关键词: 松辽盆地, 宾县&mdash, 王府凹陷, 平衡剖面, 构造特征

Abstract:

By means of  two dimensional structure-stratigraphy  interpretation of several seismic profiles, cross-section balancing,
and calculation of extension amount and extension  rates,  the paper  investigated developing process of  the Binxian-Wangfu sag
and analyzed  the structural  features and forming mechanism of the basin. The results show that Binxian-Wangfu sag was in the
initial stage of rifting  in  the Huoshiling Formation, Shahezi Formation and Yingchengzi Formation, and  the  fault depression was
mainly controlled by normal faults before the deposition of the Denglouku Formation. The sag onlaps to the Tangfangzhen uplift,
and was also controlled to some extent by normal faulting within the basin during the deposition. The sag completely turned into
depression and exhibited regional subsidence after the deposition of the Denglouku Formation, and the subsidence center was not
obviously corresponding  to  the early  fault depression, and  the subsidence of  the Binxian-Wangfu sag was not controlled by  the
early fault depression. During the Quantou Formation period, especially the third segment and the Qingshankou Formation period
the sag mainly showed depressional subsidence; The general structure of  the basin was clearly marked by  faults  in  the  lower
section and onlap in the upper section. The basin formation was associated with the the NS-trending dextral transtension.

Key words:  Songliao Basin, Binxian-Wangfu sag, balanced cross section, tectonic feature