THE GEOCHEMICAL AND MINERALOGICAL CHARACTERISTICS OF SHALES IN CHAIWOBU DEPRESSION, SOUTHERN MARGIN OF JUNGGAR BASIN

XIONG Jinhong; LIANG Mingliang; CAO Zhanyuan; WANG Zongxiu; ZHENG Jianjing; WANG Zuodong

2017 Vol. 23, No. 4

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XIONG Jinhong, LIANG Mingliang, CAO Zhanyuan, WANG Zongxiu, ZHENG Jianjing, WANG Zuodong. THE GEOCHEMICAL AND MINERALOGICAL CHARACTERISTICS OF SHALES IN CHAIWOBU DEPRESSION, SOUTHERN MARGIN OF JUNGGAR BASIN[J]. Journal of Geomechanics, 2017, 23(4): 585-593.

Citation:

THE GEOCHEMICAL AND MINERALOGICAL CHARACTERISTICS OF SHALES IN CHAIWOBU DEPRESSION, SOUTHERN MARGIN OF JUNGGAR BASIN

1.
Institute of Geomechaniscs, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
3.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences/Key Laboratory of Petroleum Resources Research, Lanzhou 730000, Gansu, China

Received Date: 10 February 2017

Publish Date: 25 August 2017

Abstract

Abstract

Using XRD, Rock-eval and GC-MS, kerogen type, organic geochemical characteristics and inorganic mineralogy features of shales in upper Carboniferous, upper Permian, and lower Jurassi from the Chaiwobu depression at southern margin of Junggar Basin were analyzed. The organic geochemical index shows that from Carboniferous to Permian, it has been a long period of fresh-brackish water sedimentary environment in Chaiwobu depression. The sources of organic matter shared the similar source input characteristics, and kerogen type were mainly featured by type Ⅱ. The thermal evolution of organic matter indicates that shales in lower Jurassic were in low mature stage while shales in upper Carboniferous and upper Permian showed the features of high abundance, rich in types and mature-high mature stage in the thermal evolution. The mineralogical characteristics show that the content of brittle minerals feldspar and quartz in upper Permian shales is 73%, followed by clay mineral, indicating a high brittleness index and good property of fracturing and adsorption. Combined with the previous studies, it is predicted that a certain scale of shale gas resources may be contained in shales of this member with a good prospect and potential for exploration.
- Chaiwobu Depression /
- shale /
- biomarker /
- mineralogy /
- shale gas

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References

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