珠江口盆地番禺低隆起韩江组高精度层序格架和沉积样式与岩性地层圈闭的发育分布
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摘要
番禺低隆起是珠江口盆地重要的含油气区。区内的韩江组可划分为3个三级层序,其顶底界面均以削蚀和上超不整合及其对应的整合为界;依据四级旋回的海泛面可进一步划分出11个四级层序或体系域。三级层序SQhj1上部的2个四级层序发育两套具有前积结构的三角洲沉积,SQhj2的低位域广泛发育下切谷充填和低水位楔。结合钻井约束的地震沉积学和古地貌学分析,揭示了四级层序沉积相的平面分布和演化。高位域三角洲前缘砂坝和水下水道、低位下切水道及低位楔三角洲、海滩砂坝砂体等为区内主要的储集砂体,它们与其上覆的海进泥岩形成良好的储盖组合,沿上超斜坡带、下斜坡或坡折带可形成岩性地层圈闭。
Panyu uplift is an important oil and gas-bearing district of the Pearl River Mouth Basin.Hanjiang Formation in the area can be divided into three third-order sequences,which are bonded by unconformities characterized by truncation or onlap contacts and its relevant conformity surfaces.Based on the flooding surfaces of the forth-order cycles,they can be subdivided into eleven forth-order sequences or systems tracts.The upper two forth-order sequences of the SQhj1 sequence consist of two sets of deltaic deposits showing progradational foresets.The lowstand systems tracts of the SQhj2 mainly include incised valley fills and lowstand wedges.Seismic sedimentology and paleo-geomorphology analysis,based on the 3D seismic data and combined with logging-restricted data,has revealed the facies distribution and revolution of important forth-order sequences in the area.The deltaic mouth bar and underwater distributary channel sandstones of the highstand systems tracts,incised channel and lowstand wedge deltaic sandy bodies and shoreline or beach sandbars comprise the major reservoirs in the study area.They are capped by overlying transgressive mudstones,so favorable reservoir and seal assemblages are formed.The economically important litho-stratigraphic traps could be formed around the onlap slope belts and the low slope or slope-break zones.
Panyu uplift is an important oil and gas-bearing district of the Pearl River Mouth Basin.Hanjiang Formation in the area can be divided into three third-order sequences,which are bonded by unconformities characterized by truncation or onlap contacts and its relevant conformity surfaces.Based on the flooding surfaces of the forth-order cycles,they can be subdivided into eleven forth-order sequences or systems tracts.The upper two forth-order sequences of the SQhj1 sequence consist of two sets of deltaic deposits showing progradational foresets.The lowstand systems tracts of the SQhj2 mainly include incised valley fills and lowstand wedges.Seismic sedimentology and paleo-geomorphology analysis,based on the 3D seismic data and combined with logging-restricted data,has revealed the facies distribution and revolution of important forth-order sequences in the area.The deltaic mouth bar and underwater distributary channel sandstones of the highstand systems tracts,incised channel and lowstand wedge deltaic sandy bodies and shoreline or beach sandbars comprise the major reservoirs in the study area.They are capped by overlying transgressive mudstones,so favorable reservoir and seal assemblages are formed.The economically important litho-stratigraphic traps could be formed around the onlap slope belts and the low slope or slope-break zones.
引文
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[2]林畅松,张燕海,刘景彦,等.高精度层序地层学和储层预测[J].地学前缘,2000,7(3):111-117.
[3]蔡希源,李思田.陆相盆地高精度层序地层学———隐蔽油气藏勘探基础、方法与实践[M].北京:地质出版社,2003.
[4]陈长民.珠江口盆地东部石油地质及油气藏形成条件初探[J].中国海上油气(地质),2000,14(2):73-83.
[5]朱俊章,施和生,庞雄,等.珠江口盆地番禺低隆起天然气成因和气源分析[J].天然气地球科学,2005,16(4):456-459.
[6]龚再生,李思田,谢泰俊,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997.
[7]米立军,张功成,傅宁,等.珠江口盆地白云凹陷北坡—番禺低隆起油气来源及成藏分析[J].中国海上油气,2006,18(3):161-168.
[8]朱筱敏.层序地层学[M].东营:石油大学出版社,2000.
[9]Lin Changsong,Zhang Yanmei,Li Sitian,et al.Quantitativelymodeling of multiple stretching of lithosphere and deep thermalhistory of some tertiary rift basins in east China[J].Acta Geo-logica Sinica,2002,76(3):324-330.
[10]林畅松,潘元林,肖建新,等.构造坡折带——断陷盆地层序分析和油气预测的重要的概念[J].地球科学,2000,25(3):260-266.
[11]林畅松,郑和荣,任建业,等.渤海湾盆地东营、沾化凹陷早第三纪同沉积断裂作用对沉积充填的控制[J].中国科学:D辑,2003,33(11):1025-1036.
[12]张英志,林畅松,马利民,等.大庆油田葡一油层组高精度层序格架内储集砂体的沉积构成及其对油田开发的意义[J].现代地质,2006,20(2):225-231.
[13]居春荣.地震属性技术在岩性油藏滚动开发中的应用——以江苏墩塘地区为例[J].现代地质,2004,18(2):244-248.
[14]刘震,梁全胜,肖伟,等.内蒙古二连盆地岩性圈闭早期形成和多期形成特征分析[J].现代地质,2005,19(3):403-408.
[15]娄占伟,潘良云,张宏伟,等.甘肃酒泉盆地营尔凹陷层序地层特征与岩性勘探目标[J].现代地质,2005,19(4):563-569.
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