潜山水平井时-深域轨迹匹配技术及在锦州25-1南地区地质建模中的应用

Time-depth trajectory matching technique for buried hill horizontal wells and its application in geological modeling of Jinzhou 25-1 south area

针对复杂潜山油藏,由于该类油藏纵向上潜山地层与上覆地层层速度差异大,横向上潜山顶面构造起伏大,导致潜山水平井时间域轨迹形态复杂,与深度域轨迹匹配难度大。首先开展了基于不同潜山顶面形态的水平井时-深域轨迹理论形态研究,研究结果表明,潜山水平井时间域轨迹形态与潜山顶面形态关系密切,其整体趋势与潜山顶面趋势一致;在理论研究的基础上,结合渤海锦州25-1南太古宇变质岩潜山油藏实际情况,利用一体化研究PETREL平台创新提出了构建基于若干虚拟直井的水平井拟时深关系(MD&TWT),实现了潜山水平井时间域轨迹与深度域匹配,为基于地震属性约束的油藏精细地质建模提供借鉴。锦州25-1南油田生产实际证明,基于时-深域匹配的轨迹建立的油藏三维地质模型更加接近地下油藏实际。

In the complex buried hill reservoir,since there is a great difference in the interval velocity between the buried hilland overlying stratalongitudinally,the top surface of the buried hill is undulating horizontally,the time domain trajectory of the buried hill horizontal well is complicated and difficult to match to that in depth domain.This paper starts with the study on the theoretical form of the time-depth domain trajectory of the horizontal well under different buried hill top forms.The results show that there is a close relationship between the time domain trajectory form of buried hill horizontal well and the morphology of buried hill top,and its overall trend is consistent with that of buried hill top.On the basis of theoretical research,combining the actual situation of JZ25-1Sburiedreservoir in Bohai bay in China,a pseudo time-depth relationship(MD&TWT)based on a certain number of virtual wells is put forward in Petrel platform,and the matching of the buried hill horizontal well in time domain and in depth is realized.It lays a foundation for fine geological modeling of oil reservoirs based on seismic attribute constraints.The real reservoir performance of the oilfield proves that the 3D geological model based on the accurate time-depth domain matched trajectories of the horizontal wells is closer to the true state of the underground reservoir.