变偏移距VSP资料处理方法研究

RESEARCH ON METHOD OF DISPOSING DATA OF VARIABLE OFFSET VSP

变偏移距VSP这门勘探技术自从提出来已经有20多年的历史了,但是,变偏移距VSP的应用还是止步不前,主要原因在于变偏移距VSP方法与常规VSP方法相比有波场复杂、波场分离困难的缺陷。然而,由于该方法检波器可以固定在储集层的上方,有利于描述储层性质及其纵横向变化情况,当有油气显示时,用变偏移距VSP探测漏掉的油气层是很有效的。在理论分析的基础上,编写程序实现了抛物拉冬变换的正、反变换,利用此程序成功实现了复杂条件下变偏移距VSP资料的上、下行波和转换波的分离,效果明显,并且具有实用性。

The exploration technology of variable offset VSP has put forth for 20 years,but its application seldom goes forward again,mainly due to there exist some defects in wave field complexity and wave field separation with variable offset VSP comparing with normal VSP.However,the detector of variable offset VSP can be fixed on the reservoir layer,which contributes to describe the nature of storage layer and the changes on vertical and horizontal direction when the oil gas shows.It is very effective that omitted gas in gas-oil layer can be explored with the method of variable offset VSP.Based on the theoretical analysis,the programming is obviously effective and practical,which finishes the transform of parabolic radon in pros and cons as well as achieves the separation under the complex conditions between the up and down traveling wave in variable offset VSP data and the converted wave.