Seismic simulation and attribute analysis of Jurassic fluvial reservoirs in the P6 region, Xinjiang

Abstract

Fluvial reservoirs are crucial for oil and gas exploration. In the Jurassic formations of Chepaizi anticline, ancient channels can be identified based on seismic facies similar to incised valleys. This study focuses on three key issues. Firstly, it aims to demonstrate the capability of spectral decomposition interpretation in distinguishing ancient channels. Secondly, it aims to prove that the incised valleys in the Jurassic formations of Chepaizi are ancient channels. Thirdly, given that the Jurassic is a new layer for oil and gas exploration in the region, it aims to identify the distribution of ancient channel and conglomerate. To address these issues, we conducted a seismic wave forward simulation study on channels and used spectral decomposition to interpret seismic data. The results show that: (1) Spectral decomposition can differentiate channels of different thicknesses, where low-frequency components correspond to thick channels and high-frequency components correspond to thin channels. (2) Using multi-attribute and multi-parameter fusion method can identify the fluvial sand body boundary. (3) The width of the channel in P6 area ranges from 400 to 1700 m, with an area of 78 km2. The fluvial sand bodies are generally distributed along the slopes. Few sandstones and conglomerates are distributed at the bottom of the channel. We conclude that further exploration should focus on the fluvial channel delta in the southeast of the study area.