Shiyou shiyan dizhi (Nov 2023)
Development progress and outlook of deep and normal pressure shale gas of SINOPEC
Abstract
In the past decade, with the improvement of shale gas exploration and development theory and techno-logy, the commercial development of marine shale gas from Ordovician Wufeng to Silurian Longmaxi formations in southern China has been achieved, and the target of shale gas exploration and development is gradually shifting towards shale gas of deep and complex structural areas and new formations. In order to further promote efficient exploration and development of shale gas, a systematic review was conducted on the recent exploration and deve-lopment progress of SINOPEC shale gas and an analysis was conducted on the development trend of shale gas in China. The research results indicate that: ① The high-quality Fuling National Shale Gas Demonstration Zone has been built and a key technology system for three-dimensional development of marine shale gas has been innovatively formed. ② The large-scale and efficient development of atmospheric shale gas in Dongsheng and Baima blocks of Nanchuan has been realized, and four shale gas accumulation and dispersion models have been constructed: anticline, monocline, reverse fault blocking, and residual syncline. A fine zoning and differentiated development model and a low-cost technology system for atmospheric shale gas have been preliminarily formed. ③ The deep large-scale fields of trillions of square meters in southeastern Sichuan basin edge have been preliminarily implemented, an "overpressure rich gas" model of marine deep shale gas has been innovatively formed, and a fracturing technology system of deep shale gas in the deep range of 4 000-4 500 m has been preliminarily formed. ④ Major breakthroughs have been made successively in Jurassic of Yuanba and Puguang, Permian of Hongxing and Puguang, and Cambrian of Jingyan and Qianwei. ⑤ The future breakthrough and development of shale gas cannot be achieved without innovative research on exploration and development theory and technology. The integration of exploration and development, geological engineering, and technology and economy must be adhered to. The complexity of deep, normal-pressured, and geological characteristics of new shale gas formations should be fully understood. In addition, policy support is also required.
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