鄂西地区陡山沱组页岩气成藏地质条件研究
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本文为中国地质调查局项目“湘鄂西元古界页岩气基础地质调查”(编号:12120115004801)资助的成果。


Study on the Accumulation Conditions of Shale Gas in Doushantuo Formation in Western Hubei
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    摘要:

    在野外地质露头观察的基础上,通过地球化学分析测试、扫描电镜、X衍射、低温氮气吸附、等温吸附等分析测试,对鄂西地区陡山沱组暗色泥页岩的发育分布、有机地球化学特征、储层特征及吸附性能等页岩气成藏地质条件进行了研究。结果表明,研究区陡山沱组发育厚层暗色泥页岩,且区域分布稳定,具有有机质丰度较高,有机质类型好,热演化程度高,脆性矿物丰富,物性良好,储层孔隙空间发育,吸附性能好等特点,且具有较好的保存条件,具备页岩气聚集成藏的有利地质条件。通过综合信息叠合法,认为鄂西地区黄陵背斜南翼及长阳背斜地区为页岩气勘探有利区带,陡山沱组陡二段中下段为页岩气勘探有利目的层段。

    Abstract:

    Objectives: The dark shale layer of the Neoproterozoic Doushantuo Formation is extensively developed in the western Hubei. The well gas show of the ZD1 and EYY1 well reveals that the dark shale has good shale gas potential, but the degree of research is relatively low. This paper will provide a scientific basis for the exploration and development of shale gas in the Neoproterozoic Doushantuo Formation. Methods: Based on comprehensive analysis of outcrops observation, combining with analysis of organic geochemical test,SEM,X-ray diffraction, low-temperature nitrogen adsorption—desorption and isothermal adsorption, this paper studied the shale gas accumulation conditions and characteristics of the Doushantuo Formation in West of Hubei, such as the development and distribution of the shale, the organic geochemical characteristics, reservoir characteristics and the ability of adsorption of the shale. Results: The continuous dark shale is developed in the Doushantuo Formation in western Hubei, with the thickness is about between 50m and 90m. The TOC content of the shale is higher, as the value is about between 1.0% and 2.5%. The type of organic matter is Ⅰ, and the vitrinite reflective is about between 1.8% and 2.2%, which means higher—over mature stage. The mean brittle minerals content of the dark shale of the Doushantuo Formation is about 52.3%, which is conducive to fracturing development. The dark shale is highly compacted. The shale reservoir pore space is widely developed, with high specific surface area and pore volume. The adsorption ability of the dark shale is better, which methane maximum adsorption capacity is about between 1.68 cm 3/g and 2.1 cm3/g. Conclusions: The development of the dark shale in Doushantuo Formation is widely and regional stable. The dark shale is characterized with abundance of organic matter, good organic type, high degree of thermal evolution, brittle minerals wealth, better reservoir physical properties, more type of reservoir pore space, and better ability of methane adsorption. It means the advantageous geological conditions of shale gas enrichment and accumulation. The most favorable area for shale gas accumulation in the Doushantuo Formation shale is the South area of Huangling anticline and Changyang anticline area, furthermore, the most favorable section is the lower part of the second layer in Doushantuo formation, with the method of comprehensive information superposition.

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彭波,刘羽琛,漆富成,东艳,王振云.2017.鄂西地区陡山沱组页岩气成藏地质条件研究[J].地质论评,63(5):1293-1306,[DOI].
PENG Bo, LIU Yuchen, QI Fucheng, DONG Yan, WANG Zhenyun.2017. Study on the Accumulation Conditions of Shale Gas in Doushantuo Formation in Western Hubei[J]. Geological Review,63(5):1293-1306.

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  • 收稿日期:2016-12-19
  • 最后修改日期:2017-06-16
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  • 在线发布日期: 2017-09-13
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