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首页> 中文期刊> 《地学前缘》 >水道加朵体型深水扇形成机制与模式：以白云凹陷荔湾3-1地区珠江组为例

水道加朵体型深水扇形成机制与模式：以白云凹陷荔湾3-1地区珠江组为例

         
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摘要

深水扇储层的沉积特征是油气勘探开发中的一个热点问题。通过分析珠江口盆地白云凹陷荔湾3-1地区珠江组深水扇的沉积特征,明确了研究区具备深水扇形成的有利条件,受白云凹陷总体构造沉积背景影响,形成了富砂型的深水扇。本区深水扇是多种流体动力学机制共同作用的结果,碎屑流、浊流及底流相互作用与复合,形成了平面上具水道复合朵体的分布特征。在建立深水扇沉积模式的基础上,提出了水道加朵体型深水扇沉积微相划分方案,研究区储层以重力流水道、天然堤及滑塌朵体为主;而水道逐渐由相对近源的宽浅下切型变为远离物源的窄深型,其深度与天然堤宽度呈正比。%The depositional characteristics of deep-water fan reservoir are a hot topic in petroleum exploration and development.With the analysis of the depositional characteristics of deep-water fan of the Lower Miocene Zhujiang Formation in the Liwan 3-1 Area,Baiyun Sag,Pearl River Mouth Basin,some suitable conditions for the deposition of deep-water fan are discussed.Sand enriched deep-water fan controlled by the tectonic-sedimentary background were well developed in this area.The deep-water fan was the result of several kinds of hydrodynamic mechanisms which include debris flow,turbidity flow and bottom current that build gravity flow channels with complex lobes on the plane.On the basis of the deep-water fan pattern,a set of sedimentary micro-facies classification scheme of deep-water fan（mainly consists of channels and lobes） is presented.Gravity channel,natural levee and slumping lobe are the primary reservoirs in the study area.The wide-shallow incision gravity channels become narrow-deep,with the increase of the distance from sedimentary source.And the correlation of the depth of gravity channel is direct proportion to the width of natural levee.

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