准南芦草沟组页岩有机地球化学特征及非常规油气地质意义

doi:10.3969/j.issn.1672-7703.2017.04.003

摘要/Abstract

摘要： 在四川盆地页岩气勘探开发取得巨大成功之后，为了评价准噶尔盆地南缘页岩气资源潜力，结合地表地质调查及页岩气调查井钻探成果，对准噶尔盆地南缘芦草沟组泥页岩有机地球化学特征进行了博格达东段与西段及芦草沟组内部上段与中段、下段和露头与钻井的详细对比研究，并指出了芦草沟组的非常规油气潜力。研究结果表明：①芦草沟组有机质类型以岩石热解进行划分的结果比镜检结果更趋合理，且干酪根主要为Ⅰ型及Ⅱ₁型，Ⅱ₂型及Ⅲ型所占比重相对较小，Ⅲ型干酪根在博格达东段比西段发育。②芦草沟组有机质丰度高，77%的样品其TOC ≥ 2%，TOC主要介于3.0%~4.0%之间；平面上，博格达西段芦草沟组TOC高于博格达东段；纵向上，中段TOC高于上段，而上段高于下段。③芦草沟组有机质镜质组反射率峰值为0.8%， T_max主要介于440~450℃之间，有机质处于成熟阶段为主；芦草沟组在博格达东段抬升暴露略早于博格达西段，所经历的热演化程度略低于博格达西段。④准南芦草沟组具较好的致密油与页岩气勘探潜力，而且博格达西段芦草沟组页岩气勘探潜力可能好于博格达东段。

关键词: 准噶尔, 芦草沟组, 页岩气, 干酪根类型, 有机碳含量, 有机质成熟度

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

中图分类号:

TE112.113

白洪海, 王正和, 周继兵, 吴超. 准南芦草沟组页岩有机地球化学特征及非常规油气地质意义[J]. 中国石油勘探, 2017, 22(4): 26-35.

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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