西藏羌塘盆地中生界海相烃源岩特征

doi:10.11743/ogg20080310

Abstract

Abstract:

Qiangtang Basin has well-developed thick marine deposits with the Jurassic as the thickest(ten thousand meters).Four sets of high quality source rocks,namely the Triassic Xiaochaka Formation,the Jurassic Buqu,Xiali,and Suowa formations,are extensively distributed in the Mesozoic Qiangtang basin.These source rocks are mainly composed of limestone and mudstone with a maximum thickness over 3000 m.The source rocks in the Upper Triassic Xiaochaka Formation and the Middle Jurassic Buqu Formation have larger thickness and their organic matters are mainly of type Ⅱ with maturity varying from mature to over-mature,and average TOC is over 1.5%.They have favorable burial conditions and are the main hydrocarbon source in the basin.The Jurassic Suowa Formation is also rather thick and its organic matters are of mostly type Ⅰ and Ⅱ,however,the formation was over exposed and not favorable for hydrocarbon generation.There were two peaks of hydrocarbon generation:late Jurassic-early Cretaceous and Neogene.

Key words: source rock, type of organic matter, oil and gas distribution, marine, Mesozoic, Qiangtang Basin

CLC Number:

TE122.1

Wu Xinhe, Zhang Li, Wang Chengshan, Yi Haisheng. Characteristics of the Mesozoic marine source rocks in the Qiangtang Basin,Tibet[J]. Oil & Gas Geology, 2008, 29(3): 348-354,347.

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Characteristics of the Mesozoic marine source rocks in the Qiangtang Basin,Tibet

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