多瑟欧盆地烃源岩发育特征及勘探建议
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张懿(1992—),男,湖南邵阳人,工程师,在读硕士研究生,从事石油地质研究。E-mail:zhangyi920407@163.com。

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Development characteristics and exploration suggestions of source rocks in Doseo Basin
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    摘要:

    位于中非剪切带中部的多瑟欧盆地为走滑-拉分盆地,勘探程度较低,一直未获得商业发现,而与之相邻且具有相似地质背景的多巴盆地却相继获得油气大发现。为此,基于仅有的钻井、测井和地震等资料,对盆地烃源岩发育特征开展初步但较为系统的研究。结果表明:多瑟欧盆地发育十分优越的早白垩世阿普第期中-深湖相倾油型泥质烃源岩,厚度大,有效烃源岩分布广,生排烃潜力巨大;东部有效生烃灶为富生烃凹陷,其烃源岩厚度及平面分布规模、地化指标、生排烃强度及生排烃量均远优于西部有效生烃灶,生排烃史与圈闭形成时间、垂直运移通道-断层的发育时间匹配良好。据此提出勘探建议:①应对研究区给予高度关注,并加大勘探力度。②采集三维地震资料以便于开展基础地质及石油地质深入研究。③优选有利勘探区带,争取获得优质区块,尽早在该盆地获得油气大发现。

    Abstract:

    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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张懿,李俊良,郑求根,胡琴.多瑟欧盆地烃源岩发育特征及勘探建议[J].油气地质与采收率,2022,29(2):61~68

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  • 在线发布日期: 2022-06-21
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《油气地质与采收率》
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