尼日尔三角洲盆地深水区E油田A油组发育重力流水道复合体沉积,由于内部水道期次多,叠置关系复杂,导致油田开发难度较大.通过对地震资料、测井曲线、岩心照片等资料的分析,梳理了A油组重力流水道复合体的沉积特征,探讨了水道复合体期次解剖的级次问题,明确了复合水道期次解剖具有实际应用价值,并提出基于井-震联合多级旋回对比的复合水道期次解剖方法.首先,以岩心资料为基础,总结深水重力流复合水道的期次界面标志,其次,划分岩心尺度水道期次,并结合测井资料确定测井尺度复合水道期次,最后,通过井-震联合确定地震尺度的复合水道期次,并进行追踪解释.最终建立基于成因分析的复合水道沉积演化模式.

Gravity flow channel complex is developed in A oil layer of E Oilfield in deep water area of Niger Delta Basin. The multiple phases of channels and complex stacking relations of them lead the difficulty to develop the oilfield. Based on the analysis of seismic data, well logging and core photos, the sedimentary characteristics of gravity flow channel complex of A oil layer is illustrated, the level of phase anatomy of channel complex is discussed, and it is suggested that the phase subdivision of composite channel is very practical. The method of phase subdivision by the way of multi-stage cycle correlation from well data to seismic data is proposed. Firstly, based on the core data, the phase and interface marks of deep water gravity flow composite channel are summarized, secondly, the core-scale phase of composite channel is divided, and the logging-scale phase of composite channel is determined by combining with logging data, finally, the seismic-scale phase of composite channel is determined by combining well and seismic data, and the seismic tracking interpretation is carried out. At last, on the basis of genetic analysis, a sedimentary evolution model of composite channel is established.