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川东南五峰组—龙马溪组深层、超深层页岩储层特征及其页岩气勘探意义

魏富彬 刘珠江 陈斐然 袁桃 李飞

魏富彬, 刘珠江, 陈斐然, 袁桃, 李飞. 川东南五峰组—龙马溪组深层、超深层页岩储层特征及其页岩气勘探意义[J]. 石油实验地质, 2023, 45(4): 751-760. doi: 10.11781/sysydz202304751
引用本文: 魏富彬, 刘珠江, 陈斐然, 袁桃, 李飞. 川东南五峰组—龙马溪组深层、超深层页岩储层特征及其页岩气勘探意义[J]. 石油实验地质, 2023, 45(4): 751-760. doi: 10.11781/sysydz202304751
WEI Fubin, LIU Zhujiang, CHEN Feiran, YUAN Tao, LI Fei. Characteristics of the deep and ultra-deep shale reservoirs of the Wufeng-Longmaxi formations in the southeastern Sichuan Basin and the significance of shale gas exploration[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 751-760. doi: 10.11781/sysydz202304751
Citation: WEI Fubin, LIU Zhujiang, CHEN Feiran, YUAN Tao, LI Fei. Characteristics of the deep and ultra-deep shale reservoirs of the Wufeng-Longmaxi formations in the southeastern Sichuan Basin and the significance of shale gas exploration[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 751-760. doi: 10.11781/sysydz202304751

川东南五峰组—龙马溪组深层、超深层页岩储层特征及其页岩气勘探意义

doi: 10.11781/sysydz202304751
基金项目: 

国家自然科学基金企业创新发展联合基金“海相深层页岩源—储动态演化与页岩气富集机理” U19B6003-03-03

详细信息
    作者简介:

    魏富彬(1989—),男,工程师,从事非常规油气评价研究。E-mail: weifb.ktnf@sinopec.com

  • 中图分类号: TE122.23

Characteristics of the deep and ultra-deep shale reservoirs of the Wufeng-Longmaxi formations in the southeastern Sichuan Basin and the significance of shale gas exploration

  • 摘要: 四川盆地东南地区上奥陶统五峰组—下志留统龙马溪组中深层领域页岩气勘探及页岩储层特征与主控因素的研究已经取得了丰硕成果,而作为当前页岩气勘探重点的深层、超深层领域,由于受钻井等因素的制约,对于其储层发育特征及与中深层页岩储层的差异等研究还不够深入。为了明确五峰组—龙马溪组深层、超深层页岩储层特征,为勘探部署提供依据,选取川东南地区4口埋深在2 000~6 000 m的典型页岩气钻井,系统开展了深层、超深层页岩储层发育特征及差异对比研究,探讨了储层孔隙发育的成因。研究表明:(1)埋深在6 000 m以内,五峰组—龙马溪组页岩储层依然能够发育高孔有效储层,且随埋深的增大孔隙度无明显变化,但是有机质孔的形态、孔隙结构及连通性存在一定差异,即随着埋深的增大,有机质孔孔径相对变小,孔隙连通性变差;(2)明确了生物成因的硅质是孔隙发育的基础,流体超压是储层孔隙保持的关键,在两者联合作用下,深层、超深层页岩高孔隙优质储层得以发育和保持;(3)基于储层发育的研究,将页岩气勘探拓深至6 000 m,明确了下一步页岩气勘探方向。初步评价四川盆地及周缘五峰组—龙马溪组深层、超深层页岩气(埋深为4 000~5 000 m)资源量超2×1012 m3

     

  • 图  1  四川盆地及周缘上奥陶统五峰组底界埋深及重点气田、取样井位置

    Figure  1.  Burial depth of the bottom boundary of the Upper Ordovician Wufeng Formation and locations of the key gas fields and sampling wells in the Sichuan Basin and its periphery

    图  2  四川盆地及周缘下志留统龙马溪组沉积早期沉积相平面分布

    Figure  2.  Plane distribution of sedimentary facies during the early deposition of the Lower Silurian Longmaxi Formation in the Sichuan Basin and its periphery

    图  3  川东南地区上奥陶统五峰组—下志留统龙马溪组优质页岩段厚度、TOC、热演化程度、矿物含量综合对比

    Figure  3.  Comparison of thickness, TOC content, thermal evolution degree and mineral content in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the southeastern Sichuan Basin

    图  4  四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩差异抬升演化示意

    Figure  4.  Differential uplift evolution of the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  5  四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩段孔隙度与TOC、含气量相关性

    Figure  5.  Correlation between porosity and TOC and gas contents in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  6  四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩段孔隙度与含气量平均值

    Figure  6.  Average values of porosity and gas content in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  7  四川盆地上奥陶统五峰组—下志留统龙马溪组海相优质页岩孔隙度随埋深的变化规律

    Figure  7.  Variation pattern of porosity with buried depth in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  8  四川盆地不同埋深条件下上奥陶统五峰组—下志留统龙马溪组优质页岩储层有机质孔隙发育形态对比

    Figure  8.  Comparison of the development morphology of organic matter pores in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  9  四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩段储层孔径分布

    Figure  9.  Reservoir pore size distribution in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  10  四川盆地下志留统龙马溪组页岩硅质演化及孔隙发育模式

    Figure  10.  Siliceous evolution and pore development models of shale in the Lower Silurian Longmaxi Formation in the Sichuan Basin

    图  11  川东南不同地层压力条件下上奥陶统五峰组—下志留统龙马溪组优质页岩段孔隙度变化

    Figure  11.  Changes in porosity of the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation under different formation pressure conditions in the southeastern Sichuan Basin

    表  1  川东南上奥陶统五峰组—下志留统龙马溪组优质页岩段储层孔隙度、含气量及压力系数

    Table  1.   Reservoir porosity, gas content and pressure coefficient of the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the southeastern Sichuan Basin

    钻井名称 页岩埋深/m 孔隙度/% 含气量/(m3/t) 压力系数
    JY2井 2 575 6.20 6.46 1.55
    XY1井 3 650 6.05 5.95 1.90
    DYS2井 4 278 7.40 6.69 2.06
    PS1井 5 969 5.22 7.44 1.95
    下载: 导出CSV
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    [24] 王强, 魏祥峰, 魏富彬, 等. 川东南涪陵地区五峰组—龙马溪组页岩气藏中的超压作用[J]. 石油实验地质, 2019, 41(3): 333-340. doi: 10.11781/sysydz201903333

    WANG Qiang, WEI Xiangfeng, WEI Fubin, et al. Overpressure in shale gas reservoirs of Wufeng-Longmaxi formations, Fuling area, southeastern Sichuan Basin[J]. Petroleum Geology & Experiment, 2019, 41(3): 333-340. doi: 10.11781/sysydz201903333
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  • 收稿日期:  2023-03-26
  • 修回日期:  2023-06-03
  • 刊出日期:  2023-07-28

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