四川盆地及周缘上奥陶统五峰组岩相特征

杜伟; 胡宗全; 刘光祥; 朱彤; 聂海宽; 颜彩娜; 王冠平

doi:10.11781/sysydz202003398

四川盆地及周缘上奥陶统五峰组岩相特征

doi: 10.11781/sysydz202003398

1.
中国石化石油勘探开发研究院, 北京 100083
2.
中国地质大学(北京)能源学院, 北京 100083

基金项目:

国家重大专项“海相页岩有机质富集机理研究” 2017ZX05036002-001

详细信息

作者简介:
杜伟(1984-), 男, 博士, 高级工程师, 从事页岩气地质研究。E-mail: duwei.syky@sinopec.com

中图分类号: TE132.2
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出版历程
- 收稿日期: 2020-02-23
- 修回日期: 2020-04-20
- 刊出日期: 2020-05-28

Lithofacies of Upper Ordovician Wufeng Formation in Sichuan Basin and its periphery

1.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China
2.
School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China

摘要

摘要: 上奥陶统五峰组分为页岩段和观音桥段。对比分析四川盆地及周缘五峰组页岩气钻井岩心以及测试数据，根据岩心和全岩矿物组分特征，以硅质矿物（石英）、黏土矿物和碳酸盐矿物为三端元，进行岩相划分。页岩段可识别出4种岩相类型：硅质页岩、含黏土硅质页岩、含灰硅质页岩以及含灰黏土质页岩；观音桥段发育含介壳泥质灰岩。页岩气钻井实测数据表明，页岩段4类页岩岩相品质（有机碳含量、脆性矿物含量以及含气量）差异较大，硅质页岩品质最优，含灰黏土质页岩品质最差。页岩段岩相类型以及观音桥段分布特征受控于沉积环境。川南永川地区等相对浅水的区域页岩厚度较大，但是硅质页岩厚度较小，页岩段整体品质较差，不建议作为水平井靶窗；川南威远地区受古陆和古地形影响，硅质页岩厚度较小，也不建议作为水平井靶窗；川东南焦石坝、武隆、丁山以及南川地区硅质页岩厚度超过4 m，可作为水平井靶窗。
- 页岩气 /
- 水平井靶窗 /
- 硅质页岩 /
- 观音桥段 /
- 五峰组 /
- 四川盆地
Abstract: The Upper Ordovician Wufeng Formation was divided into the shale and Guanyinqiao sections. Based on the comparative analysis of shale gas drilling cores and the whole rock mineral composition of the Wufeng Formation in the Sichuan Basin and its periphery, three end members including siliceous minerals (quartz), clay minerals and carbonate minerals were chosen for lithofacies classification. Four lithofacies types were identified in the shale section including siliceous shale, clayey siliceous shale, gray siliceous shale and gray clayey shale, while in the Guanyinqiao section, shell marl developed. The shale gas drilling showed that the four lithofacies types vary in TOC, brittle mineral and gas contents. The quality of siliceous shale is the best, and the quality of gray clayey shale is the worst. The lithofacies types of the shale section and the distribution characteristics of the Guanyinqiao section were controlled by the sedimentary environment. The shale thickness in Yongchuan area and other relatively shallow water areas in the southern Sichuan Basin is relatively large, but the thickness of siliceous shale is small, and the overall quality of the shale section is poor, so it is not recommended as the target window of horizontal wells. The thickness of siliceous shale in Weiyuan area in the southern Sichuan is small due to the influence of ancient land and topography, and it also is not recommended as the target window of horizontal wells. The thickness of siliceous shale in Jiaoshiba, Wulong, Dingshan and Nanchuan areas in the southeastern Sichuan Basin is more than 4 m, which can be regarded as a target window of horizontal wells.
- shale gas /
- target window of horizontal well /
- siliceous shale /
- Ganyinqiao section /
- Wufeng Formation /
- Sichuan Basin

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图 1 四川盆地及周缘区域构造及井位

Figure 1. Regional structure and well location of Sichuan Basin and its periphery

下载: 全尺寸图片幻灯片

图 2 四川盆地五峰组硅质页岩特征

a.焦页1井，2 412 m；b.威页23-1井，3 587.7 m；c.永页1井，3 865.9 m，正交光；d.三角图数据；e, f.威页23-1井，3 847.5 m，阴极发光照射特征

Figure 2. Characteristics of siliceous shale in Wufeng Formation, Sichuan Basin

下载: 全尺寸图片幻灯片

图 3 四川盆地五峰组含黏土质硅质页岩特征

a.岩心特征，永页1井，3 869.41 m；b.三角图数据；c，d.阴极发光照射特征

Figure 3. Characteristics of clayey siliceous shale in Wufeng Formation, Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地五峰组含灰硅质页岩特征

a.岩心特征，威页23-1井，3 849.63 m；b.三角图数据；c.正交光镜下特征；d.单偏光镜下特征；e，f.阴极发光照射特征

Figure 4. Characteristics of gray siliceous shale in Wufeng Formation, Sichuan Basin

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图 5 四川盆地五峰组含灰黏土质页岩特征

a.岩心特征，永页1井，3 849.63 m；b.岩心断面角石；c.三角图数据

Figure 5. Characteristics of gray clayey shale in Wufeng Formation, Sichuan Basin

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图 6 四川盆地五峰组观音桥段含介壳泥质灰岩特征

a，b.岩心特征，仁页1井，4 050.5 m；c，d，薄片特征，威页23-1井，3 849.04 m；e，f.岩心特征，焦石坝地区

Figure 6. Characteristics of marl with shell in Guanyinqiao Section, Wufeng Formation, Sichuan Basin

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图 7 四川盆地焦页1井五峰组

及其上、下地层岩性组合特征a.瘤状灰岩；b.含灰黏土质页岩；c.硅质页岩；d.含介壳泥质灰岩；e.硅质页岩

Figure 7. Lithologic combination of Wufeng and neighbouring formations in well Jiaoye 1, Sichuan Basin

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图 8 四川盆地五峰组地层对比剖面

Figure 8. Stratigraphic correlation of Wufeng Formation, Sichuan Basin

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图 9 四川盆地及周缘五峰组硅质页岩厚度等值线

Figure 9. Thickness contours of siliceous shale in Wufeng Formation, Sichuan Basin and its periphery

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图 10 四川盆地及周缘观音桥段厚度等值线

Figure 10. Thickness contours of Guanyinqiao section, Sichuan Basin and its periphery

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表 1 四川盆地及周缘五峰组页岩岩相参数统计

Table 1. Lithofacies parameters of Wufeng shale in Sichuan Basin and its periphery

岩相类型	样品个数	石英含量/%	有机碳含量/%	脆性矿物含量/%	含气量/(m³·t^-1)
硅质页岩	12	67.6	4.6	72.1	5.2
含灰硅质页岩	4	42.0	3.5	68.3	3.6
含黏土硅质页岩	3	45.9	3.6	65.4	3.6
含灰黏土质页岩	4	33.4	1.2	52.1	1.1
注：数据来自焦页1、永页1、威页23-1、丁页2、彭页1井等。

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