本文選題：粘彈介質(zhì) + 近似解析離散方法�。� 參考：《石油物探》2017年03期

【摘要】：地層的粘彈性對地震波產(chǎn)生的吸收和衰減規(guī)律非常復(fù)雜,所以研究地震波在粘彈性介質(zhì)中的傳播規(guī)律對地震勘探有著重要的意義。近似解析離散化方法是近年來出現(xiàn)的一種有限差分?jǐn)?shù)值模擬方法,籍此探討了幾種近似解析離散化方法的原理和過程。通過與一維粘彈聲波方程解析解的對比,認為改進的近似解析離散化方法(INAD)的精度、穩(wěn)定性和計算效率更具優(yōu)勢,并將其首次應(yīng)用于二維粘彈聲波方程數(shù)值模擬。通過數(shù)值模擬,重點分析了聲波振幅、頻率、頻帶寬度隨品質(zhì)因子及傳播距離的衰減規(guī)律,粘彈介質(zhì)中的地震波不僅因波前擴散導(dǎo)致振幅衰減,還因吸收作用導(dǎo)致振幅和頻率同時衰減,利用其衰減特征可以指導(dǎo)含油氣儲層的預(yù)測。
[Abstract]:The absorption and attenuation of seismic waves by viscoelastic strata are very complicated, so it is of great significance to study the propagation of seismic waves in viscoelastic media. The approximate analytic discretization method is a finite difference numerical simulation method which has appeared in recent years. The principle and process of several approximate analytic discretization methods are discussed in this paper. Compared with the analytical solution of one-dimensional viscoelastic acoustic equation, the improved approximate analytical discretization method (Inad) is considered to have more advantages in accuracy, stability and computational efficiency, and it is applied to the numerical simulation of two-dimensional viscoelastic acoustic equation for the first time. Through numerical simulation, the attenuation law of acoustic wave amplitude, frequency and band width with quality factor and propagation distance is analyzed. Seismic wave in viscoelastic medium not only attenuates amplitude due to wave front diffusion. The amplitude and frequency attenuate at the same time because of absorption, which can be used to predict the oil and gas reservoir.
【作者單位】： 油氣資源與勘探技術(shù)教育部重點實驗室(長江大學(xué));
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)(2013CB228605)和中國石油科技創(chuàng)新基金項目(2015D-5006-0301)聯(lián)合資助~~
【分類號】：P631.4
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本文編號：2093044