西安石油大学学报（自然科学版）2025，Vol.40Issue(3)：12-25,14.DOI:10.3969/j.issn.1673-064X.2025.03.002
吴起—定边地区延长组长7段深水沉积特征及沉积模式
Deep-water Sedimentary Characteristics and Sedimentary Model of Chang 7 Member of Yanchang Formation in Wuqi-Dingbian Area
摘要
Abstract
Gravity flow sand bodies deposited in deep-water lacustrine basins are favorable targets for unconventional oil and gas explo-ration.According to the theory of deep-water gravity flow deposition in continental lake basin,the types and characteristics of deep-water gravity flow deposition,the genesis and sedimentary mode of gravity flow in Chang 7 member of Yanchang Formation in Wuqi-Dingbian area were studied by comprehensive utilization of core observation,grain size analysis and logging curves.The results show that there are abundant types of deep-water deposits in the Chang 7 member of the study area,and three types of gravity flow deposits are mainly de-veloped:slump deposits,sandy debris flow deposits and turbidity current deposits.The main geneses of gravity flow include trigger mech-anism,lake basin shape and sediment source,and different types of gravity flow superimposed vertically.The gravity flow deposition process of Chang 7 member is summarized in three stages:the deposition stage of from delta front sand body to semi-deep lake slope slump sand body,the deposition stage of from semi-deep lake slump sand body to sandy debris flow,the deposition of from semi-deep lake-deep lake sandy debris flow to turbidity current.The non/restricted channel microfacies of Chang 7 member are the most devel-oped,which controls the distribution of hydrocarbon and is the key type of oil exploration in the next step.关键词
重力流/深水沉积/长7段/延长组/吴起—定边地区Key words
gravity flow/deepwater sedimentation/Chang 7 member/Yanchang Formation/Wuqi-Dingbian area分类
石油、天然气工程引用本文复制引用
张龙飞,白玉彬,闫新智,薛宁,李鹏程,赵靖舟,张宇轩..吴起—定边地区延长组长7段深水沉积特征及沉积模式[J].西安石油大学学报（自然科学版）,2025,40(3):12-25,14.基金项目
陕西省自然科学基础研究计划项目(2017JM4014) （2017JM4014）
