Zhaotong National Shale gas Demonstration Zone, Sun- Dazhai block Longmaxi Group of 800 million cubic meters per year Shallow shale gas surface construction project
High-barrier gas transmission special pipeline appliance
The following is the Zhaotong National Shale gas Demonstration Zone, Sun- Dazhai block Longmaxi Group of 800 million cubic meters per year，The specific design parameters of the products of the Shallow shale gas surface construction project, after comprehensive analysis of the residual thickness of the shale of the Wufeng Group-Longmaxi Group, as well as the tectonic deformation style of the overlying strata, and the characteristics of the development of stratigraphic joints and cracks, etc., it is believed that the northern extrusion and deformation zone and its southern edge have the purpose of shale deformation and transformation. The thickness of the shale is large, the upper covering layer is developed, the intensity of shale deformation and transformation is weak, the joints and fissures are developed along the layers, the shale gas has good capping performance and superior preservation conditions, and it is in the closed system below the gas weathering zone, and the composition of natural gas is dominated by the hydrocarbon gases such as methane, and the shale gas desserts in the demonstration area and the construction of the production area (Golden Dam, Zijin Dam, Sun, Yunshan Dam-Hai Dam, Dazhai) are all distributed in the north; the central north area is in the north, and the central north area is in the north, and the central north area is in the north. Distributed in the north; the central north area is affected by the thinning of its own thickness, the reduction of the upper cover layer, shale deformation and transformation enhancement, joints and fissures diagonally intersecting strata development, shale gas sealing performance weakened, preservation conditions deteriorated, in the vicinity of the gas weathering zone, the system as a whole is in a semi-closed state, the natural gas composition mixed with a certain amount of N2, CO2, the local area of the closed system can be enriched into the shale gas desserts; The south-central and southern deformation zone is affected by the sharp extinction of the shale of the main purpose layer itself and the enhancement of the stripping of the upper cover layer, and the further enhancement of shale deformation and transformation, the intersection angle between joints and fissures and strata gradually increases, and the role of penetrating the layer is enhanced, so that the shale gas sealing performance is further weakened, and the preservation conditions are further worsened, and it is above the gas weathering zone, and the system is in semi-open state, and the ability of sealing is limited, and a large amount of N2, CO2 is mixed with the natural gas composition. The natural gas composition is mixed with a large amount of N2 and CO2, and is mainly enriched with low abundance and low grade shale gas. Under this very poor geological and climatic conditions, Zhaotong Demonstration Area has gone through five stages of exploration and development work for more than ten years, including mountain shale gas assessment and selection, shale gas dessert pilot evaluation, demonstration area development and practice construction, medium-depth shale gas large-scale development and shallow shale gas large-scale development, and deployed and implemented three major production areas, namely, the Jinjinba-Zijinba medium-depth and the Sun Shallow shale gas, with cumulative proved natural gas in the area. We have built the Zhaotong Basin Outer Mountain Shale Gas Field and become the third largest shale gas production base in China, with a cumulative proven geological reserve of over 3,100×108m3 of shale gas and an annual gas production capacity of nearly 17×108m3 in 2021.
