井地电阻率三维正演及Occam反演  

Research of 3D Forward Ground Resistivity and Occam Inversion

作　　者：刘琦慧 李振峰[1] 贾正森[1] 杨志宇[1] 

机构地区：[1]吉林大学仪器科学与电气工程学院,吉林长春130026

出　　处：《实验室研究与探索》2015年第2期43-45,49,共4页Research and Exploration In Laboratory

摘　　要：井地ERT方法广泛应用于采油工程,用于解决水力压裂裂缝的几何参数、注水推进方向以及波及范围的探测。采用有限差分法将连续的定解区域用有限个离散的点构成的网格代替来进行电阻率正演三维的计算,推断出地下异常体反映到地表的电位异常,并比较异常体埋深不同时的电阻率异常。建立一维层状模型,并对一维的层状模型采用Occam反演方法进行深度电阻率的反演成像,得到电阻率和深度光滑模型。Occam反演对层状模型的反演结果吻合,可以初步地对野外探测进行数据解释。Well to ERT method is widely used in production engineering. It can be used to detect the geometric parameters of hydraulic fracturing cracks, water injection development direction and the extent of the detection, In this article, continuous finite difference method is used to solve the region with a finite number of discrete points of grid for resistivity forward, instead of the calculation of three-dimensional. The method can deduce the underground abnormal body reflected in the surface potential abnormalities, and compare the abnormal body buried depth with different resistivity. One-dimensional layered model is established, and one-dimensional Occam inversion method is used for depth inversion of resistivity imaging, resistivity and smooth model of depth. The Occam inversion meets with layered model inversion results, and can explain the preliminary data of field detection.

关 键 词：有限差分法 电阻率正演 OCCAM反演 电阻率成像 

分 类 号：P319.1[天文地球—固体地球物理学]