复杂断块不整合地层地质建模方法

Geological modeling method for stratigraphic unconformity in complex fault block

周连敏 王晶晶 林火养 贾晨 庄红妹 程立

中国石油大港油田公司勘探开发研究院，天津 300280

Research Institute of Exploration and Development, Dagang Oilfield Company, PetroChina, Tianjin 300280, China

复杂断块油藏内断层多，储层相变快，给精细地质建模带来了极大的难度。大港油田C区各级断层相对发育，目的层沙二段底部还存在着地层不整合，给地质建模工作带来了又一个难题。文中建模研究首先采用井震协同约束分级建立断层模型，再通过线性变速度法对地震解释层位数据进行时深转换，保证了时间域和深度域的地层剥蚀线位置完全吻合，最后选取合适的地层叠置类型进行层面内插，保证了模型符合研究区构造特征。依靠地震反演数据结合井上岩性数据建立的岩相模型，其精度远高于波阻抗反演数据体，还能较好地刻画隔夹层的分布。模型成果在后期油藏数值模拟中应用效果较好，反映了文中建模方法的可靠性，该方法也对其他复杂断块不整合地层的地质建模研究提供了借鉴意义。

It is very difficult to build geological modeling for the much developed faults and fast changed reservoir in complex fault block reservoir. The relatively developed faults at all levels in the C area of Dagang Oilfield and the stratigraphic unconformity at the bottom of the Es2 section bring another problem to geological modeling. In this research, first, this modeling is built on well-seismic and constrained fault at different levels, and seismic interpretation layer data is time-depth conversed by linear variable velocity method, ensuring the position of the formation denudation line between the time domain and the depth domain is fully consistent; then, the suitable stratigraphic superposition type is selected to interpolate, which ensures that the structural model conforms to the structural features in the study area. With seismic inversion data and lithology data, the established lithofacies model reaches a precision much higher than the impedance inversion data, and the distribution of interlayer can also be well depicted. The model application has better effect in the later reservoir numerical simulation, which reflects the reliability of the modeling method and also provides a reference for the geological modeling in unconformable strata of other complicated fault blocks.

10.6056/dkyqt201802010