CRS屬性參數(shù)與Fresnel帶的計(jì)算

CRS屬性參數(shù)與Fresnel帶的計(jì)算
CRS attributes and the calculation of the Fresnel zon
 
 
摘    要
 共反射面元疊加是一種不依賴于宏觀速度模型的零炮檢距剖面成像方法，共反射面元的旅行時(shí)響應(yīng)由三個(gè)波場(chǎng)屬性確定，即一個(gè)出射角а，二個(gè)曲率半徑：正入射（N）波和正入射點(diǎn)（NIP）波。這兩種特征波是在一般的共反射點(diǎn)走時(shí)關(guān)系基礎(chǔ)上引入的，在傍軸近似假設(shè)下，將CRP走時(shí)關(guān)系推廣到反射點(diǎn)臨近的各反射點(diǎn)，把這些反射點(diǎn)的CRP走時(shí)關(guān)系加以組合就得到了關(guān)于該反射點(diǎn)共反射面元的走時(shí)關(guān)系，其有兩種形式：雙曲型、拋物型。
 第一菲涅爾帶在成像中起到很重要的作用，其限定了CRS疊加的最小時(shí)窗。映射菲涅爾帶是反射面上菲涅爾帶在側(cè)線上的投影。這兩種不同意義上的菲涅爾帶都可用2－D零偏移距CRS疊加屬性來(lái)表示。
 
關(guān)鍵詞：菲涅爾帶 共反射面 屬性參數(shù) N波 NIP波 反射波走時(shí)

Abstract
 Common reflection surface(CRS)s tack is a macro-model independent seismic imaging method.To perform CRS stack depends on the determination of three wave attributes ,viz,one emergence angle and two radii of wavefront curvatures:Normal(N) wave and Nomal incidence point wave(NIP).Based on a general CRP trajectory expression ,the two kinds of eigen wave being introduced,the traveltime response of CRS can be given by extending CRP expression via considering that all rays are reflected on the segment around the reflector according to paraxial approximation.There exist two:the hyperbolic and the parabolic.
 The(first) Fresnel zone plays an important role in imaging,it is also used to define the local minimum aperture for the CRS stack.The projection of the interface Fresnel zone is up to the acquisition line.Both the reflection Fresnel zone and the Projected Fresnel zone can be expressed in terms of the 2-D zero-offset CRS stack attributes.
 
Key words:Fresnel zone,CRS,attribute,NIP wave，N wave,Travel time.

目    錄
引  言 1
第一章  橫向分辨率 2
第一節(jié) 2
第二節(jié) 2
第二章 縱向分辨率 3
第一節(jié) 3
第二節(jié) 3
參考文獻(xiàn) 4
致    謝 5
附    錄 6