histories. The synthetic work presented here on the coevolutionary processes and mechanisms of formation for organic-inorganic interactions and hydrocarbon generation and reservoir preservation reveals insights into the driving mechanisms of shale gas enrichment, providing a basis for effectively predicting favorable enrichment intervals for shale gas worldwide.

Investigation of methane sorption of overmature Wufeng-Longmaxi shale in the Jiaoshiba area, Eastern Sichuan Basin, China

2018 ◽  
Vol 91 ◽  
pp. 251-261 ◽  
Author(s):  
Haiyan Hu ◽  
Fang Hao ◽  
Xusheng Guo ◽  
Fangyao Dai ◽  
Yongchao Lu ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Eastern Sichuan Basin ◽  
Longmaxi Shale ◽  
Methane Sorption ◽  
Eastern Sichuan

scholarly journals Preliminary Numerical Modeling of CO2 Geological Storage in the Huangcaoxia Gas Reservoir in the Eastern Sichuan Basin, China

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-23
Author(s):  
Hongwu Lei ◽  
Qian Zhang ◽  
Xiaochun Li
Keyword(s):  
Sichuan Basin ◽  
Temperature Drop ◽  
Injection Pressure ◽  
Injection Rate ◽  
Gas Production ◽  
Injection Well ◽  
Gas Reservoir ◽  
Gas Field ◽  
Eastern Sichuan Basin ◽  
Eastern Sichuan

Depleted gas reservoirs are important potential sites for CO2 geological sequestration due to their proven integrity and safety, well-known geological characteristics, and existing infrastructures and wells built for natural gas production. The Sichuan Basin has a large number of gas fields in which approximately 5.89×109 tons of CO2 can be stored. The Huangcaoxia gas field has the best opportunity in the eastern Sichuan Basin for a pilot project of CO2 sequestration due to its relatively large storage capacity and the nearly depleted state. A coupled thermal-hydrodynamic model including faults is built based on the geological and hydrogeological conditions in the Huangcaoxia gas field. The results of the numerical simulations show that the downhole temperature is above 80°C at a downhole pressure of 14 MPa under the constraint of temperature drop in the reservoir due to the strong Joule-Thomson effect. The corresponding injection pressure and temperature at the wellhead are 10.5 MPa and 60°C, respectively. The sizes of the pressure and CO2 plumes after an injection of 10 years are 18 km and 5 km, respectively. The zone affected by temperature change is very small, being about 1-2 km away from the injection well. The injection rate in the injection well Cao 31 averages 6.89 kg/s (21.73×104 tons/a). For a commercial-scale injection, another four wells (Cao 9, Cao 30, Cao 6, and Cao 22) can be combined with the Cao 31 well for injection, approaching an injection rate of 35 kg/s (1.10×106 tons/a). Both the pressure and temperature of CO2 injection decrease with the increasing depleted pressure in the gas reservoir when the latter is below 6 MPa. With the technique of CO2-enhanced gas recovery (CO2-EGR), the CO2 injection rate is improved and approximately 1.58×107 kg of gas can be produced during a studied time period of 10 years.

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