| 鄂西建始-长阳地区上二叠统大隆组储层特征及沉积环境 |
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| 引用本文： | 周向辉,许露露,温雅茹,刘早学,陈程,罗凡.鄂西建始-长阳地区上二叠统大隆组储层特征及沉积环境[J].华南地质与矿产,2019,35(2):244-253. |
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| 作者姓名： | 周向辉 许露露 温雅茹 刘早学 陈程 罗凡 |
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| 作者单位： | 湖北省地质调查院,武汉,430034;湖北省地质调查院,武汉,430034;湖北省地质调查院,武汉,430034;湖北省地质调查院,武汉,430034;湖北省地质调查院,武汉,430034;湖北省地质调查院,武汉,430034 |
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| 基金项目： | 湖北省页岩气勘探区块评价优选项目 |
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| 摘 要： | 前人对鄂西地区大隆组页岩气资源潜力调查评价较少。本文通过研究区地层剖面测量及钻探等方法,对大隆组储层特征及沉积环境进行了分析。结果表明,大隆组纵向上可分为三段,横向上有由西向东厚度减薄的趋势。大隆组有机质类型主要为腐泥型,热演化处于过成熟阶段,TOC值含量较高且非均质性分布特征明显。大隆组矿物成分以长英质矿物为主,属于低孔-特低孔特低渗储层。微量元素分析显示大隆组下段处于厌氧环境,上段处于富氧环境。TOC变化曲线与V/(V+Ni)和Ni/Co所指示的氧化还原条件具明显相关性,厌氧环境TOC含量高。综合研究表明,西部建始一带为页岩气成藏有利区,大隆组下段为有利的勘探层位。
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| 关 键 词： | 鄂西 大隆组 页岩气 储层特征 沉积环境 微量元素 地化指标 |
Reservoir Characteristics and Sedimentary Environment of Permian Dalong Formation in Jianshi-Changyang Area of Western Hubei Province |
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| ZHOU Xiang-Hui,XU Lu-Lu,WEN Ya-Ru,LIU Zao-Xue,CHEN Cheng,LUO Fan.Reservoir Characteristics and Sedimentary Environment of Permian Dalong Formation in Jianshi-Changyang Area of Western Hubei Province[J].Geology and Mineral Resources of South China,2019,35(2):244-253. |
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| Authors: | ZHOU Xiang-Hui XU Lu-Lu WEN Ya-Ru LIU Zao-Xue CHEN Cheng LUO Fan |
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| Institution: | (Hubei Institute of Geological Survey,Wuhan 430034,Hubei,China) |
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| Abstract: | Previous studies on the potential of shale gas resources in Dalong Formation in Western Hubei Province have been few. In this paper, the reservoir characteristics and sedimentary environment of Dalong Formation are analyzed by means of stratum profile survey and drilling in the study area. The results show that the Dalong Formation can be divided into three sections vertically and the thickness tends to decrease from west to east horizontally. The organic matter type of Dalong Formation is mainly sapropelic, and the thermal evolution is in the over-mature stage. The TOC value is high and the heterogeneous distribution characteristics are obvious. The mineral composition of Dalong Formation is mainly felsic mineral, which belongs to low-porosity and ultra-low-porosity and ultra-low permeability reservoir. Trace element analysis shows that the lower part of Dalong Formation is in anaerobic environment and the upper part is in oxygen-rich environment. The variation curve of TOC was significantly correlated with the redox conditions indicated by V/(V+Ni) and Ni/Co, and the TOC content in anaerobic environment was high. Comprehensive study shows that the western Jianshi area is a favorable area for shale gas reservoir formation and the lower part of Dalong Formation is a favorable position for exploration. |
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| Keywords: | Western Hubei Province Dalong Formation shale gas reservoir characteristics sedimentary environment trace elements geochemistry index |
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