| 阿尔金山前下—中侏罗统页岩气成藏地质条件分析 |
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| 作者姓名： | 陈夷 杜治利 康志宏 田亚 |
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| 作者单位： | 1.中国地质调查局油气资源调查中心,北京 100083;2.中国地质大学(北京)能源学院,北京 100083 |
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| 基金项目： | 中国地质调查局“武威-民乐盆地油气基础地质调查(编号: DD20160171)”“塔里木盆地西南与东南坳陷油气基础地质调查(编号: DD20160169)”和“陆域油气资源战略选区与评价(编号: DD20190117)”项目联合资助 |
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| 摘 要： | 阿尔金山前侏罗系出露大套厚层的暗色泥页岩,生烃潜力优越,具备陆相页岩气形成条件,是有利的勘探接替区。通过野外地质调查、样品采集和测试分析,研究下—中侏罗统泥页岩的沉积展布、有机地球化学特征及储集性能,并探讨了该区页岩气的勘探潜力。研究表明: 富有机质泥页岩主要处于滨浅湖—半深湖相、沼泽相沉积环境中,其在平面上呈NE向展布,单层厚度和累计厚度均较大; 泥页岩的有机质类型主要为Ⅱ1、Ⅱ2型干酪根; TOC含量为0.55%~10%,平均为2.28%; 镜质体反射率(Ro)为1.0%~1.6%,平均为1.269%,处于成熟—高成熟阶段,为页岩气藏形成提供良好的生烃条件; 其矿物特征表现为脆性矿物含量高,大于51%,有利于后期的水力压裂改造和页岩气开采; 通过扫描电镜观察,泥页岩储层发育微孔隙及微裂缝,为页岩气提供了良好的储集空间和运移通道。初步预测,后期改造相对较弱的月牙山地区为页岩气勘探的有利目标区。
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| 关 键 词： | 页岩气 下-中侏罗统 成藏地质条件 勘探潜力 阿尔金山前 |
| 收稿时间： | 2019-04-22 |
Analysis on geological conditions of shale gas accumulation in Lower-Middle Jurassic strata of Southern Altyn Tagh |
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| Authors: | CHEN Yi DU Zhili KANG Zhihong TIAN Ya |
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| Institution: | 1. Oil & Gas Survey, China Geological Survey, Beijing 100083, China;2. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China |
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| Abstract: | There are some thick layers of dark muddy-shale in Jurassic strata of Southern Altyn Tagh, which have high hydrocarbon potential and formation conditions of continental shale gas. So this area is an advantageous succession area for exploration. Based on the field geological investigation and sample collection and test,the distribution of Lower-Middle Jurassic sedimentary facies, organic geochemical characteristics, reservoir properties and exploration potential of shale gas in this area have been discussed in this paper. Organic rich shales were mainly developed in the shallow-deep lake and swamp environment. The shales distribute as NE trending with large single-layer and cumulative thickness. The kerogen types of organic matter are mainly Ⅱ1 and Ⅱ2. The total organic carbon (TOC) content varies from 0.55% to 10%, with the average of 2.28%. RO varies from 1% to 1.6%, with the average of 1.269%, from mature stage to high mature stage. These are the good hydrocarbon generating conditions for shale gas reservoir. The shales are characterized as high content of brittle minerals, more than 51%, which are conducive to hydraulic fracturing and shale gas exploitation. Shale reservoir developed micro pore and fracture that were shown under scanning electron microscope, which provided space and great migration channel for shale gas. For preliminary forecast, Yueyashan region with relatively weak rock deformation is favorable exploration area of shale gas. |
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| Keywords: | shale gas Lower-Middle Jurassic reservoir-forming geological conditions exploration potential Southern Altyn Tagh |
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