深层致密气地质工程一体化实践——以川西须家河组为例

doi:10.3969/j.issn.1672-7703.2024.03.003

摘要/Abstract

摘要： 川西新场—合兴场须家河组天然气资源丰富，中国石化探区保有探明地质储量超1700×10⁸m³，储层具有气藏埋藏深（4500～5500m）、地层压力高（压力系数为1.4～1.7）、地层破裂压力高（110～165MPa）、特低孔隙度（平均孔隙度为3.7%）、特低渗透率（平均渗透率为0.07mD）的“一深两高两低”特点，为天然气成藏地质理论认识及高效开发带来了多重挑战，制约了气藏的勘探开发进程。以地质工程一体化融合实践为攻关思路，深化致密砂岩气输导体成藏认识，明确成藏机理及富集高产规律，以地质甜点发育模式深入解剖为切入点，阐明气藏甜点形成机制，建立甜点地质模式，抓住裂缝和储层地震精细刻画和定量预测技术、优化钻井及储层改造等关键技术，开展地质—地球物理—钻完井关键技术的地质工程一体化协同攻关与技术—经济一体化目标实践，技术序列的成功应用支撑气田规模上产，已累计新建产能超10×10⁸m³，保障合兴场气田新增探明地质储量超1300×10⁸m³，进一步证实了地质工程一体化是低品位气藏有效开发的必经之路，推动了川西须家河组气藏的效益开发进程，为致密难动用储量，特别是深层致密气的勘探开发提供借鉴。

关键词: 川西, 须家河组气藏, 致密砂岩, 地质工程一体化, 效益开发

Abstract: There are abundant natural gas resources in Xujiahe Formation in Xinchang-Hexingchang in western Sichuan Basin, with proven reserves of 1700×10⁸ m³ in Sinopec exploration blocks. The reservoir is characterized by “one-deep, two-high, and two-low”, including great burial depth of gas reservoir (4500-5500 m), high formation pressure (pressure coefficient of 1.4-1.7), high fracture pressure (110-165 MPa), ultra-low porosity (average of 3.7%), and ultra-low permeability (average of 0.07 mD), which brings multiple challenges to geological theoretical understanding and high-efficiency gas development, and restricts the progress of exploration and development. Based on the research idea of geology and engineering integrated practice, understanding of tight sandstone gas migration and accumulation has been deepened, and gas accumulation mechanism and enrichment and high-yield production laws have been identified. By starting from the detailed analysis of development mode of geological sweet spots, the formation mechanism of gas reservoir sweet spots has been determined, and a sweet spot geological model has been established. By applying fracture and reservoir fine seismic characterization and quantitative prediction technology, and optimizing drilling and reservoir reconstruction technologies, the geology and engineering integrated collaborative research on key technologies such as geology, geophysics, drilling and completion has been conducted, and the practice of technology and economy integration has been implemented. The successful application of technical sequences supports the large-scale production of the gas field, with a cumulative production capacity of over 10×10⁸ m³, and new addition proven geological reserves of 1300×10⁸ m³ in Hexingchang Gas Field, which further confirms that the integration of geology and engineering is a necessary way for the effective development of low-grade gas reservoirs, promotes the beneficial development of Xujiahe gas reservoir in western Sichuan Basin, and provides reference for the exploration and development of tight and difficult to use reserves, especially deep tight gas.

中图分类号:

TE375

林永茂, 雷炜, 缪尉杰. 深层致密气地质工程一体化实践——以川西须家河组为例[J]. 中国石油勘探, 2024, 29(3): 21-30.

Lin Yongmao, Lei Wei, Miao Weijie. Practice of geology and engineering integration in deep tight gas development: a case study of Xujiahe Formation in western Sichuan Basin[J]. China Petroleum Exploration, 2024, 29(3): 21-30.

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