冀中坳陷廊固凹陷古近纪断层演化规律

廊固凹陷为冀中坳陷3大富油凹陷之一，系统研究其断层演化规律，对该区油气勘探具有重要意义。文中采用定性研究与定量分析相结合的方法进行研究，结果表明：大兴断层形成最早，琥珀营断层形成较晚，沙三中期形成的主要断层最多，平面上由南到北凹陷内部主要断层形成时期逐渐变晚；断层走向以北东向为主，由早期到晚期存在顺时针的旋转；同一时期内，边界大兴断层活动强，凹陷内部断层活动弱；而在不同时期，断层整体活动演化规律与构造活动强度基本一致，沙四早期—沙四中期、沙三早期—沙三晚期断层整体活动较强，其他各时期活动较弱。

 Langgu Sag is one of the three oil?鄄enriched sags in Jizhong Depression. The systematic analysis of fault evolution makes an important significance to the exploration of the oil and gas. This research applies the method of qualitative and quantitative analysis. The results show that Daxing fault forms earlier than that of other faults and Hupoying fault forms late. The main faults formed in the middle sedimentary period of Es3 are more than that of other periods. The main faults in the sag form gradually later from the south to the north; most of the faults are NE trending faults and the fault strike is clockwise rotation from the sedimentary period of Ek to Ed; Daxing fault activity is strong and the fault activity in the sag is weak in the same period; the evolutional rule of fault activity during different periods is in accordance with the intensity of structural activity and fault activity is strong in the early to middle sedimentary period of Es4 and the early to late sedimentary period of Es3 in the whole, in other periods, fault activity is weak.

10.6056/dkyqt201502002