Development characteristics and exploration suggestions of source rocks in Doseo Basin

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    The Doseo Basin,located in the center of the Central African Shear Zone(CASZ),is a strike-slip pull-apart basin with a low exploration degree and has not been discovered commercially. However,the adjacent Doba Basin with similar geological backgrounds has seen successive oil and gas discovery. Therefore,with the existing drilling,logging,and seismic data,this paper carried out a preliminary but systematic study on the development characteristics of source rocks in the Doseo Basin. The results show that the Aptian(Early Cretaceous)middle-deep lacustrine and argillaceous source rocks with oil potential are well developed in the Doseo Basin,featuring great thickness,wide distribution of effective source rocks,and huge hydrocarbon generation-expulsion potential. The eastern hydrocarbon generation kitchen is a hydrocarbonrich sag with its source-rock thickness,plane distribution scale,geochemical indexes,and hydrocarbon generation-expulsion intensity and amount much better than those in the western hydrocarbon generation kitchen. The hydrocarbon generation-expulsion history matches well with the formation time of traps and the development time of vertical migration channels and faults. Three exploration suggestions are put forward:①pay close attention to the Doseo Basin and increase explo?ration efforts,②collect 3D seismic data and carry out in-depth research on basic geology and petroleum geology,and ③se?lect favorable exploration zones to obtain high-quality blocks and large oil and gas discovery in the basin as soon as possi?ble.

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  • Online: June 21,2022
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