| 四川盆地东南缘下志留统龙马溪组页岩基本特征 |
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| 引用本文： | 马文辛,刘树根,黄文明,张长俊,曾祥亮,王佳.四川盆地东南缘下志留统龙马溪组页岩基本特征[J].地质科学,2012,47(2):406-421. |
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| 作者姓名： | 马文辛 刘树根 黄文明 张长俊 曾祥亮 王佳 |
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| 作者单位： | 1. 成都理工大学油气藏地质及开发工程国家重点实验室 成都 610059;2. 中石油川庆钻探工程有限公司地质勘探开发研究院 成都 610051 |
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| 基金项目： | 国家重点基础研究发展计划"973"项目 |
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| 摘 要： | 下志留统龙马溪组是四川盆地东南缘最为重要的烃源岩和页岩气勘探层位之一.在岩石学研究的基础上,利用岩石热解、色谱-质谱等分析技术,对研究区龙马溪组页岩地球化学特征进行了系统分析.龙马溪组厚为60 ～ 420 m,主要由8种岩性构成:层状-非层状泥/页岩、白云质粉砂岩、层状钙质泥页岩、泥质粉砂岩、层状-非层状粉砂质泥/页岩...
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| 关 键 词： | 龙马溪组 页岩气 川东南 鄂西渝东 地球化学 |
| 收稿时间： | 2011-09-23 |
| 修稿时间： | 2011-09-23; |
Basic characteristics of Lower Silurian Longmaxi Formation in SE margin of Sichuan Basin |
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| Ma Wenxin
,
Liu Shugen
,
Huang Wenming
,
Zhang Changjun
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Zeng Xiangliang
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Wang Jia.Basic characteristics of Lower Silurian Longmaxi Formation in SE margin of Sichuan Basin[J].Chinese Journal of Geology,2012,47(2):406-421. |
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| Authors: | Ma Wenxin Liu Shugen Huang Wenming Zhang Changjun Zeng Xiangliang Wang Jia |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059;2. Geological Exploration & Development Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051 |
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| Abstract: | Lower Silurian Longmaxi Formation is one of the most important source rocks and shale gas exploration beds.Using the rock eval,chromatography-mass spectrometry,and other analytical techniques,the geochemical characteristics of Longmaxi Formation has been systematically analyzed based on the studies of petrographic features.The thickness of Longmaxi Formation ranges from 60 m to 420 m,and is comprised by eight lithofacies,including laminated and nonlaminated mudstone/shale,dolomitic siltstone,laminated lime mudstone/shale,argillaceous siltstone,laminated and nonlaminated silty mudstone/shale,fine grained silty sandstone,calcareous concretions and organic matter enriched noncalaceous shale.The depositional environment gradually changes from cutoff basin,deep shelf,and to shallow shelf bottom-up.Porosity measured on core samples of the shale from the Longmaxi Formation in exploratory wells ranges from 0.58% to 0.67%.The microporosity observed in the thin sections of the shale is dominated by the intercrystal and intragranular pores.TOC of Longmaxi Formation ranges from 0.55% to 4.41% in SE Sichuan Basin,but only the lower part is high quality source rocks,the mid-upper with general source rocks.TOC is very high in Shizhu profile,east Chongqing-west Hubei Province,with range of 0.55%～5.88%,but which is lower than 0.3% in other regions.Organic matter range from type Ⅰ-kerogen to type Ⅱ1-2-kerogen in Longmaxi Formation,but is dominated by the latter.The maturity of organic matter in Longmaxi Formation is very high,with late stage of post-maturation,and Ro is just lower than 2.0% in high point of local structure or upper part of Longmaxi Formation.The lower part of Longmaxi Formation(mainly aquatic algae)is deposited in restricted deoxidation conditions,which is revealed by chromatography-mass spectrometry features of saturated hydrocarbon,But becoming more and oxidation up.The heterogeneity of Longmaxi Formation shale is very strong,and siltstone bedded in lower part shale is more denser in Jianshen #1 well.Shale reservoir in Jianshen #1 well is more developed in Dingshan #1 well. |
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| Keywords: | Longmaxi Formation Shale gas Southeastern Sichuan Eastern Chongqing-western Hubei Geochemistry |
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