| 紫金山地区煤系致密砂岩储层特征及主控因素 |
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| 引用本文： | 孙泽飞,史建儒,连碧鹏,康志帅,申建,杨函.紫金山地区煤系致密砂岩储层特征及主控因素[J].吉林大学学报(地球科学版),2019,49(4):959-969. |
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| 作者姓名： | 孙泽飞 史建儒 连碧鹏 康志帅 申建 杨函 |
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| 作者单位： | 1. 山西省地质矿产科技评审中心, 太原 030024;2. 山西省自然资源厅油气资源开发管理处, 太原 030024;3. 煤层气资源与成藏过程教育部重点实验室(中国矿业大学), 江苏 徐州 221008 |
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| 基金项目： | 国家科技重大专项项目（2011ZX0503-01-02）；国家自然科学基金项目（U1361207） |
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| 摘 要： | 鄂尔多斯盆地东北缘紫金山地区上古生界煤系致密砂岩气资源潜力大，是我国当前非常规天然气勘探的重要地区之一。通过铸体薄片、扫描电镜、孔渗测试和压汞实验等分析测试，结合钻井和测井资料，分析了致密储层的岩石学、孔隙、物性和含气性特征。结果表明：紫金山地区煤系砂岩储层以岩屑砂岩为主，石英和岩屑体积分数高，长石体积分数低，成分成熟度和结构成熟度中等；孔隙类型以溶蚀孔为主，孔隙结构以中孔细喉和小孔细喉为主；孔隙度主要分布在2.00%~12.00%之间，平均6.96%；渗透率主要为0.01×10-3~1.00×10-3 μm2，平均为0.36×10-3 μm2，孔渗相关性较好，与后期溶蚀作用有关；含气储层平均厚度为10.3 m，占砂岩储层总厚度的29%，含气饱和度为40.4%。储层发育主要受沉积作用、压实作用和溶蚀作用控制，沉积作用控制了储层形成的物质基础和空间展布，不同环境下沉积的岩石成分直接影响了压实作用的强弱，砂岩、泥岩、煤层叠置发育的特征为溶蚀作用奠定了基础；压实作用是造成储层致密的最主要因素；溶蚀作用是区内储层物性改善的决定性因素；紫金山岩浆热作用和喷发作用进一步加强了溶蚀作用。
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| 关 键 词： | 致密砂岩 储层 主控因素 太原组 山西组 紫金山 鄂尔多斯盆地 |
| 收稿时间： | 2018-05-16 |
Reservoir Characteristics and Main Controlling Factors of Tight Sandstone in Coal Measures in Zijinshan Area |
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| Sun Zefei,Shi Jianru,Lian Bipeng,Kang Zhishuai,Shen Jian,Yang Han.Reservoir Characteristics and Main Controlling Factors of Tight Sandstone in Coal Measures in Zijinshan Area[J].Journal of Jilin Unviersity:Earth Science Edition,2019,49(4):959-969. |
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| Authors: | Sun Zefei Shi Jianru Lian Bipeng Kang Zhishuai Shen Jian Yang Han |
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| Institution: | 1. Shanxi Geology and Mineral Resources of Science and Technology Evaluation Center, Taiyuan 030024, China;2. Oil and Gas Resources Development and Management Department, Department of Natural Resources of Shanxi Province, Taiyuan 030024, China;3. Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process(China University of Mining & Technology), Ministry of Education, Xuzhou 221008, Jiangsu, China |
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| Abstract: | The Upper Paleozoic tight sandstone gas resources are rich in potential in Zijinshan area at the northeast margin of Ordos basin,and are one of the important blocks for unconventional natural gas exploration in China. The petrology, physical properties and gas-bearing characteristics of tight reservoirs were studied through analysis and test of casting thin sections, scanning electron microscope, experiments on porosity,permeability,and pressured-mercury testing,combined with drilling and logging data. The results show that lithic sandstone is the main reservoir rock type at medium degree of composition maturity and textural maturity with high content of quartz,lithic fragment,and low content of feldspar. The dissolved pore is the major type of reservoir space,and its main pore structure is mesoporous fine throat and microporous fine throat. The porosity of the major pores ranges from 2.00% to 12.00%, with an average of 6.96%,and the main permeability is 0.01×10-3 μm2-1.00×10-3 μm2, with an average of 0.36×10-3 μm2. The correlation of porosity and permeability is good because of the later dissolution. The average thickness of the gas reservoirs with gas saturation of 40.4% is 10.3 m, which accounts for 29% of the tight sandstone reservoirs. The reservoir development is mainly under the control of sedimentation, compaction and dissolution. The material basis and spatial distribution of reservoir formation are controlled by sedimentation. The strength of compaction is directly affected by rock composition in different sedimentary environments. The superimposed development characteristics of sandstone, mudstone, limestone,and coal seam provide a basis for dissolution. Compaction is the main factor that causes reservoir tightness. Dissolution is the decisive factor for the improvement of reservoir properties in the region. The thermal action and eruption of Zijinshan magma enhanced the dissolution. |
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| Keywords: | tight sandstone reservoir main controlling factors Taiyuan Formation Shanxi Formation Zijinshan Ordos basin |
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