摘要
珠江口盆地白云凹陷在继"白云运动"之后,在13.8 Ma发生了一次大规模的海退事件,海平面下降至陆架坡折带附近,三角洲向盆地方向推进最远,十分有利于深水扇的发育。通过深水陆坡区B6井及陆架边缘多口井的井震标定,结合钻井、测井分析,系统总结出具有厚度较大(20～40 m)、以泥质粉砂岩为主的斜坡扇储层,对应低频、短轴、强振幅的地震反射特征,在负极性显示的地震剖面上,表现为强波谷地震响应。层序地层格架分析认为工区处于SQ13.8"陆架边缘三角洲—沉积过路区—斜坡扇"的沉积环境,并在层序格架的约束下,通过合成地震记录建立井-震关系,对斜坡扇区第5套砂层组(SF-5)进行储层识别与追踪解释,确定SF-5砂层为主体分布在陆架坡折带外侧陆坡区的丘状体,平面形态似帚状或朵叶状,具有斜坡扇的特征,其优质储层主要分布在工区的中部-西部地区,呈NW-SE方向条带状展布。
After the Baiyun Movement （ 13.8 Ma）, Baiyun Sag in the Pearl River Mouth Basin happened a massive regressive event, the sea level regressed near the shelf slope-break zone and the delta propelled furthest towards the basin, which was very beneficial to the development of deep-water fan. By means of the drilling and logging analysis and the well-seismic calibration of B6 well in the deep water area of the continental slope and some wells in the shelf margin, it was concluded that reservoir of slope fan with larger thickness （20 m to 40 m） in argillaceous siltstone, corresponded to the low frequency, short axis and high amplitude in the seismic reflection, and strong wave hollow in the negative polarity display of the seismic profiles. Through the establishment of sequence stratigraphic framework, it was summarized that tile main depositional setting of the SQI3.8 was ＂shelf margin delta-bypass area-slope fan＂. On the restrainl of the stratigraphie framework, through synthetic seismic＇ records 1o establish the well-seismic relationship, we identified and interpreted SF-5 reservoir in slope fin zone, and determined the SF-5 reserwfir mainly distributed in the moundy which is in the flank of continental slope of the shelf slope break zone, its plane distribution looks like a broom and it has feature of the slope fan. The high quality reservoir of SF - 5 mainly distributed in the middle and west working areas, was banded in the north wesl-sotflh east direction.
出处
《现代地质》
CAS
CSCD
北大核心
2013年第2期366-372,共7页
Geoscience
基金
国家“十二·五”科技重大专项项目(2011ZX05025-003-006)
关键词
南海北部
白云深水区
斜坡扇
合成地震记录
层序地层格架
储层分布
northern South China Sea
Baiyun deep-water area
slope fan
synthetic seismic record
sequence stratigraphic framework
reservoir distribution
