鄂尔多斯盆地上三叠统延长组层序界面成因类型及控制因素分析
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摘要
利用野外露头和岩心,结合测井曲线、地震资料,应用层序地层学理论,结合层序界面的成因与盆地的演化,对鄂尔多斯盆地上三叠统延长组层序界面进行分析,识别出区域不整合面、沉积环境转换面、河道冲刷面、地层结构转换面以及岩性颜色变化面和湖泛面6种成因界面类型。在详细讨论各类型界面特征的基础上,对研究区的层序界面的控制因素进行了分析,认为层序界面的形成和发育受3个因素控制,即构造沉降、湖平面变化、古气候。
According to the theory and approach of sequence stratigraphy, the observations and descriptions of the main field outcrops and cores of the Upper Triassic Yanchang Formation in Ordos basin, in combination with abundant well logging curves, and seismic data, It was found out that there were six genetic types of sequence boundaries in the Upper Triassic Yanchang Formation in Ordos Basin, including region unconformity surface, transition surface of sedimentary environment, erosion surface, transition surface of sequence structure, transition surface of lithology and color, and flooding surface. On the basis of different types of characteristic sequence boundaries in Ordos Basin,the control factors of sequence boundary are studied, it is revealed that the sequence boundary is controlled by tectonic subsidence, lacustrine level change, and paleoclimatic.
According to the theory and approach of sequence stratigraphy, the observations and descriptions of the main field outcrops and cores of the Upper Triassic Yanchang Formation in Ordos basin, in combination with abundant well logging curves, and seismic data, It was found out that there were six genetic types of sequence boundaries in the Upper Triassic Yanchang Formation in Ordos Basin, including region unconformity surface, transition surface of sedimentary environment, erosion surface, transition surface of sequence structure, transition surface of lithology and color, and flooding surface. On the basis of different types of characteristic sequence boundaries in Ordos Basin,the control factors of sequence boundary are studied, it is revealed that the sequence boundary is controlled by tectonic subsidence, lacustrine level change, and paleoclimatic.
引文
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[9]李德生.重新认识鄂尔多斯盆地油气地质学[J].石油勘探与开发,2004,31(6):1~7.
[10]刘池洋.叠合盆地特征及油气赋存条件[J].石油学报,2007,28(1):1~7.
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