东濮凹陷成藏动力学系统划分及其意义

根据高精度层序地层高频沉积旋回、泥岩欠压实、有机地球化学特征.结合封闭条件和盐湖盆地地层发育盖异性特征,东濮凹陷古近系—第四系地层自上而下可划分为5个成藏动力学系统,即顶部它源常压开放成藏动力学系统、上部混源常压开放成藏动力学系统、中部混合源弱超压半封闭成藏动力学系统、下部自源超压半封闭成藏动力学系统、底部自源超压封闭成藏动力学系统,其中、下部成藏动力学系统是东濮凹陷最重要的油气系统。这种成藏动力学系统划分对深化东濮凹陷油气勘探、寻找隐蔽性油气藏具有重要意义。

Classification and significance of reservoir-forming dynamics system in Dongpu sag

Based on the characteristics of high-frequency sedi- mentary cycles of high accuracy sequence stratigraphy,un- dercompaction in mudstone,characters of organic geochem- istry,and combined with confining conditions and differences between formations in the salt-lake basin,the Paleogene and Quaternary formations are classified into five kinds of reservoir-forming dynamics systems from new to old:the top part else-sourced normal pressure open dynamic sys- tem,the upper part mixed-sourced normal pressure open dynamic system,the middle part mixed-sourced poor over- pressure semi-closed dynamic system,the lower part self- sourced overpressure semi-closed dynamic system,and the bottom part self-sourced poor overpressure closed dynamic system.Of these dynamics systems,the lower and the mid- dle part dynamic systems are the most significant hydrocar- bon exploration systems.It is more important to search for subtle reservoirs and speed up the hydrocarbon exploration proceeding in Dongpu sag.