陆架坡折带识别及其对沉积层序的控制作用  

Shelf break zone identification and its control on sedimentary sequence formations

作　　者：冉怀江 林畅松[2] 代一丁 秦成岗 吴伟[4] 张俞[2] 乔阳[2] 

机构地区：[1]中国石油长城钻探工程公司解释研究中心,北京100101 [2]中国地质大学(北京)能源学院,北京100083 [3]中国海洋石油深圳分公司研究院,广东广州510240 [4]河南理工大学,河南焦作454150

出　　处：《石油地球物理勘探》2012年第A01期125-128,169+162,共4页Oil Geophysical Prospecting

摘　　要：基于对珠江口盆地白云凹陷北坡—番禺低隆起上的珠江组—韩江组层序地层格架划分,综合利用钻井、测井、地震资料,运用层序地层学原理,重点对韩江组中段SQhj2层序的层序、体系域特征进行了分析,得出以下认识:①SQhj2层序可划分为低位、海侵及高位体系域,其中低位体系域可进一步划分为早期低位域和晚期低位域。②通过分析时间厚度图、连井对比剖面及下切水道等特征,确定了SQhj2层序陆架坡折线位于C井区东南,呈近北东向分布,断裂陆架坡折带对SQhj2沉积层序的形成具有重要的控制作用。③SQhj2层序陆架坡折及其控制的低位域是有利砂体的分布区带,砂体向上倾方向上超于层序界面或不整合面,可与高位域的泥质层、上斜坡泥层相接,上覆为海侵期泥岩,具有较好的封盖条件,可形成上超不整合圈闭类型;坡折带下部的两期低位扇体与深海泥岩可构成最佳储盖组合,可形成良好的地层圈闭。On basis of previous studies,Zhujiang-HanJiang formtations in the shelf break zone in Panyu low-uplift and the north slope of Baiyun Sag of Pearl River Mouth Basin are considered as a sequence stratigraphic framework.Using drilling,logging and seismic data and sequence stratigraphic principle,the paper analyzes characteristics of sedimentary sequence system tract for SQhj2 of the middle segment of Hanjiang formation.The main observations are as follows:①SQhj2 can be divided into low-stand system tract,transgressive system tract and high-stand system tact.And the low-stand system tract can be recognized as two stages.②Based on incised channels on system tract,time isopaches and cross-well sections,the boundary of the shelf break zone of the SQhj2 located in the southeast of Well area C,is distributed in the near northeast direction.The fracture slope break zone is an important controlling factor of the depositional sequence formation of the SQhj2.③The shelf break zone and the low-stand system tract of the SQhj2 are well-developed favorable sand body area.Up-dip sand bodies overlay onto the sequence boundary or unconformity surface,and contact with the muddy layers of high-stand system tract and the upper slope.They are capped by overlying transgressive mudstone with a good sealing condition.So the onlap unconformity traps can be formed.Two-stage low-stand fans under the shelf break zone and the deep sea mudstone can form better reservoir-seal assemblage and favorable stratigraphic traps.

关 键 词：珠江口盆地 番禺低隆起 陆架坡折带 韩江组中段 沉积层序 地层圈闭 

分 类 号：P631[天文地球—地质矿产勘探]