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
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摘要
在前人研究的基础上,以层序地层学基本原理为指导,根据地震、测井和古生物资料,对珠江口盆地番禺低隆起—白云凹陷北坡及其周围地区早中新世—中中新世地层进行了系统的层序地层分析,认为区内层序地层发育受控于特殊的古地理位置——陆架坡折。由于陆架坡折带位置从21Ma以来基本处在白云凹陷北坡附近,使得该区长期处于陆架坡折以下的斜坡深水环境,在低海平面时期发育了大量低水位体系域沉积体。以SQ21.0层序陆架坡折带为重点,通过多种研究手段,确定出陆架坡折带的分布范围,并识别出陆架坡折带控制的低位体系域主要沉积体,主要有陆架边缘三角洲(或低位楔、低位三角洲)、水道充填和低位扇等3种类型,并对其特征及展布进行了初步研究,提出了2个极具潜力的勘探领域——隐形构造圈闭和岩性圈闭。
On a basis of previous studies and sequence stratigraphy principles,a systematic analysis of sequence stratigraphy was conducted for the early-middle Miocene sediments in Panyu low-uplift,the north slope of Baiyun sag and their surrounding areas according to seismic,log and paleontology data,and it was suggested that the development of sedimentary sequences here was controlled by a speical palaeotopographic feature—the shelf break.Because the shelf break has largely been located near the north slope of Baiyun sag since 21.0 Ma,this studied region was in a deep-water environment beneath the shelf break for a long time,and a lot of sedimentary bodies of lowstand system tracts developed during lower sea level.By focussing on the shelf break zone in SQ21.0 sequence and using multiple tools,the shelf break extension is determined,and the major sedimentary bodies of lowstand system tracts controlled by the shelf break are recognized,mainly including three types such as shelf-margin delta(or lowstand wedge,lowstand delta),incised channel deposits and lowstand fan.Their characteristics and extension are preliminarily studied,suggesting two types of prospects with high exploration potential,i.e.subtle structural trap and lithological trap.
On a basis of previous studies and sequence stratigraphy principles,a systematic analysis of sequence stratigraphy was conducted for the early-middle Miocene sediments in Panyu low-uplift,the north slope of Baiyun sag and their surrounding areas according to seismic,log and paleontology data,and it was suggested that the development of sedimentary sequences here was controlled by a speical palaeotopographic feature—the shelf break.Because the shelf break has largely been located near the north slope of Baiyun sag since 21.0 Ma,this studied region was in a deep-water environment beneath the shelf break for a long time,and a lot of sedimentary bodies of lowstand system tracts developed during lower sea level.By focussing on the shelf break zone in SQ21.0 sequence and using multiple tools,the shelf break extension is determined,and the major sedimentary bodies of lowstand system tracts controlled by the shelf break are recognized,mainly including three types such as shelf-margin delta(or lowstand wedge,lowstand delta),incised channel deposits and lowstand fan.Their characteristics and extension are preliminarily studied,suggesting two types of prospects with high exploration potential,i.e.subtle structural trap and lithological trap.
引文
[1]庞雄,陈长民,彭大钧,等.南海珠江深水扇系统及油气[M].北京:科学出版社,2007:1-4.
[2]MIDDLETON G V,BOUMA A H.Turbidites and deep-watersedimentation[C]//In Proceedings of Society of Economic Pa-leontologists and Mineralogists Pacific Section Short Course.Anaheim,California,1973:157.
[3]PETTINGILL H S,WEIMER P.World wide deep water ex-ploration and production:past,present and future[J].TheLeading Edge,2002,21(4):371-376.
[4]彭大钧,庞雄,陈长民,等.从浅水陆架走向深水陆坡:南海深水扇系统的研究[J].沉积学报,2005,23(1):1-11.
[5]许仕策,陈长民.对应用地震地层和层序地层分析方法之回顾[C]//南海珠江口盆地第三纪古生物及古海洋研究.武汉:中国地质大学出版社,1996:1-9.
[6]许仕策.预测勘探目标中的层序地层学理论与实践:以珠江口盆地为例[J].中国海上油气(地质),1999,13(3):152-158.
[7]秦国权.微体古生物在珠江口盆地新生代晚期层序地层学研究中的运用[J].海洋地质与第四纪地质,1996,16(4):1-18.
[8]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[J].中国海上油气(地质),2002,16(1):1-10.
[9]庞雄,陈长民,施和生,等.相对海平面变化与南海珠江深水扇系统的响应[J].地学前缘,2005,12(3):167-177.
