南海北部陆坡白云深水区深水沉积结构要素  

Deepwater Depositional Elements in Baiyun Deepwater Area of the Northern Continental Slope,South China Sea

作　　者：刘军[1] 庞雄[1] 颜承志[1] 柳保军[1] 胡琏[1] 李元平[1] 韩晋阳[1] 

机构地区：[1]中国海洋石油有限公司深圳分公司研究院,广州510240

出　　处：《吉林大学学报（地球科学版）》2011年第4期992-998,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家重大科技专项(2008ZX05025;2008ZX05056)

摘　　要：在回顾深水沉积结构要素研究的基础上,结合白云深水区的勘探实践,对白云深水区深水沉积的结构要素进行了研究。将白云深水区深水沉积划分为4种结构要素,分别为水道、天然堤-溢岸沉积、席状砂和块体搬运沉积。水道是白云深水区深水沉积的主要组成部分,也是重要的储层;水道按成因可分为侵蚀型、侵蚀/加积型和加积型;水道充填沉积物的岩性变化较大,有砾岩、砂岩、泥岩以及几种岩性的混合。天然堤-溢岸沉积主要以泥岩、粉砂岩为主,平面上,天然堤-溢岸沉积与水道走向平行,横向上远离水道扩散,侧向连续性好但垂向连续性差。席状砂位于水道末端,具有朵叶状外形,分为层状和合并状2种类型:层状席状砂具有相对低的砂岩体积分数,泥岩和砂岩互层;而合并状席状砂岩体积分数高,砂层和砂层接触,夹有少量的泥。块体搬运沉积包括滑塌、滑块、块体流、碎屑流、坡身失稳复合体、块体搬运复合体等;块体搬运沉积常直接位于层序界面上,对下伏地层侵蚀明显,分布广泛,可作为良好的油气封盖层。Based on the review of deepwater depositional elements＇ research in the world,combined with the exploration practice of Baiyun deepwater area,the deepwater depositional elements in Baiyun deepwater area are studied.The deepwater depositional elements include channel,levee-overbank,sheet sand and mass-transport deposit.The channel is one of the main components of deepwater deposits and the important reservoir in Baiyun deepwater area.The channel fills have been classified into three broad categories： erosional,erosional/aggradational and aggradational channel genetically.The nature of channel-fill deposits varies greatly.Deposits can include gravel,sand,mud,and mixed fill.Levee-overbanks are dominated by muddy and silty deposits,and its trends roughly parallel to the channel,spreaded laterally away from channel,good lateral continuity and poor vertical communication.Sheet sands are deposited at the terminus of channels and are characterized by their lobate external form.Sheet sands can be divided into layered and amalgamated types.Layered sheets are characterized by relatively low net gross with interbedded shale and sandstone beds.Amalgamated sheets are characterized by high net gross,comprising stacked sandstone beds with fewer interbedded shales.Mass-transport deposit includes what is commonly termed slumps,s lides,mass flows,debris flows,slope failure complexes and mass-transport complexes,etc.It can erode the underlying strata and widely distributed,and it can also serve as a good seal for oil and gas.

关 键 词：白云深水区 深水沉积 结构要素 水道 天然堤-溢岸沉积 南海 储层 

分 类 号：P618.13[天文地球—矿床学]