渝东南南川页岩气田地质特征及勘探开发关键技术

doi:10.13809/j.cnki.cn32-1825/te.2021.03.005

摘要/Abstract

摘要：

南川页岩气田是我国首个实现商业开发的以常压页岩气为主的页岩气田,为了评价该类型页岩气的勘探开发前景,回顾了该区勘探开发历程,从构造、沉积、储层、保存、地应力、气藏和生产特征等方面分析了气田地质特征,总结梳理了勘探开发关键技术。研究结果表明：①南川页岩气田经历多期构造运动,页岩气地质条件复杂,发育平桥、东胜、阳春沟三个构造带,不同构造带沉积、储层、保存、地应力特征具有较大差异,但总体上为弹性气驱、中深层—深层、常温、高压—常压、干气页岩气藏;②生产特征具有初期测试产量高、液量较高、递减较快、弹性产率中等、单井EUR（估算最终可采储量）相对偏低的特点;③形成了“甜点”目标评价、储层表征、地应力场预测、水平井地质工程一体化设计、开发技术政策和低成本工程工艺技术六大勘探开发关键技术;④南川页岩气田的发现带来了4点启示：一是坚定勘探信心是勘探突破的根基;二是深化基础地质研究是突破的核心;三是创新工艺实践是效益开发的关键;四是推行一体化模式是提质增效的保障。

关键词: 地质特征, 勘探开发, 关键技术, 常压页岩气, 南川页岩气田, 渝东南地区

Abstract:

Nanchuan Shale Gas Field is China's first commercially developed shale gas field dominated by normal pressure shale gas. In order to evaluate the exploration and development prospects of this type of shale gas, the exploration and development history of this area has been reviewed, the geological characteristics of the gas field are analyzed from the aspects such as structure, deposition, reservoir, preservation, in-situ stress, gas reservoir and production characteristics, and finally, the key technologies of exploration and development are summarized. The results show that: ①Nanchuan Shale Gas Field has experienced multi-stage tectonic movement. Its shale gas geological conditions are complex, and there are three structural belts: Pingqiao, Dongsheng and Yangchungou. The characteristics of deposition, reservoir, preservation and in-situ stress are quite different in different tectonic zones, but the shale gas reservoirs are generally with the type of elastic gas drive, mid-deep to deep layer, normal temperature, high pressure to normal pressure and dry gas. ②As for the production, its has the characteristics of high initial test output, high liquid volume, fast decline, medium elastic yield and relatively low single well's EUR. ③Six key technologies of exploration and development have been formed, which are, “sweet spot” target evaluation, reservoir characterization, in-situ stress field prediction, geology-engineering integration design of horizontal wells, development technology policy and low-cost engineering technology. ④The discovery of Nanchuan shale gas field brings four inspiration: firstly, firming exploration confidence is the foundation of exploration breakthrough; secondly, deepening basic geological research is the core of breakthrough; thirdly, innovative technological practice is the key to benefit development; fourthly, the implementation of the integration model is the guarantee of improving quality and efficiency.

Key words: geological features, exploration and development, key technology, normal pressure shale gas, Nanchuan Shale Gas Field, Southeast Chongqing

中图分类号:

TE122

何希鹏,高玉巧,何贵松等. 渝东南南川页岩气田地质特征及勘探开发关键技术[J]. 油气藏评价与开发, 2021, 11(3): 305-316.

Xipeng HE,Yuqiao GAO,Guisong HE, et al. Geological characteristics and key technologies for exploration and development of Nanchuan Shale Gas Field in southeast Chongqing[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(3): 305-316.

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