东海陆架盆地瓯江凹陷古近系层序地层学与沉积特征研究
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摘要
应用层序地层学方法,通过钻井、测井、地震反射等标志,识别出层序界面和最大海泛面,将东海陆架盆地瓯江凹陷古近系划分为3个层序,层序界面分别为T20、T40、T42、T50,并以地层叠置样式、岩性、岩相的变化为依据在单井上将每个三级层序细分为低位、湖侵和高位3个体系域;在层序格架内利用钻井和古生物资料分析了沉积体系在瓯江凹陷的平面展布:月桂峰组主要是三角洲相和湖泊相沉积,灵峰组和明月峰组是三角洲相和滨海相沉积,瓯江组和温州组为三角洲相和滨海相沉积,其中瓯江凹陷东次凹为浅海相沉积;沉积物源主要以西向东注入和西北方向向东南注入,同时揭示了古近系两次大规模海侵分别是古新世中期灵峰组沉积时期和始新世中期瓯江组沉积时期。
The strata of Oujiang Sag are divided into three sequences by identifying the sequence surfaces and the most flooding faces based on drilling data,logging data and seismic data.The sequence faces are recognized in the seismic section,they are T20,T40,T42,T50.Each sequence is divided into three tracts based on the changes of lithology facies,overlying model and so on.Due to the research on the drilling cores,the logging data and paleontologic evidence,we define some depositional systems such as delta,lacustrine and marine in the Paleogene System of Oujiang Sag.Yueguifeng group consistss of delta facies and lacustrine facies sediments,Lingfeng group and Mingyuefeng group consists of delta facies and littoral facies sediments,Oujiang group and Wenzhou group consists of delta facies and littoral facies sediments,and neritic facies deposited in the east sag.Sediments sourced from west and northwest.In the Paleogene System,two large marine transgressions happed in middle Paleocene and middle Eocene.
The strata of Oujiang Sag are divided into three sequences by identifying the sequence surfaces and the most flooding faces based on drilling data,logging data and seismic data.The sequence faces are recognized in the seismic section,they are T20,T40,T42,T50.Each sequence is divided into three tracts based on the changes of lithology facies,overlying model and so on.Due to the research on the drilling cores,the logging data and paleontologic evidence,we define some depositional systems such as delta,lacustrine and marine in the Paleogene System of Oujiang Sag.Yueguifeng group consistss of delta facies and lacustrine facies sediments,Lingfeng group and Mingyuefeng group consists of delta facies and littoral facies sediments,Oujiang group and Wenzhou group consists of delta facies and littoral facies sediments,and neritic facies deposited in the east sag.Sediments sourced from west and northwest.In the Paleogene System,two large marine transgressions happed in middle Paleocene and middle Eocene.
引文
[1]杨玉卿,田洪.丽水凹陷晚古新世海平面变化及有利储层分布预测[J].中国海上油气(地质),2003,17(1):69-73.
[2]姜亮.东海陆架盆地油气资源勘探现状及含油气远景[J].中国海上油气(地质),2003 17(1):1-5.
[3]刘景彦,陈志勇,林畅松.东海丽水西次凹古新统明月峰组层序—体系域分析及沉积体系展布[J].沉积学报,2004,22(3):380-385.
[4]姜在兴,操应长.砂体层序地层及沉积学研究——以山东惠民凹陷为例[M].北京:地质出版社,2000:17-21.
[5]姜亮,李保华,钟石兰.东海陆架盆地台北坳陷月桂峰组生物地层及古环境[J].海洋地质与第四纪地质2004,24(1):37-39.
[2]姜亮.东海陆架盆地油气资源勘探现状及含油气远景[J].中国海上油气(地质),2003 17(1):1-5.
[3]刘景彦,陈志勇,林畅松.东海丽水西次凹古新统明月峰组层序—体系域分析及沉积体系展布[J].沉积学报,2004,22(3):380-385.
[4]姜在兴,操应长.砂体层序地层及沉积学研究——以山东惠民凹陷为例[M].北京:地质出版社,2000:17-21.
[5]姜亮,李保华,钟石兰.东海陆架盆地台北坳陷月桂峰组生物地层及古环境[J].海洋地质与第四纪地质2004,24(1):37-39.
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