四川盆地筑竹寺组与龙马溪组页岩气地质条件及富集模式

Comparative study on geological conditions and models of shale gas enrichment in Qiongzhusi Formation and Longmaxi Formation in Sichuan Basin

摘要

四川盆地筇竹寺组页岩气富集模式认识不清。基于测录井数据、岩心铸体薄片观察、全岩 X 线衍射、总有机碳质量分数、有机质拉曼测定、孔隙度测试、场发射扫描电镜观察、大视域拼接及全孔径表征等实验方法，研究筇竹寺组与龙马溪组富有机质层段页岩气富集地质条件，分析筇竹寺组与龙马溪组页岩气富集控制参数，建立筇竹寺组与龙马溪组页岩气富集模式。结果表明：四川盆地筑竹寺组受多期沉积旋回控制，富有机质页岩纵向叠置厚度大，长石质量分数高，储集空间以无机质孔隙为主；裂缝发育程度低，以高角度裂缝为主。纵向上表现为多级封存箱结构封闭的富集模式；平面上表现为槽内原地滞留富集、槽缘一槽外原地滞留及侧向输导的富集模式。龙马溪组以有机质孔为主，裂缝发育程度高，主要发育高角度缝和层理缝，纵向为单一封存箱结构，自封闭富集。页岩气富集受优质页岩与超压系统协同控制。该结果为四川盆地深层一超深层与页岩气高效勘探提供指导。

Abstract

The understanding of the shale gas enrichment model of the Qiongzhusi Formation in the Sichuan Basin is not clear, which poses a challenge to its efficient development. Based on logging data, observation of cast thin sections of drilled cores, X-ray diffraction, organic carbon content(w(TOC)), organic matter raman measurement, porosity test, field emission scanning electron microscope observation, large-view splicing and full-aperture characterization experiments, the geological conditions of shale gas enrichment in organic-rich layers of Qiongzhusi Formation and Longmaxi Formation were studied. The differences of shale gas enrichment control parameters between Qiongzhusi Formation and Longmaxi Formation were analyzed, and the shale gas enrichment model of Qiongzhusi Formation was established. The results show that the Qiongzhusi Formation is controlled by multi-stage sedimentary cycles. The organic-rich shale has a large vertical stacking thickness, high feldspar content(w(feldspar mineral)), and the reservoir space is dominated by inorganic pores. The degree of fracture development is low, mainly high-angle fractures. Vertically, it shows a closed enrichment mode of multi-stage storage boxes system. On the plane, it shows the enrichment mode of in-situ retention and enrichment in the trough, in-situ retention outside the trough and lateral transport. The Longmaxi Formation is dominated by organic matter pores, and the fracture development degree is high. It mainly develops high-angle fractures and bedding fractures. The longitudinal direction is a single storage boxstructure and is self-enclosed and enriched. Shale gas enrichment is controlled by high-quality shale and overpressure system. The understandings provide guidance for the efficient exploration of shale gas in the deep-ultradeep Qiongzhusi Formation in Sichuan Basin.

关键词

页岩气 / 富集模式 / 富集地质条件 / 筑竹寺组 / 龙马溪组 / 四川盆地

Key words

shale gas / enrichment mode / enrichment geological conditions / Qiongzhusi Formation / Longmaxi Formation / Sichuan Basin

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基金资助

国家自然科学基金企业联合基金项目(U24A20592)