岩性油气藏 ›› 2025, Vol. 37 ›› Issue (1): 182–193.doi: 10.12108/yxyqc.20250116

• 地质勘探 • 上一篇    下一篇

黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组页岩气富集规律

吴松1, 冯冰2, 于继良3, 蓝宝锋4, 李龙2, 王胜2, 沈家宁1, 李刚权2   

  1. 1. 贵州乌江能源投资有限公司, 贵阳 550081;
    2. 贵州页岩气勘探开发有限责任公司, 贵州 遵义 563400;
    3. 贵州能源集团有限公司, 贵阳 550081;
    4. 贵州能源产业研究院有限公司, 贵阳 550025
  • 收稿日期:2023-04-05 修回日期:2023-05-17 出版日期:2025-01-01 发布日期:2025-01-04
  • 第一作者:吴松（1995—），男，硕士，高级工程师，主要从事非常规油气地质勘探方面的研究工作。地址：（550081）贵州省贵阳市观山湖区金阳北路233号。Email：1711913985@qq.com。
  • 通信作者: 沈家宁（1989—），男，硕士，高级工程师，主要从事非常规油气地质勘探开发方面的管理工作。Email:309423172@qq.com。
  • 基金资助:
    贵州省科技厅青年引导项目“黔北阳溪地区五峰组—龙马溪组页岩气储层含气性及富集规律研究”（编号：黔科合基础［-2024］青年379）、中央引导地方科技发展资金项目“贵州页岩气勘探开发科技创新基地”（编号：黔科中引地[2022]4024）与贵州省找矿突破战略行动重大协同创新项目“贵州省页岩气效益开发关键技术及工程试验”（编号：黔科合战略找矿［2022］ZD005）联合资助。

Shale gas enrichment law of Ordovician Wufeng Formation to Silurian Longmaxi Formation in Anchang syncline of Zheng’an area，northern Guizhou

WU Song1, FENG Bing2, YU Jiliang3, LAN Baofeng4, LI Long2, WANG Sheng2, SHEN Jianing1, LI Gangquan2   

  1. 1. Guizhou Wujiang Energy Investment Co., Ltd., Guiyang 550081, China;
    2. Guizhou Shale Gas Exploration and Development Co., Ltd., Zunyi 563400, China;
    3. Guizhou Energy Group Co., Ltd., Guiyang 550081, China;
    4. Guizhou Energy Industry Research Institute Co., Ltd., Guiyang 550025, China
  • Received:2023-04-05 Revised:2023-05-17 Online:2025-01-01 Published:2025-01-04

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摘要： 四川盆地外缘黔北地区具有良好的页岩气勘探开发前景。基于测井、录井及分析化验等资料，对黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组页岩气储层特征及富集规律进行了分析。研究结果表明：①黔北正安地区安场向斜奥陶系五峰组—志留系龙马溪组岩性主要为硅质页岩与硅质岩，孔隙类型主要为有机孔隙及粒间孔、粒内溶孔、晶间孔等无机孔隙与页理缝和构造缝及微裂缝等。岩石中总有机碳（TOC）为0.34%～6.65%，平均为3.69%，纵向上自下而上总体呈先增大后减小的趋势，平面上在向斜核部的TOC含量较高，呈环带状向四周降低。岩心含气的质量体积为1.6～6.2 m3/t，平均为3.9 m3/t，龙马溪组总含气量垂向上随着深度的增加而增加，平面上从向斜中部向南北两端逐渐降低，从向斜核部向两翼逐渐降低。矿物脆性指数总体较高，具有很好的可压裂性。②研究区五峰组—龙马溪组为“陆棚边缘、改造残留、向斜浅埋”的独特地质背景，其有利的沉积环境及古生产力为页岩气富集成藏奠定了基础，良好的保存条件避免了页岩储层中天然气的大量逸散，上覆的新滩组盖层与下伏的宝塔组底板形成了“上盖下堵”的封堵组合。③盆外残余向斜页岩气在向斜中心明显富集，核部是页岩气聚集的有利位置，两翼低角度逆断层遮挡处也是页岩气的有利富集部位，微裂缝的发育有利于页岩气的聚集与稳产，因此中浅层残余向斜的井位部署应重点考虑“宽、缓、深”的核心部位。

关键词: 页岩气, 储层特征, 脆性指数, 上盖下堵, 断层遮挡, 核部富集, 奥陶系五峰组—志留系龙马溪组, 安场向斜, 黔北地区

Abstract: There are good prospects for shale gas exploration and development in northern Guizhou area on the outer edge of Sichuan Basin. Based on wire-logging，mud-logging，and analytical data，the characteristics and enrichment law of shale gas reservoirs of Ordovician Wufeng Formation to Silurian Longmaxi Formation in Anchang syncline of Zheng’an area in northern Guizhou were analyzed. The results show that：（1）The lithologies of Ordovician Wufeng Formation to Silurian Longmaxi Formation in Anchang syncline of Zheng’an area in northern Guizhou are mainly composed of siliceous shale and siliceous rock，and the pore types are mainly organic pores， intergranular pores，intragranular dissolved pores，intercrystalline pores，as well as bedding fractures，structural fractures and micro-fractures. The total organic carbon（TOC）content in rocks ranges from 0.34% to 6.65%， with an average of 3.69%. It shows an overall trend of first increasing and then decreasing from bottom to top in the vertical direction. On the plane，it is higher in the syncline core and decreases in a circular band. The mass volume of gas in the rock core ranges from 1.6 to 6.2 m3/t，with an average of 3.9 m3/t. The total gas content of Longmaxi Formation increases vertically with depth，and gradually decreases from the middle of the syncline to the north and south ends in the plane，and from the syncline core to the two sides. The overall brittleness index of minerals is relatively high，indicating good fracturing ability.（2）The Wufeng Formation to Longmaxi Formation in the study area has a unique geological background of“shelf margin，reformed residue，and shallow syncline burial”. Its favorable sedimentary environment and paleoproductivity laid the foundation for shale gas enrichment and accumulation，good preservation conditions avoided the large-scale escape of natural gas in shale reservoirs，and the overlying Xintan Formation and the underlying Baota Formation formed a sealing combination of“upper cap and lower seal”.（3）The residual synclinal shale gas outside the basin is obviously enriched in the synclinal center， the core is a favorable location for shale gas accumulation，the low-angle reverse faults on both wings are also favorable enrichment areas for shale fas，and the development of micro-fractures is favorable for shale gas accumulation and stable production. Therefore，the core site of“wide，gentle and deep”should be considered first for the deployment of wells in middle-shallow residual synclines.

Key words: shale gas, reservoir characteristics, brittleness index, upper cap and lower seal, fault barria, enrichment in core, Ordovician Wufeng Formation to Silurian Longmaxi Formation, Anchang syncline, northern Guizhou

中图分类号: 

  • TE122.2
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