Organic geochemistry of Lucaogou Formation shale in southern Junggar Basin and its geological significance for unconventional hydrocarbon potential

doi:10.3969/j.issn.1672-7703.2017.04.003

Abstract

Abstract: Considering the great success in the shale gas exploration and development in the Sichuan Basin, the shale gas potential in the southern Junggar Basin is worthy of study. Accordingly, based on the surface geologic investigation and the drilling results of shale gas detection wells, analysis and comparison were carried out for the organic geochemistry characteristics of the Lucaogou Formation shale in the eastern and western parts of the Bogda Mountain, the upper, middle and lower members of the Lucaogou Formation, and outcrop and drilling samples. Moreover, the unconventional hydrocarbon potential in the Lucaogou Formation was predicted. Some conclusions are drawn as follows. First, in the Lucaogou Formation, the kerogen types discriminated with rock pyrolysis are more reasonable than those discriminated with microscopic examination, indicating primary type I and type Ⅱ₁ kerogen, a little type Ⅱ₂ and type Ⅲ, and more type Ⅲ in the eastern part than the western part of the Bogda Mountain. Second, the Lucaogou Formation has high organic matter abundance. Particularly, 77% of the samples show TOC ≥ 2%, mostly between 3.0% and 4.0%. Horizontally, the TOC is higher in the western part than that in the eastern part of the Bogda Mountain; vertically, it is higher in the middle member than that in the upper member, but higher in the upper member than that in the lower member of the Lucaogou Formation. Third, the peak Ro is mainly around 0.8%, the T_max ranges from 440℃ to 450℃, and the organic matter is mainly in mature stage. The Lucaogou Formation was uplifted and exposed earlier in the eastern part than the western part of the Bogda Mountain, and accordingly the thermal evolution in the eastern part is slightly lower than that in the western part. Fourth, the Lucaogou Formation is highly potential for tight oil and shale gas exploration, and the shale gas potential in the western part is better than that in the eastern part of the Bogda Mountain.

Key words: Junggar Basin, Lucaogou Formation, shale gas, kerogen type, TOC, organic maturity

CLC Number:

TE112.113

Bai Honghai, Wang Zhenghe, Zhou Jibin, Wu Chao. Organic geochemistry of Lucaogou Formation shale in southern Junggar Basin and its geological significance for unconventional hydrocarbon potential[J]. China Petroleum Exploration, 2017, 22(4): 26-35.

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