东北石油大学学报2025，Vol.49Issue(3)：1-13,13.DOI:10.3969/j.issn.2095-4107.2025.03.001
四川盆地西部下侏罗统珍珠冲段沉积体系特征及控制作用
Characteristics and control effect of the sedimentary system of Lower Jurassic Zhenzhuchong Member in Western Sichuan Basin
摘要
Abstract
The Zhenzhuchong Member is vertically adjacent to the hydrocarbon generating center of Xuji-ahe Formation in Western Sichuan Basin which is a potential layer for unconventional tight oil and gas exploration.Based on the analysis of 2D lattice profile,outcrop,core data,drilling and logging data,the palaeogeomorphology of Zhenzhuchong Member was restored,and the type and control effect of sed-imentary system of Zhenzhuchong Member were defined.The results show that the Zhenzhuchong Member in Western Sichuan has a paleo geo m orphic pattern of high in the west and low in the east,with three palaeo-geomorphic units:palaeo-gully,palaeo-slope and palaeo-remnant hill.The types of sedi-mentary systems in northwestern,central and southern Sichuan Basin are obviously different.Among them,due to the strong tectonic activity and abundant source supply of Longmenshan,fan delta sedi-mentary mainly composed of gravel was developed in northwest Sichuan Basin.The Longmenshan tec-tonic activity is weakened in the central part of Western Sichuan Basin,and proximal alluvial fan-braided river delta deposits are developed.In the relatively quiet period of Longmenshan tectonic activity in southwest Sichuan Basin,meander river delta sediments mainly composed of fine sandstone were devel-oped.Lacustrine sedimentary systems are widely distributed in the west and north Sichuan depressions.The palaeogeomorphology control the sediment space,affect the sediment transport path and accumula-tion location,and then determine the type and distribution of sedimentary system in the Zhenzhuchong Member of the Western Sichuan Basin.This result is of guiding significance for the exploration of conti-nental tight gas in the Sichuan Basin.关键词
沉积体系/古地貌/控制作用/珍珠冲段/下侏罗统/四川盆地西部Key words
sedimentary system/palaeogeomorphology landform/control effect/Zhenzhuchong Mem-ber/Lower Jurassic/Western Sichuan Basin分类
天文与地球科学引用本文复制引用
夏建港,李琦,陈贺贺,朱珍君,郭莉,张利红,赵牛斌..四川盆地西部下侏罗统珍珠冲段沉积体系特征及控制作用[J].东北石油大学学报,2025,49(3):1-13,13.基金项目
中国石油化工股份有限公司科技项目(P23202) （P23202）
中国石油化工股份有限公司科技项目(P24005) （P24005）
中国石化中原油田科技项目(2023BY03) （2023BY03）
