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# 陸 上 震 測 資 料 處 理 陳 建 文 台灣中油公司探採事業部國資處震測資料處理組 2011/11/04 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '陸 上 震 測 資 料 處 理 陳 建 文 台灣中油公司探採事業部國資處震測資料處理組 2011/11/04' - yoshi-acosta

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1.陸上震測資料特性

2.靜態修正(statics correction)

3.剩餘靜態修正(residual statics

correction)

4.地滾波(ground-roll)消除

1.陸上震測資料特性
• Onshore seismic acquisition requires an energy input from a “thumper” truck. Geophones arrayed in a line behind the truck record the returning seismic signal.

Vibrator (source)

V=940 m/sec f=11Hz λ=85m

V=470 m/sec f=10Hz λ=47m

2.靜態修正(statics correction)：修正因地表地形起伏與近地表低速層分布不 均勻所產生之時間偏移(Time shift)量；使 炸點與接受器位於同一基準面(Datum)上。
Uphole time
• Tuh : Uphole time
• TD = －(Ts+Tr) (Total static correctoin )
• Ts= (Es-Ed-Ds) / Vb (Shot statics)
• Tr = (Er-Ed-Dr)/Vb + Tuh (Reciever statics)

(Yilmaz 1987)

(Plus-minus method) (Plus term) t+= tABCD + tDEFG – tABFG = 2 * tDelay =2*ZD*cos(ic )/ VW ZD = (t+*VW ) / cos(ic ) * 1 /2 (Minus term)d t_/ d x = 1 / V b

### 3.剩 餘 靜 態 修 正(Residual statics) ：以自動計算方式修正因靜態修正誤差產生的 時間偏移量。

• Surface consistent residual statics：
• 1.Travel time picking method
• 2.Maximum stack power method
• B.Non-surface consistent residual statics :
• cdp statics (trim statics)
Corrections that solely depend on source or receiver locations at the surface , not on raypaths in the subsurface.
CMP Gathers with field statics applied

1. Velocity analysis

Apply Residual statics

NMO-Correction

Compute Residual statics

2. Velocity analysis

NMO-Correction with new Velocities

Stacking

Residual statics
4.地滾波(Ground roll)消除方法：
• Coherence noise
• 野外震源及接受器排列設計
• 資料處理方法(f-k filter 等)

Signal velocity

region

V1

VL

f2

noise velocity

region

1.0

rejection due to pattern

n * L L

L  (n-1) / n * s

V2

k

0

fL

pattern rejection band

k

New Geophysical Applications SUPPRES – Band Limited Noise Suppression

SUPPRES performs noise suppression for band-limited noise types.

Example of ground-roll suppression using SUPPRES.