昭通国家级示范区浅层页岩气立体开发探索 :以海坝背斜南翼YS203H1平台为例
余凯 , 鲜成钢 , 文恒 , 黄小青 , 何勇 , 王建君 , 申颍浩 , 晏晰 , 马圆宏 , 曹炜
地球科学 ›› 2023, Vol. 48 ›› Issue (01) : 252 -266.
昭通国家级示范区浅层页岩气立体开发探索 :以海坝背斜南翼YS203H1平台为例
Stereoscopic Development Exploration of Shallow Shale Gas in Zhaotong National Shale Gas Demonstration Area: Case Study of YS203H1 Pad of Haiba Anticline Southern Limb
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昭通国家级示范区浅层页岩气分布面积广、地质储量大,具备较大开发潜力.为实现示范区中部海坝背斜浅层页岩气的高效建产和资源最大化动用,在总结示范区太阳背斜浅层页岩气立体开发经验基础上,遵循地质工程一体化理念和研究思路对海坝浅层页岩气立体开发可行性及井网部署方式进行探索.结果表明:单层井网开发仍以龙一11小层为最佳靶体,五峰组在当前工艺技术和经济指标下,暂不具备作为独立开发层系经济开发的条件,仍需进一步探索;龙一11小层+龙一13小层间I+II类优质储层厚度大,相比龙一11单层开发,采用龙一11小层+龙一13小层下部双层立体交错井网在相同井距及井数的立体开发方案下,井组EUR及IRR均有较大增加;在相同控制面积条件下,井距和井数之间存在最优化区间,在当前工艺技术和经济指标下,建议250 m为最佳井距;若建井及改造成本下降,有进一步缩小井距、提高井组整体EUR的潜力;大规模水力压裂不但会改变就地应力大小,还会改变水平主应力方向,从而改变近井地带应力状态,使其从走滑型向逆断层状态转变,易形成水平缝导致压裂改造效果变差;采用一次井网相较于加密井网部署方案,能有效降低井间应力负面干扰,提高井间储量动用程度.海坝浅层页岩气适宜采取适度小井距立体交错一次井网部署的开发方式,以助推示范区浅层页岩气的规模效益开发.
昭通示范区 / 浅层页岩气 / 地质工程一体化 / 立体开发 / 水力压裂 / 数值模拟 / 地质力学 / 一次井网
Zhaotong area / shallow shale gas / geology-engineering integration / stereoscopic development / hydraulic fracture / numerical simulation / geomechanics / one-time well deployment
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国家重大科技专项(2017ZX05063)
国家重点研发计划项目(2020YFA0710600)
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