Geochemical Characteristics of the Source Rock of K Formationin the Western Sag of Bongor Basin,Chad
Received date: 2012-05-02
Revised date: 2012-07-31
Online published: 2012-12-10
The exploration degree is low of the west area in the Bongor basin and the cognition of the Petroliferous potential is limited.Based on the organic geochemistry analytical data of the source rock samples of the two exploratory wells in the Western sag and combined with regional geological information,a comprehensive study of the K Formation source rocks has been carried out spanning the aspects of hydrocarbon generation potential,hydrocarbon generation history and characteristics of biomarkers,etc..The result indicates that the dark mudstone and shale are abundant in the western sag.The organic matter abundance is high and the source rock is good.The organic type is mainly typeⅡ1which is favorable for hydrocarbon generation.For the K Formation,the lower part is mature while the upper part is low mature.The hydrocarbon generation simulations indicate that source rocks of the lower part of K Formation reached the hydrocarbon generation threshold during the late stage of early Cretaceous and maturation during the early stage of late Cretaceous.However,the upper part of K Formation has not come into mature stage during the geological time and it is still low mature at present.The characteristic of saturated hydrocarbon biomarkers indicates that the source rock of the K Formation was deposited in fresh water- semi-saline water and weak oxidizing-weak reducing lacustrine sedimentary environment.The organic matter is a mixture of lacustrine facies.
ZENG Yan-tao,WEN Zhi-gang，SONG Huan-xin . Geochemical Characteristics of the Source Rock of K Formationin the Western Sag of Bongor Basin,Chad[J]. Natural Gas Geoscience, 2012 , 23(6) : 1121 -1126 . DOI: 10.11764/j.issn.1672-1926.2012.06.1121
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