东海陆架盆地瓯江凹陷古近系沉积演化
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摘要
根据钻井岩心、测井、地震和古生物等资料,对瓯江凹陷古近系地层的沉积相类型和沉积演化特征进行了系统分析。结果表明,瓯江凹陷古近系发育三角洲相、扇三角洲相、湖泊相、滨海相和浅海相5种沉积相类型。根据该区构造演化特征和沉积充填特征,可将瓯江凹陷古近系沉积演化分为3个阶段:早古新世断层开始活动,形成了凹陷雏形,总体发育三角洲—湖泊—扇三角洲沉积体系;中—晚古新世断裂活动由鼎盛逐渐向衰弱转化,凹陷发育三角洲—滨海—浅海—扇三角洲沉积体系,至晚古新世末期闽浙隆起区物源的三角洲沉积体系发育规模进一步扩大;始新世凹陷处于东海盆地坳陷环境中,发育三角洲—滨海—浅海沉积体系。
Data from cores,well logs,paleontology and seismic survey have been comprehensively studied in this paper to reveal the evolutionary history of the Oujiang Sag in the Paleogene.Sedimentary facies,such as deltaic,fan deltaic,lacustrine,coastal and shallow marine facies were recognized.The tectonic evolution and filling history of this region in the Paleogene can be divided into three stages.In the early Paleocene,the prototype of the sag was formed by faulting and filled with deltaic-lacustrine-fan deltaic depositional systems.During the stage from the middle to late Paleocene,with the gradually weakening of the faulting activity,deltaic-coastal-shallow marine-fan deltaic depositional systems were developed.By the end of the late Paleocene,deltaic deposition prevailed due to the expansion of the Fujian uplift.In the Eocene,deltaic-coastal-shallow marine depositional systems were well developed owing to the depression of the sag.
Data from cores,well logs,paleontology and seismic survey have been comprehensively studied in this paper to reveal the evolutionary history of the Oujiang Sag in the Paleogene.Sedimentary facies,such as deltaic,fan deltaic,lacustrine,coastal and shallow marine facies were recognized.The tectonic evolution and filling history of this region in the Paleogene can be divided into three stages.In the early Paleocene,the prototype of the sag was formed by faulting and filled with deltaic-lacustrine-fan deltaic depositional systems.During the stage from the middle to late Paleocene,with the gradually weakening of the faulting activity,deltaic-coastal-shallow marine-fan deltaic depositional systems were developed.By the end of the late Paleocene,deltaic deposition prevailed due to the expansion of the Fujian uplift.In the Eocene,deltaic-coastal-shallow marine depositional systems were well developed owing to the depression of the sag.
引文
①中国科学院南京地质古生物研究所研究报告,2008.
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[1]刘景彦,陈志勇,林畅松,等.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):381-387.
[2]夏斌,张敏强,万志峰,等.东海丽水—椒江凹陷构造样式与含油气远景[J].华南地震,2007,27(3):1-7.
[3]蔡周荣,夏斌,孙向阳,等.丽水—椒江凹陷断裂构造特征与成盆机制的关系[J].海洋地质动态,2007,23(10):1-5.
[4]王毅.丽水、椒江凹陷伸展运动与油气形成的关系[J].石油与天然气地质,1999,20(4):316-320.
[5]王毅,姜亮,杨伟利.丽水—椒江凹陷断裂构造运动学[J].地质科学,2000,35(4):441-448.
[6]武法东,张艳梅,周平,等.东海陆架盆地第三系沉积—构造动力背景分析[J].现代地质,1999,13(2):157-161.
[7]杨华,窦伟坦,刘显阳,等.鄂尔多斯盆地三叠系延长组长7沉积相分析[J].沉积学报,2010,28(2):254-263.
[8]贾成业,夏斌,王核,等.东海陆架盆地丽水凹陷构造演化及油气地质分析[J].天然气地球科学,2006,17(3):397-401.
[9]张胜利,夏斌.丽水—椒江凹陷构造演化特征与油气聚集[J].天然气地球科学,2005,16(3):324-328.
[10]薛峰.丽水—椒江凹陷下第三系断裂系统动力机制研究[J].海洋地质动态,2010,26(4):8-12.
[11]郑求根,周祖翼,蔡立国,等.东海陆架盆地中新生代构造背景及演化[J].石油与天然气地质,2005,26(2):197-201.
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