阿萨巴斯卡油砂下白垩统McMurray组沉积演化特征  

Sedimentary Evolution of the Lower Cretaceous McMurray Formation,Athabasca Oil Sands

作　　者：陈浩[1] 黄继新[1] 刘尚奇[1] 武军昌[1] 孙天建[1] Chen Hao;Huang Jixin;Liu Shangqi;Wu Junchang;Sun Tianjian(Research Institute of Petroleum Exploitation and Development, Beijing 100083, China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《地质科技情报》2018年第3期92-98,共7页Geological Science and Technology Information

基　　金：美洲地区超重油与油砂有效开发关键技术(2016ZX05031);国家自然科学基金项目(41472119)

摘　　要：综合钻井、岩心照片、露头和测井曲线,基于前人关于区域地质研究成果,重点研究了加拿大阿萨巴斯卡油砂下白垩统McMurray组沉积演化特征。结果表明,油砂储层内发育以砂岩为主的9种岩石相;目的层下、中、上3段地层的发育体现了由河流相过渡到三角洲平原亚相再到河口湾相的完整海侵沉积序列。地层纵向上,中、下部层序以河流、三角洲沉积为主,物源主要来自盆地东部。河流汇入盆地后沿盆地长轴南北向发育,成为区块北部的长物源;上部层序受西北方向北海海侵影响,自南向北发育河流相-三角洲平原亚相-河口湾相沉积。在分析储层沉积演化过程的基础上,建立了阿萨巴斯卡油砂下白垩统McMurray组不同层段的沉积模式。研究成果既能为油砂储层的井位部署提供合理的地质依据,也能为沉积环境类似的油气聚集区勘探开发工作提供借鉴。Based on drilling,cores,outcrops,logging data and previous regional geological studies,this study intends to reveal sedimentary evolution of the Lower Cretaceous McMurray Formation,Athabasca oil sands.Results indicate that there are nine lithofacies in McMurray Formation.The depositional environments of sub-divided three layers in the formation evolve from fluvial to delta plain,and to estuary sequence,which indicates a transgressive system tract.Vertically,fluvial and delta-plain deposits constitute the lower and middle strata.The deposits are sourced from the eastern part of the Western Canadian Sedimentary Basin.Fluvial deposited along the long axis of the basin and stretched in a south to north orientation.The upper sequence is influenced by northwest transgression of the Boreal Sea.The fluvial-delta plain-estuarine sedimentary system is distributed from south to north.Based on the analysis of sedimentary evolution,depositional models for different layers of the Lower Cretaceous McMurray Formation in the Athabasca oil sands are established.This study can provide not only a reasonable geological basis for well design,but also one reference for exploration and development of similar oil and gas fields.

关 键 词：加拿大油砂 下白垩统 海陆过渡环境 沉积演化 

分 类 号：TE121.3[石油与天然气工程—油气勘探]