渝东南地区五峰组-龙马溪组页岩气成藏地质条件与有利区预测
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国家重点基础研究发展计划(973计划)


Geological condition of shale gas accumulation and the favorable area prediction for Wufeng-Longmaxi formation in Southeastern Chongqing
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    摘要:

    五峰组-龙马溪组是四川盆地页岩气勘探的重要层位。通过地层厚度、地层埋深、总有机碳含量、有机质类型、有机质成熟度及储层含气量等参数的综合分析,表明渝东南地区五峰组-龙马溪组具有泥页岩厚度大(40~210m)、地层埋深较浅(<4500m)、总有机碳含量较高(TOC一般>1.5%)、有机质成熟度高(Ro为1.9~2.7%)等特点,有机质类型多以Ⅰ型为主,现场解吸含气量在五峰组及龙马溪组中下部具有较好的水平。综合分析认为,五峰组-龙马溪组具有较好的页岩气成藏地质潜力。运用多因素叠加及综合地质分析技术,选取总有机碳含量、热成熟度、地层埋深、地层厚度、地表条件5个参数作为核心评价指标对渝东南地区五峰组-龙马溪组的成藏有利区进行了预测,共预测出Ⅰ类有利区6个,Ⅱ类有利区2个,有利区预测结果与目前已有钻井的含气量水平相一致。最后,提出了“有重点、有先后、分层次”的勘探开发部署建议。

    Abstract:

    Wufeng-Longmaxi is an important formation in Sichuan Basin for shale gas exploration. Through comprehensive analysis of the geological parameters of stratigraphic thickness, buried depth, total organic carbon content, types of organic matter, organic matter maturation and gas content, indicates that there are big shale thickness(40-210m), shallow buried depth(<4500m), high total organic carbon content(TOC >1.5%) and high organic matter maturity(Ro=1.9-2.7%) in Wufeng-Longmaxi formation; Moreover, the type of organic matter is mainly in type Ⅰand the field desorption gas content in the lower and middle part of Wufeng-Longmaxi formation has a good level. In a word, Wufeng-Longmaxi formation has good potential for shale gas accumulation. Using multi-factor superposition and comprehensive geological analysis method, selected total organic carbon, thermal maturity, the buried depth, stratigraphic thickness and the surface condition as the core evaluation index for the favorable accumulation area prediction, 6 classⅠ and 2 class Ⅱ favorable areas are classified for Wufeng-Longmaxi formation. The prediction results accordance with the existing drilling gas content, confirmed the feasibility of the evaluation method and the evaluation results. Finally, this paper put forward a exploration and development proposal that “focused, priority and hierarchical”.

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谭淋耘,徐铫,李大华,程礼军,曾春林.2015.渝东南地区五峰组-龙马溪组页岩气成藏地质条件与有利区预测[J].地质学报,89(7):1308-1317.
tanlinyun, Xu Yao, Li Dahua, Cheng Lijun, Zeng Chunlin.2015. Geological condition of shale gas accumulation and the favorable area prediction for Wufeng-Longmaxi formation in Southeastern Chongqing[J]. Acta Geologica Sinica,89(7):1308-1317.

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  • 收稿日期:2014-09-11
  • 最后修改日期:2015-01-13
  • 录用日期:2015-01-14
  • 在线发布日期: 2015-07-09
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