渤南低凸起中段古近系沙一二段源汇体系研究及勘探意义

The source to sink systems and their exploration significance for the 1st and 2nd members of the Palaeogene Shahejie Formation in the middle part of the Bonan low uplift

关键词:  渤南低凸起  沙一、二段  源汇耦合控砂原理  沉积体系  储层预测

Key words:  Bonan low uplift  1st and 2nd members of the Palaeogene Shahejie Formation  source to sink coupling  depositional system  prediction of reservoir rocks

摘要:

源汇耦合控砂原理在渤海油田储层预测中取得了良好应用效果，使得渤海古近系储层预测的成功率由原来的40%提高到了80%。在对渤南低凸起中段沙一、二段储层研究中，以源汇耦合控砂原理为指导，利用渤南低凸起及围区的钻测井、地震资料，识别物源区的母岩类型，刻画物源区范围，分析供源能力，研究沉积物搬运过程中的沟谷、坡折带类型及分布特征。将沉积体系形成的关键要素相结合，构建物源-沟谷-沉积体系的耦合关系，分析渤南低凸起中北段BZ22/23构造区沙一、二段沉积体系展布特征，预测该区沙一、二段优质储层的分布，为BZ22/23构造区沙一、二段油气勘探提供有力支持。

Abstract:

The study of the source to sink systems has become a hot topic in earth sciences at home and abroad. In the present paper, the sandbody-controlling principle of source to sink coupling has been successively applied to the prediction and assessment of the reservoir rocks in the Bohai oil field. With the aid of well logs, seisic data, type and supply capacity of the source rocks, the highlights are concentrated in the study of the type and distribution of valleys or channel geometry and slope break in order to construct the coupling relationship of the source to sink systems and depositional systems in the 1st and 2nd members of the Palaeogene Shahejie Formation in the middle part of the Bonan low uplift. The results of research in this study may be significant for the understanding of basin filling processes and sedimentary system distribution, and thus may offer one useful approach to the prediction of the medium-deep reservoir rocks and oil gas exploration.