Effect of the Chepaizi-Mosuowan Paleo-Uplift on the depositional system of the Xishanyao Formation in Shixi Area based on depositional forward modeling

doi:10.3969/j.issn.1006-6535.2026.01.004

Abstract

Abstract: In the southern part of the Luliang Uplift Shixi Area of the Junggar Basin,the Xishanyao Formation(J₂x)offers favorable oil and gas prospects,but studies on its tectono-sedimentary system have been relatively limited.Thus, based on well logs,seismic data,core samples,employing Dionisos forward modeling and the sediment distribution related to the Chepaizi-Mosuowan Paleo-Uplift and its margins were characterized.The results showed that during J₂x deposition,the Chepaizi-Mosuowan Paleo-Uplift was a low-amplitude NE-SW trending anticline that underwent rapid uplift during the J₂x₂,J₂x₃ and J₂x₄ stages,producing stratigraphic overlap and deposition missing.A dual provenance sedimentary system from the north and northeast gradually interfingered and merged into a single deltaic deposition system in the J₂x₃ and J₂x₄,developing various sub-facies such as underwater distributary channels,inter-distributary bays and mouth bars.Variations in the uplift rate of the Chepaizi-Mosuowan Paleo-Uplift controlled the coupling between accommodation space and sediment supply,thereby influencing sediment distribution;the coarse-grained fan deposits derived from this source constituted favorable reservoir sand body.This study provides valuable guidance for research on the J₂x sedimentary system in the Shixi Area.

Key words: depositional forward modeling, sedimentary evolution, Chepaizi-Mosuowan Paleo-Uplift, Xishanyao Formation, Junggar Basin

CLC Number:

TE121.3

FU Lei, XIE Lei, LI Junfei, ZHANG Chunguang, HAN Zijian, WANG Xuehua, ZHANG Jianguo, WANG Runchao. Effect of the Chepaizi-Mosuowan Paleo-Uplift on the depositional system of the Xishanyao Formation in Shixi Area based on depositional forward modeling[J]. Special Oil & Gas Reservoirs, 2026, 33(1): 33-42.

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