摘要
为了快速且精确地计算瞬变电磁法的全区视电阻率,研究了中心回线观测方式感应电动势的特性,发现均匀半空间中心回线观测方式瞬变电磁测深法的感应电动势随电阻率的增大而单调下降的特性。据此设计出了计算全区视电阻率的一种快速且精确的算法:二分搜索算法。该算法对电阻率的可能范围不断进行二等分空间,直到找到一个电阻率,其对应感应电动势与实际观测的电动势相符。理论数据的计算表明,采用二分搜索算法计算一个测点的全区视电阻率只需要1min左右,相对误差小于0.1%,证明了该算法快速且精确。
In order to compute rapidly and accurately all-time apparent resistivity of Transient Electromagnetic Method, the characteristics of electromotive force of central loop were studied. It was a fact that the electromotive force decreased monotropically with the increasing resistivity. Based on the characteristics, a new technique such as Half Reduce Search Algorithm to compute all-time resistivity rapidly and accurately was developed. This technique searches a resistivity value whose electromotive force fits the actual value by reduction of half the possible resistivity ranged to reduce computation time. Computed results of theoretic data show that this technique is rapid and accurate, which takes only 1 minute and with less than 0.1% relative error.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2009年第2期45-49,共5页
Journal of Oil and Gas Technology
基金
国家自然科学基金项目(40874094)
关键词
瞬变电磁法
全区视电阻率
二分搜索算法
中心方式
transient electromagnetic methods
all-time apparent resistivity
algorithm
central loop
