| 雪峰古隆起边缘下寒武统牛蹄塘组页岩气成藏地质特征及有利区预测 |
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| 引用本文： | 彭中勤,田巍,苗凤彬,王保忠,王传尚.雪峰古隆起边缘下寒武统牛蹄塘组页岩气成藏地质特征及有利区预测[J].地球科学,2019,44(10):3512-3528. |
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| 作者姓名： | 彭中勤 田巍 苗凤彬 王保忠 王传尚 |
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| 作者单位： | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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| 基金项目： | 中国地质调查局地质调查项目DD20160179 |
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| 摘 要： | 雪峰古隆起边缘下寒武统牛蹄塘组页岩具有良好的生烃和储集条件，是重要的页岩气勘探层位，但受多期构造运动改造，页岩气保存条件复杂，页岩气勘探一直未获突破.基于野外地质调查、钻探资料，结合有机地化分析测试等手段，对雪峰古隆起边缘即沅麻盆地及周缘下寒武统牛蹄塘组页岩气地质条件和勘探前景进行综合评价.研究表明:牛蹄塘组沉积于深水陆棚相，页岩有机碳含量TOC值普遍大于2.0%，一般在3.0%~5.0%之间；有机质类型为Ⅰ型；有机质成熟度2.17%~3.38%之间，平均为2.79%；页岩碎屑矿物平均含量77.25%；粘土矿物平均含量22.71%，硅质含量高，脆性较大，易于储层改造.综合地化、储层物性及保存条件等评价指标，提出沅麻盆地草堂凹陷及古隆起北缘凤凰-吉首-张家界一带为牛蹄塘组页岩气勘探有利区带.
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| 关 键 词： | 雪峰古隆起 页岩气 牛蹄塘组 下寒武统 地质特征 |
| 收稿时间： | 2019-09-02 |
Geological Features and Favorable Area Prediction of Shale Gas in Lower Cambrian Niutitang Formation of Xuefeng Ancient Uplift and Its Periphery |
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| Abstract: | The Lower Cambrian Niutitang Formation shale at the edge of Xuefeng ancient uplift is favorable for hydrocarbon generation and accumulation, and it is an important shale gas exploration target bed. But the preservation conditions of shale gas are very complex due to multistage tectonic activities, and no breakthrough has been made in shale gas exploration. Based on field geological survey and drilling data, combined with organic geochemistry analysis and test, it made a comprehensive evaluation of shale gas geological conditions and exploration prospect of the Lower Cambrian Niutitang Formation at the edge of the Xuefeng ancient uplift, namely the Yuanma basin. Results show that the Niutitang Formation is mainly composed of deep-shelf deposits, the organic carbon content is generally more than 2.0% and between 3.0% and 5.0%, and the organic matter type is type Ⅰ. The maturity of organic matter is 2.17% to 3.38%, with an average of 2.79%. The average content of shale debris minerals is 77.25%, and the average clay mineral content is 22.71%. Due to the high silicon content and brittleness, the reservoir reformation is easy. Based on comprehensive evaluation indexes such as geochemistry, reservoir property and preservation conditions, it is proposed that the Caotang sag and Fenghuang-Jishou-Zhangjiajie belt at the northwestern edge of the ancient uplift are favorable for Niutitang Formation shale gas exploration. |
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