番禺低隆起三级层序的界面识别标志及沉积特征
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摘要
番禺低隆起地区是珠江口盆地最有利的油气勘探区域之一,目前已经在该区发现了多个气田和含气构造,天然气地质储量达1200亿m~3,成藏条件非常有利。随着勘探的不断深入,目前面临着可供钻探的构造目标越来越少的难题。本文通过对珠江口盆地番禺低隆起三维地震资料解释,结合钻井、古生物、测井等资料,开展层序划分对比工作,建立区域层序地层格架,揭示了研究区三级层序界面的识别标志及等时地层结构的基本特征,并对层序格架内沉积相的构成、分布特征及演化、有利储盖组合特征进行了研究,对今后该区的油气勘探具有指导意义。
The Panyu low uplift is one of the most favorable oil and gas accumulation zones in the Pearl River Mouth Basin.Multiple gas fields and gas-bearing structures have been found in this area.The OGIP is estimated as about 120 billion cubic meters.How to find new oil and gas exploration areas on the basis of exploratory results is important for the sustainable development of the natural gas exploration in the Pearl River Mouth Basin.In this paper,the sequence stratigraphic framework of this area is built and the sequence structure characteristics,the depositional evolution and its control factors are analyzed based on the previous studies,the seismic data,the well log curves and the paleontology.The sequence boundary identification and the structure characteristics of the sequence stratigraphy are presented,together with the distribution and the development of sedimentary facies in the sequence stratigraphic framework of this area.It turns out that there are several different sedimentary sequence development models in the evolution stage of the Pearl River Mouth Basin.The sequence structure characteristics and the distribution of the sedimentary systems are mainly controlled by the sea level variation and the faulted slope-break zone,as a result,there are five reservoir-seal assemblages formed in this area,among which two have a good exploration potential.
The Panyu low uplift is one of the most favorable oil and gas accumulation zones in the Pearl River Mouth Basin.Multiple gas fields and gas-bearing structures have been found in this area.The OGIP is estimated as about 120 billion cubic meters.How to find new oil and gas exploration areas on the basis of exploratory results is important for the sustainable development of the natural gas exploration in the Pearl River Mouth Basin.In this paper,the sequence stratigraphic framework of this area is built and the sequence structure characteristics,the depositional evolution and its control factors are analyzed based on the previous studies,the seismic data,the well log curves and the paleontology.The sequence boundary identification and the structure characteristics of the sequence stratigraphy are presented,together with the distribution and the development of sedimentary facies in the sequence stratigraphic framework of this area.It turns out that there are several different sedimentary sequence development models in the evolution stage of the Pearl River Mouth Basin.The sequence structure characteristics and the distribution of the sedimentary systems are mainly controlled by the sea level variation and the faulted slope-break zone,as a result,there are five reservoir-seal assemblages formed in this area,among which two have a good exploration potential.
引文
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[3]林畅松,刘景彦,刘丽军,等.高频层序地层分析:建立沉积相和储层规模的等时地层格架[J].现代地质,2002,16(3):276-281.Lin Changsong,Liu Jingyan,Liu Lijun,et al.Geoscience,2002,16(3):276-281.
[4]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,2003:1-20.Chen Changmin,Shi Hesheng,Xu Shice,et al.The oil and gas reservoir formation conditions in the Pearl River Mouth Basin(eastern)of tertiary[M].Beijing:Science Press,2003:1-20.
[5]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:中国地质大学学报,2000,25(3):260-266.Lin Changsong,Pan Yuanlin,Xiao Jianxin,et al.Earth Science:Journal of China University of Geosciences,2000,25(3):260-266.
[6]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.Pang Xiong,Chen Changmin,Shi Hesheng,et al.Earth Science Frontiers,2005,12(3):167-177.
[7]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.Pang Xiong,Peng Dajun,Zhu Ming,et al.Earth Science Frontiers,2007,14(1):220-229.
[8]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.Pang Xiong,Chen Changmin,Peng Dajun,et al.The Pearl River deep-water fan system&petroleum in South China Sea[M].Beijing:Science Press,2007:144-150.
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