方正断陷中部发育走滑断层的地震证据及有利区带预测

Seismic Evidence of Strike-Slip Faults in the Middle of Fangzheng Rift and Favorable Exploration Areas

方正断陷是依舒地堑中北部的一级负向构造单元。为了确定盆地的形成机制,明晰其中断层体系的性质,利用新三维地震资料对方正断陷进行了详细的构造解析。剖面上'花状构造'、平面上断层雁行式展布与空间上'海豚效应'等6方面地震地质证据证明方正断陷中部发育走滑断层系。走滑断层发育证明方正断陷在新生代以来发生过右行平移运动。方正断陷是在走滑构造背景下形成的与走滑相关的断陷盆地。综合走滑断层的石油地质特征研究预测,区内德善屯凹陷的中心及坡折处具有很好的油气勘探潜力。

Fangzheng rift is a negative tectonic units in the north-central part of Yi - Shu rift. In order to understand the formation mechanism of the basin and the nature of fault system, the new 3D seismic data is used to interpret the structure. The study found that six seismic and geological evidences, for instance, the ＂flower structure＂ and ＂dolphin effect＂, can prove that strike-slip fault developed. Fangzheng rift is a strike-slip fault related basin. The strike-slip fault＇ s petroleum geological characteristics indicate that the slope-break zone of Deshantun depression is a favorable exploration area.