中国石油大学学报（自然科学版）2017，Vol.41Issue(4)：36-45,10.DOI:10.3969/j.issn.1673-5005.2017.04.005
济阳坳陷东营三角洲前缘斜坡重力流成因砂体特征及形成条件
Characteristics and formation condition of gravity flow developing in low-lying slope zone of Dongying delta in Jiyang Depression
摘要
Abstract
The latest deep-water gravity current theory was used to subdivide the type of the gravity flow developed in the low-lying slope zone of large delta, and the discerning standards were established;and then the controlling factors of the distribu-tion were discussed. The results show that a series of gravity flows can be developed in the low-lying slope zone of the large delta. The sand body formation however is not determined by one certain flow state, but always by several flow states inclu-ding plastomer, debris flow and turbidite. They transform in order and have different lithofacies associations. According to the different longitudinal sequential patterns, the gravity flow could be divided into four types, which include the slide sand, the slump sand, the debris flow sand and turbidite. By comparative analysis of sedimentary structure characters, grain size characters, logging face and seismic face, the sand type could be identified. The controlling factors of the formation and dis-tribution of gravity flow which developed in the low-lying slope zone of large delta include ancient material source, ancient sedimentary slope angle, contemporaneous fault and depositional base-level cycle. Ample material source is the material base for the development of gravity flow, and different types of sands could transform in order when the slope has suitable sedimen-tary angle. The decreasing plate of codeposition fault is the favorable development area, and the depositional base-level cycle controls the longitudinal distribution of the gravity flow sands.关键词
三角洲前缘斜坡/重力流成因砂体/砂质碎屑流/识别标志/东营凹陷Key words
low-lying slope zone of large delta/gravity flow/debris flow/identification mark/Dongying Sag分类
能源科技引用本文复制引用
刘鑫金,刘惠民,宋国奇,刘卫东,王小玉..济阳坳陷东营三角洲前缘斜坡重力流成因砂体特征及形成条件[J].中国石油大学学报（自然科学版）,2017,41(4):36-45,10.基金项目
中石化重大专项(ZDP17008) （ZDP17008）
