Abstract: During the 14^th Five–Year Plan period, Shaanxi Yanchang Petroleum (Group) Co., Ltd. (referred to as Yanchang Petroleum)
has continued to increase its exploration and development efforts, and has made significant progress in the exploration, development, and theoretical technology of low-permeability–tight oil, shale oil, and natural gas in Ordos Basin. (1) In the field of low-permeability–tight oil, the theory of “alternating” oil accumulation has continuously been deepened, proposing a “spatially and temporally orderly near source oil accumulation” model for tight oil, and a “rate controlling and permeability increasing water injection” technology and open hole well area secondary development technology have been formed for low-permeability–tight oil, with new addition proven oil geological reserves of nearly 3.5×10⁸t, laying solid foundation for steady crude oil production with an annual output of over 10 million tons. (2) In the field of shale oil, the exploration orientation of “production capacity construction in ClassⅠzone, research and development in Class Ⅱ zone, and strategic reserve in Class Ⅲ zone” has been established, and an integrated technical system of shale oil geology–engineering–development has been constructed, with new addition proven shale oil geological reserves of nearly 0.5×10⁸t, and an annual output of 35×10⁴t. (3) In the field of natural gas, the theoretical understanding of “sand controlled by frequent migration of shallow water shorelines” in the Upper Paleozoic has been deepened, and a gas accumulation model with superimposed weathered crust gas reservoirs and carbonate rock inner gas reservoirs in the Lower Paleozoic has been proposed, achieving initial exploration results in new types, new formations, and new fields, with new addition proven gas geological reserves of approximately 2800×10⁸m³, and an annual output exceeding 10 billion cubic meters. Based on a systematic review of oil and gas exploration and development achievements and theoretical and technological advancements during the 14^th Five–Year Plan period, Yanchang Petroleum has outlined its exploration and development orientations during the 15^th Five–Year Plan period. First, the company will continue to uphold the resource strategy of “stabilizing oil production, increasing gas output, and strengthening unconventional resource production”, and make efforts on key exploration technological research of ultra-low permeability–tight oil, tight sandstone gas, and carbonate gas to solidify the resource foundation for long-term development. Second, the company will vigorously expand unconventional resources such as shale oil, coalbed methane, and shale gas, and cultivate strategic replacement fields, striving to drive continuous innovation and high-quality development in oil and gas exploration and development.

Key words: Yanchang Petroleum, Ordos Basin, ultra-low permeability–tight oil, shale oil, tight gas