珠江口盆地深水区白云凹陷始新统—下渐新统沉积特征
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摘要
以珠江口盆地白云凹陷钻井和地震资料为基础,根据地震相、地震速度岩性指数、沉积古地形特征和区域地质背景等资料综合分析了白云凹陷古近系主要层序各体系域的沉积相发育特征。研究结果表明,白云凹陷古近系文昌层序与恩平层序是属于两个不同演化阶段的层序。文昌层序是断陷期沉积,低位体系域发育滨浅湖相沉积,湖扩体系域发育中深湖相沉积,高位体系域沉积期有北部、西南部和东南部3个物源体系,发育(扇)三角洲-滨浅湖-中深湖沉积体系。恩平层序属于断陷向坳陷转换期的沉积,低位体系域在构造高部位发育河道充填沉积,在凹陷内发育滨浅湖相沉积;湖扩体系域发育中深湖相沉积;高位体系域沉积期有北部和南部2个物源体系,发育(扇)三角洲-滨浅湖-中深湖沉积体系。
The characteristics of the Paleogene sedimentary phase in each system tract in the main sequence of Baiyun Sag were analyzed on the basis of drilling and seismic data,and the seismic phase,seismic velocity,lithology,sedimentary characteristics of paleotography and geography setting of the local area.The research results show that Wenchang sequence and Enping sequence are different in evolution stages.Wenchang sequence was deposited in the faulting period.The shore-shallow lake sedimentary facies developed in the low system tract(LST),and the semi-deep lake sedimentary facies developed in lacustrine-expanding system tract(EST).There were three source systems in the north,southwest and southeast parts,and the fan delta-shallow coastal lake-semi-deep lake sedimentary systems developed in the high system tract(HST).Enping sequence was deposited in the period of transformation from faulting to depression.The channel-filling sediment developed in the high parts of structure in LST,and the shallow coastal lake sediment developed in middle sag of LST.The semi-deep lake sedimentary facies developed in EST.There were two source systems in the north and south parts of HST and also developed(fan) delta-shallow coastal lake-semi-deep lake sedimentary systems.
The characteristics of the Paleogene sedimentary phase in each system tract in the main sequence of Baiyun Sag were analyzed on the basis of drilling and seismic data,and the seismic phase,seismic velocity,lithology,sedimentary characteristics of paleotography and geography setting of the local area.The research results show that Wenchang sequence and Enping sequence are different in evolution stages.Wenchang sequence was deposited in the faulting period.The shore-shallow lake sedimentary facies developed in the low system tract(LST),and the semi-deep lake sedimentary facies developed in lacustrine-expanding system tract(EST).There were three source systems in the north,southwest and southeast parts,and the fan delta-shallow coastal lake-semi-deep lake sedimentary systems developed in the high system tract(HST).Enping sequence was deposited in the period of transformation from faulting to depression.The channel-filling sediment developed in the high parts of structure in LST,and the shallow coastal lake sediment developed in middle sag of LST.The semi-deep lake sedimentary facies developed in EST.There were two source systems in the north and south parts of HST and also developed(fan) delta-shallow coastal lake-semi-deep lake sedimentary systems.
引文
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[3]刘震,吴因业.层序地层框架与油气勘探[M].北京:石油工业出版社,1999:20-23.Liu Zhen,Wu Yinye.Sequence stratigraphic frame and oil explo-ration[M].Beijing:Petroleum Industry Press,1999:20-23.
[4]王龙樟.基准面变化与层序地层——以塔里木盆地陆相地层为例[J].岩相古地理,1998,18(3):4-5.Wang Longzhang.Base-level changes and nonmarine sequencestratigraphy:An example from the Tarim Basin,Xinjiang[J].Sedimentary Facies and Paleogeography,1998,18(3):4-5.
[5]陆基孟.地震勘探原理[M].东营:石油大学出版社,2001:206-210.Lu Jimeng.Principles of seismic exploration[M].Dongying:Press of the University of Petroleum,China,2001:206-210.
[6]刘震.储层地震地层学[M].北京:地质出版社,1997:83-104.Liu Zhen.Seismic stratigraphy of reservoir[M].Beijing:Geolog-ical Publishing House,1997:83-104.
[7]祝伟业,侯建国,高永富.速度量化在岩性预测中的应用[J].新疆石油地质,2001,22(2):122-123.Zhu Weiye,Hou Jianguo,Gao Yongfu.Application of velocityquantification in lithologic prediction[J].Xinjiang Petroleum Ge-ology,2001,22(2):122-123.
[8]李正文,杨谦.地震岩性预测方法及应用[J].矿物岩石,1996,17(1):81-84.Li Zhengwen,Yang Qian.An approach to seismic lithologicalprediction and its application[J].Journal of Mineralogy and Pe-trology,1996,17(1):81-84.
[9]张功成,米立军,吴时国,等.深水区—南海北部大陆边缘盆地油气勘探新领域[J].石油学报,2007,28(2):15-21.Zhang Gongcheng,Mi Lijun,Wu Shiguo,et al.Deepwater area—the new prospecting targets of northern continental margin ofSouth China Sea[J].Acta Petrolei Sinica,2007,28(2):15-21.
[10]代一丁,庞雄.珠江口盆地珠二坳陷石油地质特征[J].中国海上油气(地质),1999,13(3):169-180.Dai Yiding,Pang Xiong.Petroleum geological characteristics ofZhuⅡDepression,Pearl River Mouth Basin[J]China OffshoreOil and Gas(Geology),1999,13(3):169-180.
[11]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):11-15.Pang Xiong,Shen Jun,Yuan Lizhong,et al.Petroleum prospectin deep-water fan system of the Pearl River in the South ChinaSea[J].Acta Petrolei Sinica,2006,27(3):11-15.
[12]彭大钧,陈长民,庞雄,等.南海珠江口盆地深水扇系统的发现[J].石油学报,2004,25(5):17-23.Peng Dajun,Chen Changmin,Pang Xiong,et al.Discovery ofdeep-water fan system in South China Sea[J].Acta Petrolei Sin-ica,2004,25(5):17-23.
①杨甲明.中国近海油气资源评价报告.中国海洋石油总公司,1993.
②刘铁树,何仕斌.南海北部陆缘深水区油气基本地质条件分析.中海石油勘探开发研究中心,1999.
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