Abstract:

Bai-58 well of Baiquan area on the northwestern margin of Junggar basin is a complex fault-block area cut by multiple faults with variable dip of layers and the distribution of multiple faults. The old 3D seismic data section in the Bai-58 well region show the poor continuity of seismic events, poor imaging data near the fault zone, the unclear contact relationship between strata. And it is difficult to explain fine structure. In order to obtain the fine structure of sedimentary in the study area, we use various processing technologies such as pre-stack multi-domian noise attenuation and non-linear pre-stack time migration for doing high-resolution 3D seismic reflection data on base of the analysis of the raw seismic data and problems. New results reveal the development characteristics, spatial distribution patterns and the relationship of surface composition of Bai-Wu fault. According to the section showing the strata thickness, structural feature, and characteristics of the seismic reflection wave group, the study area is divided into the three major structural layers, which are Permian, Triassic, Jurassic-Cretaceous structural layer. The different tectonic feature of the three major structural layer, is divided the study area into the western thrust belt, central fault-step zone, and eastern slope tectonic zone.

Key words: Bai-58 well area, pre-stack noise attenuation, signal to noise ratio, pre-stack migration, tectonic units, fault belt