Evaluation of Hydrocarbon Source Rocks in Xiaoliangshan Sag, Western Qaidam Basin

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  • 1. Environemnt and Resources School, Lanzhou University, Lanzhou 730000, China;2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company,Dunhuang 736202, China; 3. Key Laboratory of Gas Geochemistry, Institute of Geology and  Geophysics, Chinese Academy of Sciences, Lanzhou  730000, China

Received date: 2009-02-12

  Revised date: 2009-04-27

  Online published: 2009-06-10

Abstract

The Tertiary System of Western Qaidam Basin has become the major yield area in recent years, where the hydrocarbon\|bearing stratigraphy is discovered in the Nanyi Mountain area with the higher production. According to the oil\|source correlation, the source derives from the Xiaoliang Mountain Sag in the Nanyi Mountain oilfield. The study on hydrocarbon source rocks indicates that the hydrocarbon source rocks of Xiaoliang Mountain Sag is mainly dark lime mudstone and mud limestone with a little of carbonates; the source rocks are primarily distributed in Lower Ganchiagou Formation (E23), Upper Ganchaigou Formation(N1), Lower Youshashan Formaiton(N12) and Upper Youshashan Formation(N22) characterized by low quantity of organic carbon, high quantity of chloroform bitumen A, and total hydrocarbon at the average of 100×10-6above (peak value is more than 1 000×10-6); the organic matter is domiantly type Ⅱ ranging from the immature to mature stages. The hydrocarbon source rocks in Upper Ganchaigou Formation (N1) and Lower Youshashan Formation (N12) have high abundance of organic matter and have the great potential to generate hydrocarbons.

Cite this article

JIANG Xiao-Jing, LV Zong-Lun, SUN Bai-Nian, LIU Chun-Yan, FANG Lin-Gao . Evaluation of Hydrocarbon Source Rocks in Xiaoliangshan Sag, Western Qaidam Basin[J]. Natural Gas Geoscience, 2009 , 20(3) : 405 -410 . DOI: 10.11764/j.issn.1672-1926.2009.03.405

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