塔里木盆地北部地区上奥陶统烃源条件

doi:10.11743/ogg20120605

Abstract

Abstract:

Many wells have encountered the Qrebake,Lianglitaga and Sangtamu formations in Upper Ordovician of northern Tarim Basin.A systematic analysis of source rock samples from the sequence indicates that it was characterized by low abundance of organic matters and mixed organic types.In southern Tahe area,the Upper Ordovician source rock is poorly developed with a vitrinite reflectance (R_o) of about 1%,thus could not be the source of commercial oil and gas reservoirs.In contrast,in northern Tarim Basin,the Upper Ordovician carbo-nates are both source rocks and reservoirs,making conventional oil-source correlation impossible.The study adopted two oil-source correlation methods to compare the properties of direct extracts from source rocks and their pyrolysis yields with that of crude oil from the reservoirs.The result shows that there is no source-product relationship between the crude from Tahe oilfield and source rocks from the Upper Ordovician.The geochemical characteristics of direct extracts from the Upper Ordovician source rocks are something between that of crude oil and pyrolysis yield,while the geochemical characteristics of crude oil and the pyrolysis yield are quite different.The new method of oil-source correlation solved the problem of the conventional oil-source correlation method not applicable to the Upper Ordovician as it is both source rocks and reservoirs at the same time.

Key words: oil-source correlation, source rock, Upper Ordovician, organic geochemistry, Tahe oilfield

CLC Number:

TE121.1

Huang Jiwen, Gu Yi, Ding Yong, Jia Cunshan. Upper Ordovician source rocks in northern Tarim Basin[J]. Oil & Gas Geology, 2012, 33(6): 853-858,866.

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Upper Ordovician source rocks in northern Tarim Basin

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