2011 11 04
Sponsored Links
This presentation is the property of its rightful owner.
1 / 54

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


  • 64 Views
  • Uploaded on
  • Presentation posted in: General

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. 陸上震測資料處理. 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.

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


陸上震測資料處理

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)

Geophones (receivers)


(Dobrin 1988)


Seismic acquisition offshore


Reflection Seimology


(Dobrin 1988)


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)


折射靜態修正 (Refraction statics)

(Yilmaz 1987)


(Yilmaz 1987)


(Yilmaz 1987)


Generalized Reciprocal Method (GRM)(Plus-minus method)

(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


初達波摘取圖


初達波摘取圖


Floating Datum


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)


(Yilmaz 1987)


Corrections that solely depend on source or receiver locations at the surface , not on raypaths in the subsurface.


Travel time picking method

(Yilmaz 1987)


(Yilmaz 1987)


(Yilmaz 1987)


Maximum stack power method


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


(Yilmaz 1987)


(Yilmaz 1987)


(Yilmaz 1987)


(Yilmaz 1987)


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)


受波器群組(Digital Group Forming)應用描線間距37.5m

單受波器震測記錄受波器間距6.25m


SHOT RECORD #41 (5M /chan)


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.


謝 謝敬 請 指 教


  • Login