柴达木盆地砂西E_3~1油藏构造再认识

Recognition of Structure of Shaxi E_3~1 Reservoir in Qaidam Basin

砂西油田E_3~1油藏位于柴达木盆地西部南区,是柴达木盆地西部坳陷尕斯库勒断陷亚区内的一个三级潜伏构造[8],基本呈断鼻状分布,被若干不同性质的断层复杂化.多年以来,虽然经过多轮次的地震勘探,但由于受地震资料品质的影响,构造形态、断裂展布、油水关系一直不清.文章利用新采集的三维地震数据体,开展精细构造解释,在以往构造评价和储层评价的基础上,通过对E23、E_3~1及主要油层组的精细构造解释,准确落实构造形态,刻画断裂的分布规律,为油田的后续开发,提供了有力的技术支撑.

The Shaxi E 1 3 reservoir is located in the southwest of Qaidam Basin, which is a tertiary latent structure buried in the Gasikule depression of western Qaidam Basin. It is basically a broken nose distribution and is complicated by a number of different properties of the faults. Although several seismic exploration surveys were conducted during the past decades, the structural features, fault distribution, and oil-water relationships remain unclear due to the influence of the quality of seismic data. In this paper, we use the newly acquired 3D seismic data volume to carry out the structural interpretation. Based on the previous structural and reservoir evaluation, the fine structural interpretation of E 2 3, E 1 3 and major oil reservoirs are used to accurately determine the structural features and characterize the distribution of fractures, which provide strong technical support for subsequent development of the oil field.