WANG Shuang qing, Jürgen Rullktter, WANG Pei rong. Isoprenoid and Straight-chmn Alcohols in the Green River Formation,Wyoming[J]. Acta Sedimentologica Sinica, 2001, 19(3): 474-480.
| Citation:
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WANG Shuang qing, Jürgen Rullktter, WANG Pei rong. Isoprenoid and Straight-chmn Alcohols in the Green River Formation,Wyoming[J]. Acta Sedimentologica Sinica, 2001, 19(3): 474-480.
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Isoprenoid and Straight-chmn Alcohols in the Green River Formation,Wyoming
- 1.
Petroleum University of China, Beijing, China 102249;
- 2.
C.V.O. University of Oldenburg, ICBM, Postfach 2503, D 26111 Oldenburg, Germany;
- 3.
Jianghan Petroleum Institute, Jingzhou,Hubei,Ching 434102
- Received Date: 1999-11-01
- Rev Recd Date:
2000-11-26
- Publish Date:
2001-09-10
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Abstract
In this paper ocurrence and distribution patterns are presented of isoprenoid and straight chain alcohols in twenty three exposed rocks from the Eocene Green River Formation at the Trail Dugway and the Hiawatha Creek sections. The Trail Dugway section of the Laney Shale Member was deposited in the center of a shallow, hydrologically closed, alkaline to highly saline lake under semi humid to semi arid climatic conditions. This sediment contains alginite rich organic matter in high concentrations. The Hiawatha Creek section of the Luman Tongue Member, representing the lake center, shoreline and lake plain facies, was accumulated in a hydrologically open freshwater lake under humid climatic conditions. Both sections are located in the Washikie Basin, Wyoming, USA. Abundant isoprenoid alcohols with carbon number from 11 to 20 were dectected to be of diversity of isomers in all samples. Straight chain alcohols range from 10 to 33 with the hydroxyl group at every theoretically possible positions. The concenration of primary alcohols is low. The results show that the organic matter of the Green River Formation suffered two times from biodegradation, during the sedimentation and after the uplift, respectively. While primary alcohols show a dominant biogenic origin, the mid chain alcohols evidence the second biodegradation of alkanes after the sediments were uplifted to the present position. The notably high Oxygen Indices of the Green River Oil Shale is attributed to the second biodegradation. The distribution patterns of mid chain alcohols are related to the input of organic materials, sedimentary environments, and the degree of the first biodegradation. The mid chain alcohols of Laney Shale sediments are dominated by short chain components, which is consistent with the semi arid climate with insignificant terrestrial run off. On the other hand, a significant proportion of long chain constituents in the Luman Tongue section indicates that abundant higher plant material was swept into the lake during times of more humid climatic conditions. Data reveal that the saline sedimentary environment of Laney Shale is more favourable for preservation of organic matter from biodegradation than that of the freshwater Luman Tongue.
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References
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