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渝东南常压与高压页岩气典型差异性分析及效益开发对策

周德华 何希鹏 张培先

周德华, 何希鹏, 张培先. 渝东南常压与高压页岩气典型差异性分析及效益开发对策[J]. 石油实验地质, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109
引用本文: 周德华, 何希鹏, 张培先. 渝东南常压与高压页岩气典型差异性分析及效益开发对策[J]. 石油实验地质, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109
ZHOU Dehua, HE Xipeng, ZHANG Peixian. Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109
Citation: ZHOU Dehua, HE Xipeng, ZHANG Peixian. Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109

渝东南常压与高压页岩气典型差异性分析及效益开发对策

doi: 10.11781/sysydz2023061109
基金项目: 

国家科技重大专项 2016ZX05061

中国石化科技部项目 P21087-6

详细信息
    作者简介:

    周德华(1968—),男,博士,教授级高级工程师,从事非常规油气勘探开发管理工作。E-mail:zhoudh@sinopec.com

  • 中图分类号: TE122.3

Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing

  • 摘要: 渝东南地区处于四川盆地东南缘的盆缘转换带,发育常压、高压两种类型页岩气藏。为提高常压页岩气开发效益,从常压与高压页岩气典型差异性分析入手,通过开展钻井、岩心观察、实验分析、成藏条件及生产动态等研究,结合渝东南地区页岩气勘探开发实践,明确了常压页岩气具有优质页岩厚度较薄、孔隙度较低、保存条件较差、含气量中等的典型地质特点。常压页岩气富集受沉积相带、保存条件及地应力场控制,受多期构造改造及差异性抬升影响,形成机理复杂,具有初产较低、稳产期短、递减较慢、返排率高的生产特征。与高压页岩气在地质特点、富集规律、形成机理及生产规律等方面具有明显的地质特征差异性。针对渝东南地区常压页岩气资源品位较差的问题,提出了常压页岩气效益开发的4个关键对策:(1)深化基础地质研究,明确富集规律和甜点目标;(2)建立变井距、长水平段、小夹角、强改造、低高差、控压差的开发技术政策,提高单井产量;(3)加大低成本钻井和高效压裂等工程工艺创新,实现提速提效降本;(4)创新体制机制建设,打造高效组织运行模式。4个关键对策有效促进了常压页岩气由资源向储量、从储量向效益的转变,助力渝东南常压页岩气实现规模效益开发。

     

  • 图  1  渝东南地区研究区位置、地层分布(a)与地层综合柱状图(b)

    Figure  1.  Location, stratigraphic distribution (a), and stratigraphic column (b) of study area in southeastern Chongqing

    图  2  渝东南上奥陶统五峰组—下志留统龙马溪组沉积剖面示意

    Figure  2.  Sedimentary profile of Upper Ordovician Wufeng to Lower Silurian Longmaxi formations in southeastern Chongqing

    图  3  渝东南常压区与高压区上奥陶统五峰组—下志留统龙马溪组一段综合对比

    Figure  3.  Comprehensive correlation of Upper Ordovician Wufeng to Lower Silurian Longmaxi formations in normal and high pressure areas in southeastern Chongqing

    图  4  渝东南常压区与高压区优质页岩有机质孔氩离子抛光扫描电镜照片

    a.常压区,③小层; b.常压区, ②小层; c.常压区, ①小层; d.高压区, ③小层;e.高压区, ②小层;f.高压区, ①小层

    Figure  4.  SEM photographs of organic pores in high-quality shale in normal and high pressure areas in southeastern Chongqing

    图  5  渝东南常压区与高压区构造地质剖面示意

    Figure  5.  Geological profile of structures of normal and high pressure areas in southeastern Chongqing

    图  6  渝东南常压区与高压区地应力特征对比

    Figure  6.  Comparison of in-situ stress characteristics between normal and high pressure areas in southeastern Chongqing

    图  7  渝东南常压区与高压区页岩气成藏模式

    Figure  7.  Shale gas accumulation patterns of normal and high pressure areas in southeastern Chongqing

    图  8  渝东南常压页岩气气液两相相渗曲线

    ①压力系数1.3;②压力系数1.2;③压力系数1.1;④压力系数1.0

    Figure  8.  Gas-liquid two-phase relative permeability curves of normal pressure shale gas in southeastern Chongqing

    图  9  渝东南常压页岩气与高压页岩气生产阶段模式

    Figure  9.  Production stage modes of normal and high pressure shale gas in southeastern Chongqing

    图  10  渝东南地区有利目标分布

    Figure  10.  Distribution of favorable targets in southeastern Chongqing

    表  1  渝东南地区常压与高压页岩气地质特征对比

    Table  1.   Geological characteristics of normal and high pressure shale gas in southeastern Chongqing

    地质特征 气藏类型
    常压页岩气 高压页岩气
    沉积   优质页岩厚24~35 m,TOC含量3.0%~3.3%,石英含量40%~50%,黏土矿物含量30%~40%   优质页岩厚38~45 m,TOC含量3.5%~4%,石英含量40%~50%,黏土矿物含量30%~40%
    储集层   孔隙度3.5%~5.0%,高角度缝及层理缝发育   孔隙度4%~6%,高角度缝相对不发育
    构造   处于四川盆地盆缘过渡带及盆外褶皱区,构造抬升较早(距今120~100 Ma),改造强烈,地层产状陡且变化快   处于四川盆地盆内稳定区,构造抬升较晚(距今80 Ma),改造相对较弱,地层产状较平缓
    保存与赋存   保存条件一般,压力系数0.9~1.3,吸附气占比高(40%~80%)   保存条件较好,压力系数大于1.3,吸附气占比低(25%~40%)
    地应力场   地应力较小(40~80 MPa),最大和最小水平主应力差异系数大,南川地区0.1~0.15,彭水—武隆地区0.2~0.34   地应力适中(50~90 MPa),最大和最小水平主应力差异小,差异系数0.11~0.13
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-09-02
  • 修回日期:  2023-10-13
  • 刊出日期:  2023-11-28

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