Difference between Middle and Lower Jurassic Source Rocks in Northern Margin of Qaidam Basin and Potential Exploration Significances

FU  Ling, ZHANG  Zi-Ya, ZHANG  Dao-Wei, ZHOU  Shi-Xin

doi:10.11764/j.issn.1672-1926.2010.02.218

2010 , Vol. 21 >Issue 2: 218 - 223

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.02.218

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Difference between Middle and Lower Jurassic Source Rocks in Northern Margin of Qaidam Basin and Potential Exploration Significances

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1. Northwest University, Xi′an 710069, China; 2.Qinghai Oilfield Company, PetroChina,
Dunhuang 736202, China；3. Key Laboratory of Petroleum Resources Research, Institute ofGeology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China

Received date: 2010-01-29

Revised date: 2010-02-24

Online published: 2010-04-10

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Abstract

Distribution of sedimentary facies obviously controls effective source rock in the northern margin of Qaidam basin. Source rocks in the area mainly include four types like as mudstone, coal, carbonaceous mudstone and shale. There are obvious differences between their hydrocarbon generation potential and characteristics of biomarkers. Oil-source correlation indicates that petroleum in Lenghu 3, Nanbaxian and Mabei oilfield would be derived from sapropelite. Oil and gas exploration in the northern Margin of Qaidam basin should not only pay attention to Jurassic coal measure, but also to sapropelic. These high quality sapropelic sources mainly consist in the middle Jurassic mudstone and oil shale, located in the Saishiteng and Yuka sag. Favorable exploration area for these hydrocarbon source rocks should focus on the north of Maxian fault and Lenghu 6 and Lenghu 7 tectonic belts.

Key words： Northern Qaidam basin; Oil-source correlation; High-quality source rock; Favorable exploration target.

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FU Ling, ZHANG Zi-Ya, ZHANG Dao-Wei, ZHOU Shi-Xin . Difference between Middle and Lower Jurassic Source Rocks in Northern Margin of Qaidam Basin and Potential Exploration Significances[J]. Natural Gas Geoscience, 2010 , 21(2) : 218 -223 . DOI: 10.11764/j.issn.1672-1926.2010.02.218

References

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