基于构造物理模拟实验的走滑量求取

Strike-slip fault displacement calculation based on structure physical simulation

利用现有钻井资料、地震解释成果,结合区域特殊断裂特征,基于辽中凹陷断裂体系的平面、剖面特征,完成了两条主走滑断裂平行侧列、两条主走滑断裂不平行侧列、单条主走滑断裂等3组断裂样式的构造物理模拟,深入研究了辽中凹陷走滑断裂典型特征、断裂演化以及形成机理,同时计算了主干断裂走滑量。模拟结果表明:①辽中凹陷在平面发育一系列雁列、帚状断裂体系,主要发育在LZ1断裂尾端以及走滑断裂上部浅层,受控于渐新世右旋走滑活动;②随着走滑量增加,先后形成雁列、帚状断裂体系、平面贯通断裂形态,雁列、帚状断裂体系可作为深层走滑断裂解释的基本依据;③走滑量定量模拟统计分析表明,伸展量与走滑量比率约为3∶2,辽东湾坳陷的3条一级断裂在东营期走滑作用最强,LZ1断裂走滑量最大。

This paper demonstrates an example of strikeslip fault displacement calculation based on structure physical simulation.Using drilling data and seismic interpretation,a structural physical simulation of Liaozhong Sag is completed based on local faults and fault system characteristics.Three groups of fault patterns are involved,i.e.,two main parallel strike-slip faults,two main non-parallel strike-slip faults,and a single main strike-slip fault.The evolution and formation mechanism of the strike-slip faults are discussed and main strikeslip fault displacement is calculated.The following understandins are obtained:(1)Several geese and broom fault systems were developed in Liaozhong at the end of the LZ1 fault and upper layers of strike-slip faults,which were mainly controlled by the Oligocene right-lateral strike-slipping;(2)Geese and broom fault systems,and plane through fractures were formed with the increase of slip,geese and broom fault systems can be used as references for deep strike-slip fault interpretation;(3)Based on quantitative statistical analysis,the ratio of extension to slip is about 3:2,the strongest strike-slipping of three main faults was in the Dongying Period,and the largest slip occurred at LZ1.