济阳坳陷中生代原型盆地的初步恢复及其主控因素

PRELIMNARY RESTORE OF THE MESOZOIC ORIGINAL BASIN AND ITS MAIN CONTROL FACTORS IN JIYANG SAG

通过对济阳坳陷4 000 m深度水平切片并结合对中生代J-K西洼组地层残留等厚图的分析,初步恢复了济阳坳陷中生代原型盆地;中生代原型盆地存在3种盆地原型,即北西向盆地(主要分布在坳陷的东部)、北东向盆地(主要分布在坳陷的西部)和近东西向盆地(主要分布在坳陷的中央)。通过进一步对4 000 m深度水平切片和深层立体构造格架图中(断层与凸起的展布方向)的构造特征分析后指出,济阳坳陷中生代原型盆地的主控因素是北东向或北北东向和北西向构造(包括断层与凸起),认为这种认识对济阳坳陷深层下一步油气勘探,尤其是在圈定油气勘探有利目标时具有非常重要的指导意义。

Based on the analysis of the 4000m deep horizontal slice and the Mesozoic （J-K）Xiwa formation residual isopach map of Jiyang sag, the Mesozoic original basin was preliminarily restored in the paper. The results show that the original basin exists three types, that is, the first one is the northwestern type, which is located at the east of the sag ; the second one is the northeastern type, which is located at the west of the sag; and the third one is the nearly east-west type, which is located at the center of the sag. Through the further analysis of the slice and its tectonic stereo-gram （including the distribution of the fault and symon fault）, the main controlling factors of the Msozoic basin is northeastern andnorthwestern structures （including faults and symon fsult）. It is very significant of these points in the paper for the guide of trapping advantageous objects in the next oil-gas exploitation of Jiyang sag.