普光气田千佛崖组气藏开发技术政策
Development Strategy for the Qianfoya Formation Gas Reservoir in the Puguang Gas Field

普光地区陆相千佛崖组整体为中深层、高压低温、致密砂岩-页岩凝析气藏，两个气藏在纵向上为叠置分布，隔层厚度较大，开发潜力不明确，且致密砂岩及页岩两套不同的气藏需要制定两套或多套针对性强的开发技术政策。本文针对该情况，以国内类似低渗致密气气藏开发方式、井网井型设计、井距设计等作为参考，确定普光地区陆相千佛崖组采用井网衰竭的开发方式，利用水平井进行开发，并对水平井于裂缝角度设定进行评价；参考同类型气藏开发指标，预估该气藏初步产能为5~8 × 10⁴ m³/d；借鉴国内相似气藏开发实践经验，将采气速度控制在2%~3%，天然气采收率为30%，凝析油采收率为25%。
The continental Qianfoya Formation in the Puguang area constitutes a medium-deep, high-pressure, low-temperature, tight sandstone-shale condensate gas reservoir. The two gas reservoirs are vertically superimposed with substantial separation, and their development potential is not well defined. Distinct and highly targeted development strategies are necessary for the two different reservoirs of tight sandstone and shale. This paper refers to domestic development methods for similar low-permeability tight gas reservoirs, including well pattern and well spacing design, to determine that the Qianfoya Formation in the Puguang area should be developed using a depletion method with horizontal wells. An evaluation was conducted on the orientation of fractures in horizontal wells. By referencing development indicators from similar types of gas reservoirs, the initial production capacity of this reservoir is estimated to be 5~8 × 10⁴ m³/d. Drawing on domestic development practices for similar reservoirs, the gas production rate is controlled at 2%~3%, with a gas recovery factor of 30% and a condensate oil recovery factor of 25%.