[10]庞雄,申俊,袁立忠,等.南海珠江深水扇系统及其油气勘探前景[J].石油学报,2006,27(3):11-16.
[11]庞雄,陈长民,朱明,等.南海北部陆坡白云深水区油气成藏条件探讨[J].中国海上油气,2006,18(4):1-5.
[12]庞雄,彭大钧,朱明,等.南海珠江深水扇系统的层序地层学研究[J].地学前缘,2007,14(1):220-229.
[13]庞雄,陈长民,彭大钧,等.南海珠江深水扇系统及油气[M].北京:科学出版社,2007:144-150.
[14]杨少坤,黄丽芬,李希宗,等.珠江口盆地特殊层序地层模式及其对勘探的指导意义[J].中国海上油气(地质),1996,10(3):137-143.
[15]施和生,李文湘,邹晓萍,等.层序地层学在珠江口盆地(东部)油田开发中的应用[J].中国海上油气(地质),2000,14(1):15-20.
[16]陈长民,施和生,许仕策,等.珠江口盆地(东部)第三系油气藏形成条件[M].北京:科学出版社,2003:122-146.
[17]董伟,林畅松,秦成岗,等.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[J].现代地质,2008,22(5):794-802.
[18]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[J].地球学报,2009,30(2):256-262.
[19]谢钦春,叶银灿,陆炳文.东海陆架坡折地形和沉积作用过程[J].海洋学报,1984,6(1):61-71.
[20]MECKEL L D.Shelf margin deltas:the key to big reserves[C].Houston:23rdAnnual GCSSEPM Foundation Bob F.Per-kins Research conference,2003:167-204.
[2]MIDDLETON G V,BOUMA A H.Turbidites and deep-watersedimentation[C]//In Proceedings of Society of Economic Pa-leontologists and Mineralogists Pacific Section Short Course.Anaheim,California,1973:157.
[3]PETTINGILL H S,WEIMER P.World wide deep water ex-ploration and production:past,present and future[J].TheLeading Edge,2002,21(4):371-376.
[4]彭大钧,庞雄,陈长民,等.从浅水陆架走向深水陆坡:南海深水扇系统的研究[J].沉积学报,2005,23(1):1-11.
[5]许仕策,陈长民.对应用地震地层和层序地层分析方法之回顾[C]//南海珠江口盆地第三纪古生物及古海洋研究.武汉:中国地质大学出版社,1996:1-9.
[6]许仕策.预测勘探目标中的层序地层学理论与实践:以珠江口盆地为例[J].中国海上油气(地质),1999,13(3):152-158.
[7]秦国权.微体古生物在珠江口盆地新生代晚期层序地层学研究中的运用[J].海洋地质与第四纪地质,1996,16(4):1-18.
[8]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[J].中国海上油气(地质),2002,16(1):1-10.
[9]庞雄,陈长民,施和生,等.相对海平面变化与南海珠江深水扇系统的响应[J].地学前缘,2005,12(3):167-177.
[10]庞雄,申俊,袁立忠,等.南海珠江深水扇系统及其油气勘探前景[J].石油学报,2006,27(3):11-16.
[11]庞雄,陈长民,朱明,等.南海北部陆坡白云深水区油气成藏条件探讨[J].中国海上油气,2006,18(4):1-5.
[12]庞雄,彭大钧,朱明,等.南海珠江深水扇系统的层序地层学研究[J].地学前缘,2007,14(1):220-229.
[13]庞雄,陈长民,彭大钧,等.南海珠江深水扇系统及油气[M].北京:科学出版社,2007:144-150.
[14]杨少坤,黄丽芬,李希宗,等.珠江口盆地特殊层序地层模式及其对勘探的指导意义[J].中国海上油气(地质),1996,10(3):137-143.
[15]施和生,李文湘,邹晓萍,等.层序地层学在珠江口盆地(东部)油田开发中的应用[J].中国海上油气(地质),2000,14(1):15-20.
[16]陈长民,施和生,许仕策,等.珠江口盆地(东部)第三系油气藏形成条件[M].北京:科学出版社,2003:122-146.
[17]董伟,林畅松,秦成岗,等.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[J].现代地质,2008,22(5):794-802.
[18]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[J].地球学报,2009,30(2):256-262.
[19]谢钦春,叶银灿,陆炳文.东海陆架坡折地形和沉积作用过程[J].海洋学报,1984,6(1):61-71.
[20]MECKEL L D.Shelf margin deltas:the key to big reserves[C].Houston:23rdAnnual GCSSEPM Foundation Bob F.Per-kins Research conference,2003:167-204.
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