陆架坡折带识别及其对沉积层序的控制作用
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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.
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.
引文
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[3]徐强,王英民,王丹等.南海白云凹陷深水区渐新世—中新世断阶陆架坡折沉积过程响应.沉积学报,2010,28(5):906～915Xu Qiang,Wang Yingmin,Wang Dan et al.Sedimenta-ry responses of retreating shelf break from Oligoceneto Miocene,in deep water area of Baiyun Depression,South China Sea.Acta Sedimentologica Sinica,2010,28(5):906～915
[4]施和生,秦成岗,高鹏等.珠江口盆地番禺低隆起—白云凹陷北坡天然气晚期成藏特征.中国海上油气,2008,20(2):73～76Shi Hesheng,Qin Chenggang,Gao Peng et al.Late gasaccumulation characteristics in Panyu low-uplift andthe north slope of Baiyun sag,Pearl River Mouth ba-sin.China Offshore Oil and Gas,2008,20(2):73～76
[5]董伟,林畅松,谢利华等.珠江口盆地番禺隆起东南缘断裂坡折带及其对低位域构造—岩性油气藏的控制作用.地球学报,2009,30(2):256～262Dong Wei,Lin Changsong,Xie Lihua et al.Faultslope-break zone and its control over structural lithos-tratigraphic traps of lowstand system tracts in South-east Panyu Uplift of the Pearl River Mouth Basin.Ac-ta Geoscientica Sinica,2009,30(2):256～262
[6]施和生,秦成岗,张忠涛等.珠江口盆地白云凹陷北坡—番禺低隆起油气复合输导体系探讨.中国海上油气,2009,21(6):361～366Shi Hesheng,Qin Chenggang,Zhang Zhongtao et al.Adiscussion on the complex hydrocarbon transport sys-tem in the north slope of Baiyun sag-Panyu low uplift,Pearl River Mouth basin.China Offshore Oil andGas,2009,21(6):361～366
[7]林畅松,潘元林,肖建新等.构造坡折带断陷湖盆层序和油气预测的重要概念.地球科学——中国地质大学学报,2000,25(3):260～267Lin Changsong,Pan Yuanlin,Xiao Jianxin et al.Struc-tural slope-break zone:key concept for stratigraphic se-quence analysis and petroleum forecasting in fault sub-sidence basins.Earth Science:Journal of China Uni-versity of Geosciences,2000,25(3):260～267
[8]秦成岗,施和生,张忠涛等.珠江口盆地番禺低隆起—白云凹陷北坡SQ21.0层序陆架坡折带沉积特征及油气勘探潜力.中国海上油气,2011,23(1):14～18Qing Chenggang,Shi Hesheng,Zhang Zhongtao et al.Sedimentary characteristics and hydrocarbon explora-tion potential along the SQ21.0sequence shelf-breakzone on Panyu low-uplift and the north slope of Baiyunsag,Pearl River Mouth basin.China Offshore Oil andGas,2011,23(1):14～18
[9]秦国权.珠江口盆地新生代晚期层序地层划分和海平面变化.中国海上油气(地质),2002,16(1):1～10Qin Guoquan.Late Cenozoic sequence stratigraphy andsea level changes in Pearl River Mouth Basin,SouthChina Sea.China Offshore Oil and Gas,2002,16(1):1～10
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