冀中坳陷霸县凹陷新近纪构造活动及其对油气成藏的控制

Tectonic activity of Baxian Sag in Jizhong Depression in Neogene and its control to hydrocarbon accumulation

选取断层密度、断层落差面密度、地层厚度变化率导数及底面曲率4个评价指标对霸县凹陷在新近纪的构造活动强度进行定量表征,依据构造活动强度将霸县凹陷新近纪划分为强构造区、强弱过渡区及弱构造区:霸县凹陷北部南孟地区及西南部高家堡地区构造活动较强烈,为强构造区;凹陷东部苏桥、文安地区构造活动性次之,被划分为强弱过渡区;凹陷其他地区构造活动微弱,为弱构造区。分析构造活动强弱对油气成藏的控制,发现霸县凹陷强构造区最利于油气成藏,其次是强弱过渡构造区,亦具备油气聚集条件。霸县凹陷西南部高家堡地区、北部南孟地区及东部苏桥、文安地区油气藏富集,为霸县凹陷有利勘探区带。

The tectonic activity intensity of Baxian Sag in Neogene is quantitatively characterized by four parameters: fault density,fault throw surface density,stratigraphic thickness varying rate derivative and bottom surface curvature. Neogene in Baxian Sag is divided into strong tectonic zone,weak tectonic zone and transition zone based on the intensity of tectonic activity. Nanmeng area in the north of Baxian Sag and Gaojiabao area in the southwest of it had intense activity,which are classified to strong tectonic zones; Suqiao and Wen'an areas in the east of the sag belong to transition zones and other areas in the sag are classified to weak tectonic zones. Through studying the control of tectonic activity to the oil reservoir,it is found that the strong tectonic zones are the most favorable to hydrocarbon accumulation,and the transition zones have also hydrocarbon accumulation conditions. So Gaojiabao area,Nanmeng area,Suqiao and Wen'an areas are the favorable zones to oil and gas exploration in Baxian Sag.