沉积学报2017，Vol.35Issue(6)：1241-1253,13.DOI:10.14027/j.cnki.cjxb.2017.06.015
渤海湾盆地南堡凹陷古近系重力流沉积特征及模式
Sedimentary Characteristics and Model of Paleogene Gravity Flow in Nanpu Sag, Bohai Bay Basin
摘要
Abstract
Based on the microscopic description of core, macroscopic observation, 3D seismic data interpretation and previous research results, this paper studied the sedimentary characteristics, patterns and influencing factors of the gravity flow in Paleogene of Nanpu sag. Research results show that:Slump rock, Sandy debris flow, Turbidity flow is the mainly types of gravity flow deposit in Nanpu sag. Among them,the development degree of sandy debris flow is the highest. Cumulative thickness of single well drilling is 220 m, single layer thickness is up to 30 m. Cumulative grain-size distribution curve largely present two stages, C-M diagram is parallel to the QR segment,this Shows the origin of the deposited non-traction flow;Turbidity flow develops positive grading. Single layer thickness is less than 1 m but it has characteristic of multiple stage development. Incomplete BaoMa sequence can be seen in it and Tc Period is easier to see but Td Period is rare. Turbidity flow is commonly found in the outer and upper parts of sandy debris flow depos-it;the size of slump rock particle is smaller, crumpled structure and convolute bedding are extremely developed, the development degree of slump rock is higher in structure 4. Shaleitian, Matouying and other uplifts, active volcano, fault activity and earthquake in Paleogene, deep water environment of Dongying Formation and Shahejie Formation, as well as slope break zone provide the conditions for gravity flow deposition. Finally, considering the various factors we establish gravity flow sedimentation model of fan delta-short steep slope type ( structure 1,4) and Braided River Delta-long ramp type( structure 2,3) for Nanpu sag, and then this paper analyzes different deposition rules of them.关键词
南堡凹陷/重力流/古近系/沉积特征及模式/渤海湾盆地Key words
Nanpu sag/gravity flow/Paleogene/sedimentary characteristics and model/Bohai Bay Basin分类
能源科技引用本文复制引用
张景军,李凯强,王群会,王志坤,韩江波..渤海湾盆地南堡凹陷古近系重力流沉积特征及模式[J].沉积学报,2017,35(6):1241-1253,13.基金项目
国家自然科学基金项目(41472125)[National Natural Science Foundation of China, No.41472125] （41472125）
