柴北缘大煤沟组七段(J2d7)页岩油资源潜力评价——以大煤沟地区为例

汤艳; 张云鹏; 李永红

柴北缘大煤沟组七段(J₂d⁷)页岩油资源潜力评价——以大煤沟地区为例

汤艳^1,3,
张云鹏^2,3,,
李永红⁴

1. 长安大学地球科学与资源学院, 陕西西安 710054;
2. 中国地质调查局西安地质调查中心, 陕西西安 710054;
3. 国土资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054;
4. 青海煤炭地质一〇五勘探队, 青海西宁 810007

基金项目:

国家自然科学基金项目(41302047、41502200)、长安大学中央高校基本科研业务费专项资金(310827161009)资助.

详细信息

作者简介:
汤艳,女,1983年生,讲师,主要从事岩石学、矿物学方面的研究;E-mail:tangyan2011@chd.edu.cn.

通讯作者:
张云鹏,男,1981年生,工程师,主要从事含油气盆地沉积和构造方面的研究

中图分类号: TE15;P53
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出版历程
- 收稿日期: 2015-04-05
- 修回日期: 2015-06-07
- 网络出版日期: 2023-09-26
- 刊出日期: 2016-04-24

The potential evaluation of shale oil in the seventh member of Dameigou Formation(J₂d⁷)on the northern margin of Qaidam Basin: A case study of Dameigou area

1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China;
2. Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, Shaanxi, China;
3. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an 710054, Shaanxi, China;
4. No. 105 Exploration Party, Qinghai Coal Geology Bureau, Xining 810007, Qinghai, China

Funds:

Supported by National Natural Science Foundation of China (No. 41302047、41502200), Central University Special Funding for Basic Scientific Research Business Expenses of Chang'an University (No. 310827161009).

摘要

摘要: 通过对大煤沟地区4口钻井和侏罗系标准剖面的40件大煤沟组七段泥页岩样品进行有机地球化学特征、岩矿特征、储集性能等实验分析。结果表明:样品的总有机碳含量平均值为5.22%;干酪根类型为I-II型,以腐泥质为主;样品有机质成熟度平均值为0.52%,主要为未成熟-低成熟样品;样品的储集空间类型多样、微裂缝发育,有利于页岩油的吸附、存储,矿物组成中大于40%的脆性矿物含量有利于后期的生产压裂。另外,在荧光下,样品断面及层理面具有好的荧光显示,为页岩油的存在提供了直接证据。综合分析认为,大煤沟地区大煤沟组七段具备页岩油形成的地质条件,是中侏罗统页岩油发育的最有利层段。并且在柴北缘范围内,该层段泥页岩单层厚度大,平面上横向分布稳定,结合已有研究成果,初步预测冷湖地区、赛什腾凹陷、鱼卡凹陷、大柴旦-大煤沟地区为柴北缘该层段的页岩油发育有利区。
- 页岩油 /
- 发育条件 /
- 大煤沟组七段 /
- 大煤沟地区 /
- 柴北缘
Abstract: This study used 40 shale samples from the seventh member of Dameigou Formation in 4 drilling wells and the Jurassic standard profile in the Dameigou area to illustrate the organic geochemical characteristics, the petrographic and mineralogical features, and the reservoir properties. According to the results obtained, the average content of total organic carbon is 5.22%; the kerogen is of I-II type, dominated by sapropel; the average value of organic maturity is 0.52%, belonging mainly to immaturity to low maturity; the reservoir space has various types, and micro-fractures are developed in favor of the adsorption and storage of the shale oil, and the content of brittle minerals in the mineral composition is more than 40% in favor of the production fracturing in the future. In addition, the fracture surface and the bedding planes with fluorescent provide the direct evidence for the presence of shale oil. A comprehensive analysis shows that the seventh member of the Dameigou Formation in Dameigou area with the geological conditions of the shale oil formation is the most favorable section for the development of Middle Jurassic shale oil. Moreover, the single layer of the shale in this member has larger thickness and the lateral distribution of this member is stable in the plane within the northern margin of Qaidam Basin. Combined with the existing results, it is tentatively held that the favorable areas for the shale oil development are Lenghu area, Saishiteng depression, Yuka depression and Dachaidan-Dameigou area.
- shale oil /
- developmental condition /
- the seventh member of Dameigou Formation /
- Dameigou area /
- northern margin of Qaidam Basin

HTML全文

图研究区位置及采样点示意图

图1

Figure Map showing location of the study area and sampling site

Fig.1

下载: 全尺寸图片幻灯片

图柴北缘大煤沟组七段泥页岩S₁、(S₁+S₂)与TOC相关关系

图2

Figure The correlation between S₁, (S₁+S₂) with TOC of shale from the 7^th member of Dameigou Formation on the northern margin of Qaidam Basin

Fig.2

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图研究区泥页岩样品干酪根类型特征

图3

Figure The kerogen type of shale in the study area

Fig.3

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图研究区泥页岩样品成熟度分布特征

图4

Figure The distribution characteristics of shale maturity in the study area

Fig.4

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图研究区泥页岩样品矿物组成特征

图5

Figure The mineral composition characteristics of shale in the study area

Fig.5

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图研究区泥页岩样品黏土矿物组成特征

图6

Figure The clay mineral composition characteristics of shale in the study area

Fig.6

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图 a—粒间溶蚀孔，扫描电镜；b—页岩层间孔，扫描电镜；c—微裂缝，扫描电镜； d—黏土矿物晶间孔，扫描电镜

图7

Figure a-Intergranular dissolved pore (SEM); b-The pore between the shale layers (SEM);

Fig.7

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图研究区泥页岩孔隙度、渗透率相关关系

图8

Figure The relationship between porosity and permeability of shale in the study area

Fig.8

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图 a—泥页岩断面荧光特征，W₁井，870.5 m；b—泥页岩层面荧光特征，W₃井，225.3 m

图9

Figure a-The fluorescence characteristics in the fracture surface of shale from W₁ Well at 870.5 m; b-The fluorescence characteristics in the shale layers from W₃ Well at 225.3 m

Fig.9

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图柴北缘大煤沟组七段页岩油有利发育区预测

图10

Figure The favorable areas of shale oil from the 7^th member of Dameigou Formation on the northern margin of Qaidam Basin

Fig.10

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柴北缘大煤沟组七段泥页岩样品热解结果

The pyrolysis results of shales from the 7th member of Dameigou

下载: 导出CSV

页岩油有利区主要评价参数对比

The comparison of main evaluation parameters in favorable area of shale oil

下载: 导出CSV

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