四川盆地五峰组—龙马溪组不同水动力成因页岩岩相特征

doi:10.7623/syxb201404002

石油学报 ›› 2014, Vol. 35 ›› Issue (4): 623-632.DOI: 10.7623/syxb201404002

四川盆地五峰组—龙马溪组不同水动力成因页岩岩相特征

王志峰¹, 张元福¹, 梁雪莉², 程飞², 金其虎², 刘伟², 张海波¹, 李海鹏¹

1. 中国地质大学能源学院北京 100083;
2. 中国石油集团东方地球物理勘探有限责任公司河北涿州 072751

收稿日期:2014-01-18 修回日期:2014-05-16 出版日期:2014-07-25 发布日期:2014-08-05
通讯作者: 王志峰，男，1989年8月生，2012年获山东科技大学学士学位，现为中国地质大学（北京）能源学院矿产普查与勘探专业硕士研究生，主要从事沉积学相关领域的研究。Email：wangzhifeng0503@163.com
作者简介:王志峰，男，1989年8月生，2012年获山东科技大学学士学位，现为中国地质大学（北京）能源学院矿产普查与勘探专业硕士研究生，主要从事沉积学相关领域的研究。Email：wangzhifeng0503@163.com
基金资助:
国家重大科技专项（2011ZX05009-002）和国家自然科学基金重点项目（No.41102089）资助。

Characteristics of shale lithofacies formed under different hydrodynamic conditions in the Wufeng-Longmaxi Formation, Sichuan Basin

Wang Zhifeng¹, Zhang Yuanfu¹, Liang Xueli², Cheng Fei², Jin Qihu², Liu Wei², Zhang Haibo¹, Li Haipeng¹

1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
2. CNPC Geophysical Company Limited, Hebei Zhuozhou 072751, China

Received:2014-01-18 Revised:2014-05-16 Online:2014-07-25 Published:2014-08-05

摘要/Abstract

摘要：

以四川盆地南缘奥陶纪末至志留纪初沉积的五峰组—龙马溪组页岩为研究对象，通过岩心观察、薄片鉴定和测井资料分析等方法，从页岩沉积的水动力成因角度考虑，划分出强、弱两类水动力带，共8种岩相。弱水动力带下发育硅质页岩、含钙硅质页岩和泥晶钙质页岩；强水动力带下发育钙质纹层页岩、介壳泥灰岩和波状层理页岩；白云质页岩和磷质页岩在两种水动力带下均发育。不同的岩相具有不同的岩石组分、颗粒大小、结构及构造、生物遗迹和化石组合。页岩岩相与有机碳含量有良好的对应关系：弱水动力带下岩相有机碳含量要高于强水动力带下岩相。磷质页岩和硅质页岩有机碳含量高，介于4% ~7%；白云质页岩、波状层理页岩和泥晶钙质页岩有机碳含量低，介于0.5% ~2.5%。同时，各种页岩岩相在测井上有较好的识别标志，磷质页岩表现为高自然伽马，其自然伽马值接近300 API或者更高。介壳泥灰岩和白云质页岩表现为低自然伽马，其自然伽马值为60~70 API。钙质纹层页岩自然伽马曲线多呈锯齿状，其自然伽马值为80~100 API。研究成果完整呈现了不同水动力成因的页岩岩相特征，具备一定的代表性。

关键词: 四川盆地, 五峰组, 龙马溪组, 水动力成因, 页岩岩相, 测井识别

Abstract:

The hydrodynamic origins of the shales in the Wufeng-Longmaxi Formation, Sichuan Basin were studied and divided into 2 types, namely the strong hydrodynamic regime and weak hydrodynamic regime, and a total of eight kinds of lithofacies were recognized based on well cores, thin section and logging data. Siliceous shale, calcareous siliceous shale and micritic/limy shale were deposited in the weak hydrodynamic regime; calcareous laminae shale, shelly muddy limestone and wavy bedding shale were deposited in the strong hydrodynamic regime while dolomitic shale and phosphatic shale occurred in both regimes. Different shale lithofacies have different mineralogy, grain size, texture, sedimentary structures, ichnofabrics and fossil assemblages. Total organic carbon(TOC) content has a good corresponding relation with shale lithofacies:Total organic carbon content of the lithofacies formed in the weak hydrodynamic regime is higher than those formed in the strong hydrodynamic regime. Phosphatic shale and siliceous shale have the highest TOC ranging from 4% to 7%; dolomitic shale, wavy bedding shale and micritic/limy shale are poor in TOC, ranging from 0.5% to 2.5%. Meanwhile, All the shale lithofacies have good identification marks on the log, The interval rich in phosphatic shale exhibits a spike in gamma ray response with values close to, or over 300 API; those intervals rich in dolomitic shale and shelly muddy limestone exhibit a low gamma ray response with values ranging around 60~70 API. Calcareous laminae shale exhibits serrated gamma ray response with values around 80~100 API.

Key words: Sichuan Basin, Wufeng-Longmaxi Formation, hydrodynamic factors, shale lithofacies, logging identification

中图分类号:

TE112.221

王志峰, 张元福, 梁雪莉, 程飞, 金其虎, 刘伟, 张海波, 李海鹏. 四川盆地五峰组—龙马溪组不同水动力成因页岩岩相特征[J]. 石油学报, 2014, 35(4): 623-632.

Wang Zhifeng, Zhang Yuanfu, Liang Xueli, Cheng Fei, Jin Qihu, Liu Wei, Zhang Haibo, Li Haipeng. Characteristics of shale lithofacies formed under different hydrodynamic conditions in the Wufeng-Longmaxi Formation, Sichuan Basin[J]. ACTA PETROLEI SINICA, 2014, 35(4): 623-632.

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四川盆地五峰组—龙马溪组不同水动力成因页岩岩相特征

Characteristics of shale lithofacies formed under different hydrodynamic conditions in the Wufeng-Longmaxi Formation, Sichuan Basin

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