冀中坳陷古近纪地层厚度变化及断层活动特征

Paleogene formation thickness changes and fault activities of Jizhong Depression

李梦萍¹ 戴俊生¹ 邹娟²

中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 中国石油冀东油田勘探开发研究院，河北 唐山 063004

以地震、地质资料为基础，以冀中坳陷的廊固、霸县及饶阳凹陷为研究工区，利用地层厚度变化率导数法和断层落差面密度法，分别研究工区古近纪地层厚度变化特征及断层活动性，进而反映构造活动强弱。结果表明：冀中坳陷古近纪断层活动性整体较强，地层厚度变化快。其中：孔店—沙四期地层厚度变化较慢，断层活动性较弱；沙三—沙二期地层厚度变化加快，断层活动性增强；沙一—东营期地层厚度变化明显减慢，断层活动整体减弱，局部断层持续活动。冀中坳陷古近纪构造活动强度经历了较弱—强—弱的变化过程。

Based on the seismic data and geological information, the main research areas are Langgu Sag, Baxian Sag and Raoyang Sag. The derivative of stratigraphic thickness changing rate and the throw-surface density are used for the formation thickness changes and faults activities, which reflect the tectonic activities. Results show that Paleogene fault activities of Jizhong Depression are intensive as a whole with the rapid formation thickness changes. The thickness changes of Ek￣Es4 formation were slow and fault activities were weak. While in the period of Shahejie 3-2, the formation thickness changed greatly with increasingly intensive ｔｅｃｔｏｎｉｃ activities. Then as the thickness changes of Es1-Ed formation decreased, the tectonic activities became weak, only partial areas continued actively. The Jizhong Depression in Paleogene underwent a weak-strong-weak tectonic evolution.

10.6056/dkyqt201602001