| 湘西北下寒武统牛蹄塘组页岩气储集条件研究 |
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| 引用本文： | 肖正辉,王朝晖,杨荣丰,冯涛,王齐仁,黄俨然,陈新跃,邓翼.湘西北下寒武统牛蹄塘组页岩气储集条件研究[J].地质学报,2013,87(10):1612-1623. |
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| 作者姓名： | 肖正辉 王朝晖 杨荣丰 冯涛 王齐仁 黄俨然 陈新跃 邓翼 |
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| 作者单位： | 湖南科技大学,湖南科技大学,湖南科技大学,湖南科技大学,湖南科技大学,湖南科技大学,湖南科技大学,湖南科技大学 |
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| 摘 要： | 为客观评价湘西北地区下寒武统牛蹄塘组页岩气资源勘探潜力，本研究利用X射线衍射仪（XRD）、高倍扫描电镜、扫描探针显微镜等系统研究了其页岩气储集条件。XRD分析结果表明, 泥页岩中脆性矿物含量为53.8%-98.1%, 平均77.9%，脆性矿物含量丰富，其高值区主要分布在张家界柑子坪、三岔及其周边地区。高倍扫描电镜分析结果显示，湘西北下寒武统牛蹄塘组泥页岩中发育残余原生孔隙、有机质微孔隙、不稳定矿物溶蚀孔、矿物层间微裂隙和构造裂缝，其中构造裂缝、有机质微孔隙和不稳定矿物溶蚀孔是页岩基质孔裂隙的主要组成部分。扫描探针显微镜分析结果显示，湘西北下寒武统牛蹄塘组泥页岩中蜂窝状的有机质丰富，主要呈分散状和条带状分布，其内部纳米级孔隙发育。Ultrapore-200A氦孔隙仪测试结果显示，湘西北下寒武统牛蹄塘组泥页岩孔隙度较低，为0.6%～11.7%，平均4.6%，其影响因素主要是构造裂缝，其次是泥页岩有机碳含量和长石含量。ULTRA-PERMTM200渗透率仪测试结果显示，湘西北下寒武统牛蹄塘组泥页岩的渗透率度较低，为 0.002mD~0.06mD，平均0.014mD，其影响因素主要是构造裂缝，其次是矿物层间微裂隙。等温吸附实验结果表明，湘西北下寒武统牛蹄塘组泥页岩具有较好的吸附气性能，其影响因素主要是有机碳含量，其次是粘土矿物含量。
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| 关 键 词： | 湘西北 下寒武统 牛蹄塘组 页岩气 储集条件 |
| 收稿时间： | 2/3/2013 12:00:00 AM |
| 修稿时间： | 4/8/2013 12:00:00 AM |
Reservoir conditions of shale gas in Lower Cambrian Niutitang Formation, northwestern Hunan |
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| Xiao Zhenghui,Wang Zhaohui,Yang Rongfeng,Feng Tao,WANG Qiren,Huang Yanran,CHEN Xinyue and DENG Yi.Reservoir conditions of shale gas in Lower Cambrian Niutitang Formation, northwestern Hunan[J].Acta Geologica Sinica,2013,87(10):1612-1623. |
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| Authors: | Xiao Zhenghui Wang Zhaohui Yang Rongfeng Feng Tao WANG Qiren Huang Yanran CHEN Xinyue and DENG Yi |
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| Institution: | Hunan University of Science and Technology,Hunan University of Science and Technology,Hunan University of Science and Technology,Hunan University of Science and Technology,Hunan University of Science and Technology,Hunan University of Science and Technology,Hunan University of Science and Technology,Hunan University of Science and Technology |
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| Abstract: | To objectively evaluate shale gas exploration potential in Lower Cambrian Niutitang Formation, northwestern Hunan, reservoir conditions of shale gas were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning probe microscopy (SPM) and so on. XRD analysis results showed that brittle mineral contents ranged from 53.8 percent to 98.1 percent, with an average content of 77.9 percent. High value zones of brittleness mineral contents were mainly distributed in the Zhangjiajie Ganziping, Sancha and the surrounding areas. High magnification SEM analysis results indicated that there existed five kinds of pores and fractures, including residual primary pores, organic micropores, dissolution pores in unstable minerals, interlayer microfracture in minerals, as well as tectonic fractures. Of which tectonic fractures, organic micropores, dissolution pores in unstable minerals were the main constituents of shale pores and fractures. SPM analysis results showed that honeycomb organic matters distributed mostly in strip-shaped and disperse states were rich in the mud-shale of Lower Cambrian Niutitang Formation, northwestern Hunan, and nanoscopic porosities were developed in organic matters. Test results of Ultrapore-200 helium porosimeter showed that porosity of mud-shale was low, with ranging from 0.6 percent to 11.7 percent and an average content of 4.6 percent. It was indicated that the dominant factor of porosity was tectonic fractures, followed by TOC contents and feldspar contents. Test results of ULTRA-PERMTM200 permeameter showed that permeability of mud-shale was low, with ranging from 0.002mD to 0.06mD and an average content of 0.014mD. It was indicated that the dominant factor of permeability was tectonic fractures, followed by interlayer microfracture in minerals. Isothermal adsorption experimental results showed that mud-shale of Lower Cambrian Niutitang Formation had good adsorbability. It was indicated that the dominant factor of mud-shale adsorption was TOC contents, followed by clay mineral contents. |
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| Keywords: | northwestern Hunan Lower Cambrian Niutitang Formation shale gas reservoir conditions |
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