非线性约束储层反演技术在卫城油田的应用

Application of nonlinearly constrained reservoir inversion technique in Weicheng Oilfield

常规线性地震反演储层预测可以得到区域大套砂体的展布特征,但对于滚动勘探需要的认识到砂组乃至小层级别的要求是不够的.在对地震资料和测井资料进行目标处理的基础上,采用构造—测井共同约束下的非线性反演技术,得到清晰的储层构造认识,为油田部署调整提供依据.在卫城油田卫北地区的滚动勘探目标研究过程中,通过地震和测井资料目标处理,使老资料提高了分辨率,凸现了砂体特征,然后通过更能反映地震资料数学特征的非线性地震反演,清楚地识别出薄层砂体,并得到了钻井资料的良好验证.实践证明通过非线性约束储层反演进行储层预测,对于认识储层和地层对比,解释和验证构造具有重要作用,是滚动勘探开发研究的重要工具.

Linear seismic inversion can only predict the distribution feature of thick sandbodies, but it can’t obtain the knowledge of the thin layer such as substratum to meet the demands of progressive exploration. Based on processing the seismic and log data of target, the distinct knowledge of the structure of the reservoir can be gained by means of the nonlinear seismic inversion constrained by structure and log conditions, which can guide the adjustment of oilfield deployment. This study method is used in the progressive exploration of Weibei area in Weicheng Oilfield. The target processing of the seismic and log data improves the resolution of the old data, and then the thin sandbodies are clearly recognized by nonlinearly constrained inversion, which are verified by drilling data. The fact demonstrates that nonlinearly constrained inversion has important function to the knowledge of reservoirs and the interpretation and verification of structures, and it is also an important tool to guide progressive exploration.