渤海湾盆地南堡凹陷古近系重力流沉积特征及模式

发布时间：2018-01-25 04:02

本文关键词： 南堡凹陷重力流古近系沉积特征及模式渤海湾盆地　出处：《沉积学报》2017年06期 　论文类型：期刊论文

【摘要】：利用岩芯微观描述、宏观观察,三维地震资料解译处理等技术并参考前人研究成果对南堡凹陷古近系重力流沉积特征、模式及影响因素进行了研究。结果表明凹陷主要发育滑塌岩、砂质碎屑流沉积、浊积岩三种重力流沉积物,其中砂质碎屑流沉积发育程度最高,单井钻遇累计厚度达220 m、单层厚可达30 m,粒度概率累积曲线大都呈现两段式,C-M图与QR段平行,显示沉积的非牵引流成因;浊积岩具有多期发育的特征,单层厚多小于1 m,具有正粒序层理,发育不完整鲍马序列Tc段常见Td段少见,常见于砂质碎屑流沉积外围及上部;滑塌岩颗粒粒级较细,揉皱构造和包卷层理极为发育,在4号构造发育程度较高。沙垒田、马头营等凸起,古近系活跃的火山、断层活动及地震,东营组及沙河街组发育期深水环境、坡折带的存在为重力流沉积的形成提供了条件。综合各种因素为研究区建立了扇三角洲—短陡坡型(1号、4号构造)及辫状河三角洲—长缓坡型(2号、3号构造)重力流沉积模式并对其沉积规律进行了分析。
[Abstract]:The use of micro macro observation, core description, interpretation of 3D seismic data processing technology and the results of previous studies on Paleogene gravity flow sedimentary characteristics of Nanpu Sag, pattern and influencing factors were studied. The results showed that the major depression slump rock, sandy debris flow deposition, turbidite sediment gravity flows three among them, the sandy debris flow deposits developed in the highest degree, with the thickness of 220 m drilling wells, the layer thickness was 30 m, mostly showing the probability cumulative grain size curves of two segments, C-M map and QR parallel, non traction causes showed deposition; turbidite has the characteristics of multi period development, multi layer thickness less than 1 m, with positive graded bedding, incomplete development of Bouma sequence Tc common Td rare, common in the sandy debris flow deposits and the upper periphery; slump rock particles with fine grains, crumple structure and convolute bedding is growing in the No. 4 structure development A higher degree. Shaleitian matouying uplift, etc., the Paleogene active volcano, fault activity and earthquake, Dongying group and Shahe Street Group during the development of deepwater environment, provide the conditions for the formation of slope belt there is gravity flow deposition. The comprehensive factors established fan delta short steep slope type research zone (No. 1, No. 4 structure) and Braided River Delta - long ramp (No. 2, No. 3 structure) model of gravity flow sediments and the sedimentary laws were analyzed.

【作者单位】：东北石油大学地球科学学院;中国石油冀东油田勘探开发研究院;
【基金】：国家自然科学基金项目(41472125)~~
【分类号】：P618.13
【正文快照】： 0引言20世纪中期前,绝大多数地质学家们都认为深海是幽深静谧之地,沉积物的形成是缓慢的,来源主要为悬浮沉积物且仅存在泥质沉积[1],直至《浊流是递变层理的形成原因?》一文[2]的发表才结束了人们对深海沉积物的片面认识,标志着浊流理论的正式建立,也拉开了深水重力流研究的序

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