黔西北燕子口地区五峰-龙马溪组页岩气源岩评价
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P618.12

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贵州省科技合作计划项目(黔科合LH字[2017]7017,[2016]7050,[2015]7590);贵州省科技计划项目(黔科合基础[2017]1407);高层次人才科研启动基金项目(院科合字G2017006);贵州省青年科技人才成长项目(黔教合KY字[2016]283)


The evaluation of shale gas source rocks in Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation of Yanzikou area, northwest Guizhou
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    摘要:

    黔西北上奥陶统五峰组-下志留统龙马溪组具有巨大的页岩气资源潜力,是我国南方页岩气勘探主攻目的层位和地区之一。本文研究了黔西北燕子口地区该套地层横向范围和厚度以及埋藏深度、岩相特征、矿物组成、总有机碳含量、热成熟度、储集空间和物性等页岩气成藏关键特征,结果表明:五峰组在燕子口西部的以勒地区厚度可达20 m,而龙马溪组自黔中隆起往北厚度逐渐增大,至四川丁木坳-大坪一线厚度达250 m以上;有效烃源岩主要分布在五峰组-龙马溪组下段,包括粘土页岩、粉砂质页岩和钙质页岩几种岩相类型,主要由粘土矿物、石英、碳酸盐矿物组成,其高岩石脆性指数(47.3%~76.8%)显示良好的可压裂性;可识别出裂缝、溶蚀孔、粒间孔、晶间孔等储集空间,其中溶蚀孔隙和裂缝占主导,储层孔隙度高,比表面积(13.4~24.9 m2/g)与总有机碳含量之间呈现良好的正相关性;地球化学分析表明,富有机质页岩段有机质类型好(Ⅰ型-Ⅱ1型),具有高有机质丰度(TOC平均值为2.56%)和有机质成熟度(Ro值为2.5%)。综合研究认为,燕子口地区以北与川东南古蔺-叙永一线接壤区带为五峰组-龙马溪组页岩气较为有利的勘探潜力区域。

    Abstract:

    The Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation is one of the main targets for shale gas exploration in southern China. In this paper, the authors studied the thickness and burial depth of the black shale in Yanzikou area of northwestern Guizhou and its key features of shale gas accumulation such as lithofacies characteristics, mineral composition, total organic carbon content, thermal maturity, storage space and physical properties.The results are as follows:① The thickness of the Wufeng Formation can reach 20 m in western Yile area, while that of the Longmaxi Formation gradually increases from Qianzhong uplift northward, and its maximum thickness is over 250 m in Dingmu'ao-Daping area; ② Effective source rocks are mainly distributed in the lower part of Wufeng Formation and Longmaxi Formation, consisting of clay shale, silty shale and calcareous shale. They are mainly composed of clay minerals, quartz and carbonate minerals with high rock brittleness index (47.3%~76.8%), showing good fracturing ability; ③ Fractures, dissolved pores, intergranular pores, and intercrystalline pores can be identified by SEM, among which dissolved pores and fractures are the main reservoir space. The reservoir has high porosity and shows a good correlation between the BET(13.4~24.9 m2/g) and the total organic carbon content; ④ Geochemical analysis shows that the organic-rich shale section has good types of organic matter, with high organic carbon content (2.56% on average) and organic matter maturity (Ro=2.5%). According to comprehensive research, the north of Yanzikou area and the Gulin-Xuyong border area in southeastern Sichuan is a fairly favorable exploration potential area for Wufeng-Longmaxi shale gas.

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兰叶芳,任传建,黄喻,陈豪,任戍明,2021,黔西北燕子口地区五峰-龙马溪组页岩气源岩评价[J].岩石矿物学杂志,40(1):49~64.

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  • 收稿日期:2020-08-10
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  • 在线发布日期: 2021-01-16
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