焉耆盆地博湖坳陷侏罗系烃源岩地化特征及生烃潜力

doi:10.11743/ogg20120309

Abstract

Abstract:

This paper evaluated the coal measure source rocks of the Middle and Lower Jurassic Xishanyao Formation,Sangonghe Formation and Badaowan Formationin of Bohu depression in Yanqi Basin by using many organic geochemical methods.The results showed that the source rocks are higher in abundance of organic matter.The Lower Jurassic Badaowan Formation is good source rock,while the Xishanyao and Sangonghe formations are moderate source rock.The types of organic matter are dominated by kerogen Ⅲ with few kerogen Ⅱ₂. Most of the organic matters are within oil window.The organic matters in the Xishanyao Formation are low mature;that in the Sangonghe Formation are partly mature,and that in the Badaowan Formation are mature and in peak oil-generation stage.By comparison of the hydrocarbon generation capacity of the three subsags and the three Formations,the Badaowan Formation is identified as the main source rocks in Yanqi basin.In addition,similar with the source rocks in the Badaowan Formation,the source rocks in the Sangonghe Formation of Qilipu subsag also have high TOC,good organic matter type,suitable thermal maturity,thus have great potential for hydrocarbon generation.According to exploration experiences in recent years,the area along both sides of the structural highs and slope zones of Qilipu subsag is favorable exploration play.

Key words: geochemical characteristics, hydrocarbon generating potential, coal measure source rock, Jurassic, Bohu depression, Yanqi Basin

CLC Number:

TE122.1

Shi Zhengyong, Yan Yongxin, Jin Yunyun, Zhang Hui. Geochemical characteristics and hydrocarbon generation potential for the Jurassic source rocks of Bohu depression in Yanqi Basin[J]. Oil & Gas Geology, 2012, 33(3): 399-406.

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Geochemical characteristics and hydrocarbon generation potential for the Jurassic source rocks of Bohu depression in Yanqi Basin

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