渤海Q油田开发中后期高精度变速成图方法研究

Study on high precision variable-velocity mapping method in the middle-later developed period of fluvial oilfield development: a case study from Q oilfield, Bohai Bay

时深转换及构造成图是连接地球物理和地质研究的桥梁,其准确程度对油田高效开发具有重大意义。对于底水油藏的开发而言,时深转换的精度更是制约水平井成功与否的关键。Q油田经过十多年的注水开发,底水突破严重,水淹程度高,调整井部署时油柱高度相对较低,油田开发难度加大,地质油藏方案对构造研究的准确程度提出了更高的需求。针对这一问题,根据储层地震响应特征,提出了基于加密解释与自动追踪相结合的井-震-藏联合微幅构造解释技术,探索改进了精细的层控速度建模和应用外部漂移克里金算法的构造成图技术,通过上述两项技术的有力结合,极大地提高了微幅构造的研究精度,为开发井的部署实施提供了借鉴,后续开发井的实施也验证了该项研究的准确性。

Time depth conversion and structural mapping are the bridges of Geophysics to geological research,and the accuracy is of great significance to the efficient development of oilfields.For the development of bottom water reservoir,the accuracy of time depth conversion is the key to the success of horizontal well.Q oilfield has been used in water injection stage for more than 10 years.The water cone breakthrough is serious,and the flooding is high.The oil column height is relatively low when the adjustment wells are deployed,so it is difficult for the oil field development.The accuracy of structural map is placing a heavier demand for geological research.In order to solve this problem,a delicate research flow is established.According to the seismic reflection of reservoir characteristics,the well-seismic-reservoir integrated interpretation is presented based on effective infilled interpretation and automatic tracking.To accurately implement the micro structure,surface controlled velocity modeling and external drift Kriging algorithm for mapping is explored.The workflow provides a strong support for the development of well deployment and implementation.The accuracy of the research is verified by the further development well.