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Making Greater Efforts for Oil Exploration and Production for the Long Term Boom of Crude Oil in Sichuan Basin
Liao Guangzhi,Tang Qingsong,Wang Minglei,Huang Shiwei,Jiang Yuqiang,Wang Zhengmao,Dong Weihong,Hong Haitao,Xu Qinglong,Zhang Xiaofeng,Lin Jianping,Ren Lan,Zhao Yulong,Wang Gaofeng,Zhang Xinyu
2025, 44(3):
1-11.
Abstract
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PDF (2693KB)
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Sichuan Basin serves as both a strategic national reserve and a prolific hydrocarbon resource hub. During the Jurassic period, multiple stages of lake basin expansion and vertical stacking developed several sets of high-quality source rocks. The Da’anzhai Member exhibits good favorable source-reservoir configurations with interbedded shales and limestones, and the Lianggaoshan Formation shale had strong hydrocarbon generation capacity and its interbedded shale had good oil storage performance. The Shaximiao Formation, characterized by widely distributed channel sand bodies is further supported by sourceconnected faults and high-quality cap rocks, making it the main battlefield for exploration and development of tight oil. On the basis of reviewing and summarizing the history of Sichuan crude oil exploration and development, including three crude oil battles, one crude oil production enhancement campaigns, and one tackling hard-nut technological problems, it is believed that implementing a new round of crude oil battles is imperative and feasible under the new era and new situation. The new Sichuan crude oil battle targeting unconventional oil is technically feasible with the support of two major technologies including “wideband- azimuth, high-density 3D seismic” and“ horizontal well volume fracturing”. The new battle requires the transformation from limestone to shale sandstone, from fractured to porous reservoirs, from structures to lithology, and the exploration of new exploration models that transition from source to near source. Under the principle of the above “four transformations”, we will carry out a new round of basic research on crude oil exploration and development, from an understanding of the system of crude oil generation, migration and accumulation to making overall arrangements for crude oil work in the Sichuan Basin.“ 3D seismicsystem evaluation-well drilling acceleration-high efficient hydraulic fracturing-long-term development” will be focused to carry out technical research and support, ensuring the achievement of the goal of producing one million tons of crude oil before 2030.
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