改进的重力位场向下延拓计算方法  

CALCULATING METHOD OF THE DOWNWARD CONTINUATION FOR THE IMPROVED GRAVITY POTENTIAL FIELD

作　　者：王纯[1] 张研[1] 文百红[1] WANG Chun;ZHANG Yan;WEN Baihong(PetroChina Research Institute of Exploration ＆ Development, Beijing 100083, China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《大庆石油地质与开发》2018年第1期147-153,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项(2016ZX05006-005)

摘　　要：由于位场下延计算自身存成不适定性,研究人员一直在寻找一种稳定的位场下延计算方法。通过改进前人提出的正则化位场延拓算子,实现了利用正则化目标方程求取其中的正则化参数,同时使用黄金分割搜索方式加快了运算效率。另外,将算子的低通滤波功能改进为带通滤波方式,建立相对应的正则化目标方程,实现过滤高频段干扰的同时对低频段的信息也进行一定程度的遴选。该方法实现了针对不同下延深度求取不同的正则化滤波参数以及频带范围,实现了稳定、高效地重力位场下延计算。通过模型试算以及实测数据验证了该方法的实用性。For a long time,because of the ill-applicability nature of the potential-field downward calculation itself,the stable corresponding calculating method has been sought. With the help of the regularized field continuation operator proposed by the predecessors,the regularized target equation was adopted to obtain the regularized parameters,and meanwhile the golden-section search method was used to speed up the operation efficiency. In addition,the function of the low-pass filter of the operator was improved to be the band-pass filter,and the corresponding regularized target equation was established to filter the high-band interference and select the information of low frequency band to a certain deal at the same time. For different depths of the downward depth,with the help of this method,different regularized filtering parameters and frequency ranges were obtained and moreover the stable and high-efficiency gravity field downward calculation was realized. The applicability of the method was validated by the model trail test and actually measured data.

关 键 词：向下延拓 正则化 目标方程 带通滤波 

分 类 号：P631[天文地球—地质矿产勘探]