| 皖南地区二叠系孤峰组页岩中高密度含甲烷包裹体特征及其地质意义 |
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| 引用本文： | 董敏,王宗秀,董会,张林炎,宋微,郭迎春,李小诗,冯兴强,马立成,季长军.皖南地区二叠系孤峰组页岩中高密度含甲烷包裹体特征及其地质意义[J].地质力学学报,2020,26(6):872-880. |
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| 作者姓名： | 董敏 王宗秀 董会 张林炎 宋微 郭迎春 李小诗 冯兴强 马立成 季长军 |
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| 作者单位： | 1.中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | 国家自然科学基金项目（41672201）；中国地质调查局地质调查项目（DD20190085） |
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| 摘 要： | 对皖南地区泾县昌桥剖面的二叠系孤峰组硅质页岩裂缝石英脉中流体包裹体进行了显微激光拉曼光谱测试、热力学温度测定及拉曼光谱图谱解析，观测到了高密度甲烷包裹体。利用甲烷包裹体的拉曼散射峰v1位移2910.6~2911.2 cm-1，计算得到甲烷包裹体密度为0.2295~0.2618 g/cm3，具有高密度甲烷包裹体特征。含甲烷组分的气液两相盐水包裹体均一温度分布在216.8~242.3℃。由于气液两相盐水包裹体与甲烷包裹体是共生的，通过状态方程热力学计算高密度甲烷包裹体在共生气液两相盐水包裹体最小温度216.8℃的捕获压力为76~95 MPa。对甲烷流体包裹体密度和捕获压力的计算，揭示了区域内二叠系孤峰组高演化程度的硅质页岩在地史演化过程中存在高压甲烷流体产出的证据，为开展皖南地区二叠系页岩气勘探评价提供了科学依据。
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| 关 键 词： | 皖南地区 二叠系孤峰组 高密度甲烷包裹体 激光拉曼光谱分析 |
| 收稿时间： | 2020/9/24 0:00:00 |
| 修稿时间： | 2020/10/29 0:00:00 |
The characteristics and geological significance of highdensity methane-bearing inclusions in the Permian Gufeng Formation shale, southern Anhui |
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| DONG Min,WANG Zongxiu,DONG Hui,ZHANG Linyan,SONG Wei,GUO Yingchun,LI Xiaoshi,FENG Xingqiang,MA Licheng,JI Changjun.The characteristics and geological significance of highdensity methane-bearing inclusions in the Permian Gufeng Formation shale, southern Anhui[J].Journal of Geomechanics,2020,26(6):872-880. |
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| Authors: | DONG Min WANG Zongxiu DONG Hui ZHANG Linyan SONG Wei GUO Yingchun LI Xiaoshi FENG Xingqiang MA Licheng JI Changjun |
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| Institution: | 1.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China2.Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijing 100081, China3.Key Laboratory of Petroleum Geomechanics, Chinese Geological Survey, Beijing 100081, China4.Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shannxi, China5.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
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| Abstract: | Samples of quartz veins were collected from the Permian Gufeng Formation siliceous shale fractures along the Changqiao profile,Jingxian County in southern Anhui. Inclusion composition analysis,thermodynamic temperature measurement,and laser Raman spectroscopy were carried out on the samples,and high-density methane inclusions were detected. The measured displacements of laser Raman scattering peak v1 of the inclusions vary from 2910.6~2911.2 cm-1,and densities of the methane inclusions were calculated as 0.2295~0.2618 g/cm3,indicating characteristics of high-density methane inclusions. The two-phase vapor-liquid brine inclusions coexisting with the methane inclusions have homogenization temperatures ranging from 216.8 ℃ to 242.3 ℃. The combination of methane inclusion composition by laser Raman spectroscopy with the simulation of high-density methane inclusions using the equation of state of supercritical methane system shows that the trapping pressure at 216.8 ℃ was 76~95 MPa. By calculating the density of the high-density methane inclusion and the capture pressure,it reveals the evidence for high-pressure methane yield in the Permian Gufeng Formation highly evolved siliceous shale in geological history,and provides scientific grounds for the exploration and evaluation of Permian shale gas in southern Anhui. |
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| Keywords: | southern Anhui Permian Gufeng Formation high-density methane inclusions laser Raman spectroscopy |
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