吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (6): 1615-1627.doi: 10.13278/j.cnki.jjuese.20190195
• 地质与资源 •
陈贤良1,2, 纪友亮2, 杨克明3
Chen Xianliang1,2, Ji Youliang2, Yang Keming3
摘要: 为了深入认识川西坳陷中段须四段层序地层格架内沉积特征,综合利用野外露头、地震、岩心、测/录井、分析测试等资料对其进行了系统分析。结果表明须四段为一个三级层序,根据层序界面特征划分出低位体系域、湖侵体系域和高位体系域,并建立了等时层序地层格架。依据沉积相标志识别出冲积扇、辫状河、辫状河三角洲和湖泊4种相类型,明确了层序地层格架内沉积相平面展布及纵向演化特征:平面上,短轴物源自龙门山山前依次发育冲积扇、辫状河、辫状河三角洲和湖泊相,长轴物源主要发育辫状河三角洲前缘沉积,长短轴物源在合兴场-德阳-马井-新繁镇一带地区交汇;纵向上,低位体系域和高位体系域时期以辫状河三角洲前缘沉积为主,水下分支河道砂体纵向叠置、横向连片、分布广泛,湖侵体系域时期以滨浅湖沉积为主。建立了层序-沉积充填模式,指出低位体系域和高位体系域时期的长轴物源和长短轴物源交汇区辫状河三角洲前缘水下分支河道砂体是研究区优质储层发育区。
中图分类号:
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