雪峰山西侧北缘五峰组-龙马溪组含笔石页岩热成熟度特征

樊云鹏; 刘岩; 文志刚; 王宗秀; 张林炎; 唐鹏海; 徐耀辉; 田永晶; 陈吉; 严刚

doi:10.3799/dqkx.2019.098

Volume 44 Issue 11

Nov. 2019

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Article Navigation > Earth Science > 2019 > 44(11): 3725-3735

Fan Yunpeng, Liu Yan, Wen Zhigang, Wang Zongxiu, Zhang Linyan, Tang Penghai, Xu Yaohui, Tian Yongjing, Chen Ji, Yan Gang, 2019. Characteristics of Thermal Maturity of Graptolite-Bearing Shales in Wufeng-Longmaxi Formations on Northern Margin of Xuefeng Mountain. Earth Science, 44(11): 3725-3735. doi: 10.3799/dqkx.2019.098

Citation:

Fan Yunpeng, Liu Yan, Wen Zhigang, Wang Zongxiu, Zhang Linyan, Tang Penghai, Xu Yaohui, Tian Yongjing, Chen Ji, Yan Gang, 2019. Characteristics of Thermal Maturity of Graptolite-Bearing Shales in Wufeng-Longmaxi Formations on Northern Margin of Xuefeng Mountain. Earth Science, 44(11): 3725-3735. doi: 10.3799/dqkx.2019.098

Citation:

Fan Yunpeng, Liu Yan, Wen Zhigang, Wang Zongxiu, Zhang Linyan, Tang Penghai, Xu Yaohui, Tian Yongjing, Chen Ji, Yan Gang, 2019. Characteristics of Thermal Maturity of Graptolite-Bearing Shales in Wufeng-Longmaxi Formations on Northern Margin of Xuefeng Mountain. Earth Science, 44(11): 3725-3735. doi: 10.3799/dqkx.2019.098

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Characteristics of Thermal Maturity of Graptolite-Bearing Shales in Wufeng-Longmaxi Formations on Northern Margin of Xuefeng Mountain

doi: 10.3799/dqkx.2019.098

1.
College of Resources and Environment, Yangtze University, Wuhan 430100, China
2.
Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou 434023, China
3.
Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao 266590, China
4.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
5.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Received Date: 2019-04-27
Publish Date: 2019-11-15

Abstract

Abstract

The maturity of the Wufeng-Longmaxi Formation organic-rich shales with graptolites, which is now one of the most successful and important shale gas exploration targets in China, has been controversial due to the lack of vitrinite. In this paper, taking this formation shale located on the northern margin of Xuefeng Mountain as an example, the graptolite reflectance is used to represent the maturity characteristics. It is concluded that this shale is rich in graptolite, mainly composed of non-granular graptolites which have biaxial optical characteristics, and its maximum reflectance (GR_max) and bireflectance are positive. In addition, the higher the maturity of the graptolites, the greater the anisotropy of graptolite reflectance. At the same time, this formation is also rich in asphalt particles, and its random reflectance value is also positively correlated with the maximum and random reflectance of the graptolites, and its anisotropy is weaker than the former. However, the reflectance of asphalt particles is difficult to measure because of its complicated formation factor and smaller size. Relatively speaking, the graptolite reflectance is more dominant as a thermal maturity indicator. The Wufeng-Longmaxi Formation shales located on the northern margin of Xuefeng Mountain is a favorable area for shale gas exploration because of its high maturity. The equivalent vitrinite reflectance values (EqVR_o) of this shale has reached more than 3.10%, reaching the over-mature stage.
- shale gas,
- graptolite reflectance,
- Wufeng-Longmaxi Formations,
- thermal evolution,
- petroleum geology

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References(55)

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Characteristics of Thermal Maturity of Graptolite-Bearing Shales in Wufeng-Longmaxi Formations on Northern Margin of Xuefeng Mountain

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