东海陆架盆地第三系层序地层格架与海平面变化
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摘要
依据地震反射特征和层序界面性质特征，对东海陆架盆地第三系进行了层序地层划分，并建立了层序地层格架．共划分出３个构造层序，７个超层序和１９个层序．以岩心成因相的精细描述及测井相分析为基础，对该盆地第三系进行了沉积体系分析．共识别出９种沉积体系，２０种沉积组合和若干种成因相．对盆地构造演化各阶段的沉积体系发育、空间展布及体系域组合等沉积响应进行了分析．以微体古生物年代化石为主要依据，结合沉积环境和沉积构造反映的古水深标志，编制了东海陆架盆地第三系海平面变化曲线．反映长周期的海平面变化有４次，短周期的海平面变化共２２次．相对海平面变化的幅度在０～１５０ｍ之间．海平面长周期反映的海侵、海退作用速度具有不对称性．以上述研究为基础，总结了盆地有利的油气生成和储集相带类型．
Based on the characteristics of seismic reflection and sequence boundaries, the sequence stratigraphic framework is set up and 3 tectonic sequences, 7 super-sequences and 19 sequences are divided for the Tertiary in the East China Sea shelf basin. 9 depositional systems, 20 depositional assemblages and a lot of genetic facies are recognized and investigated in the basin on basis of the detailed analysis of genetic facies and log facies. Also analyzed are the depositional responses including spatial distribution, development of depositional systems and system assemblages. The Tertiary sea level change curve in the basin is set up according to micropaleotologic zonation of fossils and the water-depth markers indicated by sedimentary environments and structures. There are 4 cycles showing the long-term sea level changes, and 22 subcycles showing short-term ones with relatively ranging from 0m to 150m. Transgression and regression showing the long-term sea level changes have unsymmetric feature. Finally, upon the studies mentioned above, the favorable hydrocarbon source and reservoir facies of petroleum are indicated.
Based on the characteristics of seismic reflection and sequence boundaries, the sequence stratigraphic framework is set up and 3 tectonic sequences, 7 super-sequences and 19 sequences are divided for the Tertiary in the East China Sea shelf basin. 9 depositional systems, 20 depositional assemblages and a lot of genetic facies are recognized and investigated in the basin on basis of the detailed analysis of genetic facies and log facies. Also analyzed are the depositional responses including spatial distribution, development of depositional systems and system assemblages. The Tertiary sea level change curve in the basin is set up according to micropaleotologic zonation of fossils and the water-depth markers indicated by sedimentary environments and structures. There are 4 cycles showing the long-term sea level changes, and 22 subcycles showing short-term ones with relatively ranging from 0m to 150m. Transgression and regression showing the long-term sea level changes have unsymmetric feature. Finally, upon the studies mentioned above, the favorable hydrocarbon source and reservoir facies of petroleum are indicated.
引文
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