川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2016.03.032

古地理学报 ›› 2016, Vol. 18 ›› Issue (3): 457-472. doi: 10.7605/gdlxb.2016.03.032

川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系^*

牟传龙^{1, 2}, 王秀平^{1, 2}, 王启宇^{1, 2}, 周恳恳^{1, 2}, 梁薇^{1, 2}, 葛祥英^{1, 2}, 陈小炜^{1, 2}

1 中国地质调查局成都地质调查中心,四川成都 610081;
2 国土资源部沉积盆地与油气资源重点实验室,四川成都 610081

收稿日期:2016-01-08 修回日期:2016-03-07 出版日期:2016-06-01 发布日期:2016-06-01
作者简介:牟传龙,男,1965年生,1993年毕业于成都地质学院(现成都理工大学)。现为成都地质调查中心研究员、博士生导师;主要研究方向为沉积地质学及油气地质学。
基金资助:
*中国地质调查局地质调查项目(编号:12120115004301)与国家自然科学基金项目(编号:41302093)共同资助

Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas

Mou Chuanlong^{1, 2}, Wang Xiuping^{1, 2}, Wang Qiyu^{1, 2}, Zhou Kenken^{1, 2}, Liang Wei^{1, 2}, Ge Xiangying^{1, 2}, Chen Xiaowei^{1, 2}

1 Chengdu Center,China Geological Survey,Chengdu 610081,Sichuan;
2 Key Laboratory of Sedimentary Basin and Oil and Gas Resources,Ministry of Land and Resources,Chengdu 610081,Sichuan

Received:2016-01-08 Revised:2016-03-07 Online:2016-06-01 Published:2016-06-01
Contact: Bao Zhidong,born in 1964,is a professor of China University of Petroleum(Beijing). He is mainly engaged in sedimentary geology,lithofacies palaeogeography and reservoir geology and description. E-mail: baozhd@cup.edu.cn. E-mail:cdmchuanlong@163.com。
Supported by:
Co-funded by the Geological Survey Project of China Geological Survey(No.12120115004301)and the National Natural Science Foundation of China(No.41302093)

摘要/Abstract

摘要： 在川南及邻区下志留统龙马溪组下段沉积相详细研究的基础上,结合偏光显微镜、X衍射及元素地球化学分析等,提出沉积相对页岩气地质条件的影响特征。研究发现:川南及邻区龙马溪组下段主要发育潮坪相和浅海陆棚相。局限滞留的缺氧还原环境、快速海侵形成的分层水体、适宜的沉积速率及较高的生物产率,造成了龙马溪组下段有机质富集,并以硅质型页岩为主,利于页岩气的富集与开发。隆起边缘的潮坪相沉积,为页岩气的非有利区;沉积中心的深水陆棚沉积区,主要发育碳质硅质页岩、碳质页岩与含粉砂含钙碳质页岩,为页岩气的有利区;砂泥质浅水陆棚含有较高的有机质,应为页岩气发育的次级有利区;灰泥质浅水陆棚主要发育“钙质页岩+含碳泥质灰岩”,有机质含量相对较低,为页岩气的较不利发育区。

关键词: 岩石类型, 沉积相, 页岩气, 龙马溪组, 下志留统, 川南及邻区

Abstract: On the basis of detailed study of sedimentary facies of the Lower Longmaxi Formation of Silurian in southern Sichuan Basin and its adjacent areas,combining with the results of experimental methods such as polarizing microscope,X-ray diffraction and element geochemistry,the relationship between sedimentary facies and shale gas geological conditions were studied. Tidal flat and shallow shelf facies are the two main sedimentary facies in the study area. The lower section of the Longmaxi Formation is rich in organic matters and siliceous shales,which were conducive to the enrichment and development of shale gas. The formation of siliceous shale riched in organic matter of the lower member of Longmaxi Formation was due to the anoxic retention environment,layered water caused by a rapid transgression,appropriate deposition rate and relative high biological yield. The tidal flat deposits are unfavourable for shale gas formation. Deep-water shelf facies in the depocenter are dominated by carbonaceous siliceous shale,carbonaceous shale and calcium carbonaceous silty shale,which are favorable for shale gas formation. Sandy and muddy shallow shelf is the secondary favorable area for shale gas development containing more organic matters;marlite and muddy shallow shelf is composed mainly of “calcareous mudstone and carbonaceous argillaceous limestone”,which are not favorable for shale gas formation with relative low organic matter content.

Key words: rock type, sedimentary facies, shale gas, Longmaxi Formation, Lower Silurian, southern Sichuan Basin and its adjacent area

中图分类号:

P512.2

牟传龙, 王秀平, 王启宇, 周恳恳, 梁薇, 葛祥英, 陈小炜. 川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系^*[J]. 古地理学报, 2016, 18(3): 457-472.

Mou Chuanlong, Wang Xiuping, Wang Qiyu, Zhou Kenken, Liang Wei, Ge Xiangying, Chen Xiaowei. Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas[J]. JOPC, 2016, 18(3): 457-472.

http://www.gdlxb.cn/CN/Y2016/V18/I3/457

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[44] Rimmer S M,Thompson J A,Gooodmight S A. 2004. Multiple controls on the preservation of organic matter in Devonian-Mississippian marian black shales:Geochemical and petrographic evidence. Palaeogeography,Palaeoclimatology,Palaeoecology,215:125-154.
[45] Passey Q R,Bohacs K M,Esch W L,Klimentidis R,Sinha S. 2010. From oil-prone source rock to gas-producing shale reservoir-geologic and petrophy characterization of unconventional shale gas reservoir. International Oil and Gas Conference.
[46] Pedersen T F,Calvert S E. 1990. Anoxia vs. productivity:What conrols the formation of organic carbon rich sediments and sedimentary rocks. AAPG Bulletin,4:454-466.
[47] Wignall P B,Maynard J R. 1993. The sequence sratigraphy of transgressive black shales. In: Katz B J,Pratt L M,eds. Source Rocks in a Sequence stratigraphy Framwork. AAPG Stud.Geol,37:35-47.

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川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系^*

Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas

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川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系*

Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas

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川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系^*