地震低频异常属性在渤海Q油田油气检测中的应用研究

Application of low frequency abnormal seismic attribute analysis for hydrocarbon identification in Bohai Q oilfield

渤海Q油田含油层系主要发育在明化镇组下段和馆陶组上段。油田进入大规模调整以来,为应对风险井位快速实施以及精细挖潜,需对部分潜力砂体快速进行含油性定性评价。通过地震波吸收衰减分析技术,对油田西区X潜力砂体的含气性预测进行了应用研究。研究区探井的油水层的频谱分析表明,存在"低频增加、高频衰减",且油层的低频增加更明显的现象。在此认识的基础上,利用广义S变换计算了潜力区的低频增加梯度(LFG),进行了潜力区的含油气性的综合预测,预测结果跟实际钻井结果对比具有很高的符合率,同时应用该技术还指导了油田后续多口水平井的高效实施。

The oil-bearing layers of Bohai Q oiHield is mainly developed in Minghuazhen and lower Gresponse to the rapid implementation of oil wells drilling and iine potential tapping, it needs to tial of the ol sands rapidly. For this reason, we conduct the research on predicting gas -babsorption and attenuation analysis techniques. This paper mainly expounds the basic principles and methattenuation analysis, discusses the advance of the generalized S transform algorithm by spectrum analysis. By studying the main ol layers’ spectrumanalysis for the explorationwells, itshows the phenomenon of the low -frequency increases, the high -fre-quency attenuation and low -frequency mcrease more obvious in the ol reservoirs. With this understanding, this paper calcu-lated the low -frequency mcrease gradient （LFG）in the potential region based on the use of the give a comprehensive prediction for the potential hydrocarbon zones. According to the comparison between the predictions anddrilling results, it has a high compliance rate. At the same tme, the application of the technology also plementation of the subsequent horizontal wells.