sİsmİk prospeksİyon ders-3 doÇ.dr. hÜseyİn tur
DESCRIPTION
SİSMİK PROSPEKSİYON DERS-3 DOÇ.DR. HÜSEYİN TUR. SİSMİK KIRILMA. Sismik Dalganın Oluşturulması Sismik Dalganın Kayıt Edilmesi Ölçme : Seyehat Zamanı Genlik. Kırılmanın Temelleri. Sismik Kaynaklar. Balyoz Tabanca Patlayıcılar. Sismik Alıcılar Jeofonlar. Sismik Alıcılar. - PowerPoint PPT PresentationTRANSCRIPT
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SİSMİK PROSPEKSİYON
DERS-3
DOÇ.DR. HÜSEYİN TUR
SİSMİK PROSPEKSİYON
DERS-3
DOÇ.DR. HÜSEYİN TUR
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SİSMİK KIRILMA
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Kırılmanın Temelleri
• Sismik Dalganın Oluşturulması• Sismik Dalganın Kayıt Edilmesi• Ölçme:
Seyehat Zamanı Genlik
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Sismik KaynaklarBalyoz Tabanca Patlayıcılar
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Sismik Alıcılar Jeofonlar
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Sismik AlıcılarJeofonlar Kablo Dijital Kayıt
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Kırılma SismiğiTek kanallı
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Kırılma sismiğiÇok Kanallı
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İki tabakalı hız modeli
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Wavefronts & Raypaths
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Body Waves
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Dalga cephesi 65msn
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Dalga cephesi 80msn
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Dalga cephesi 110msn
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Dalga cephesi 110msn
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Işın yolları ve Baş Dalgaları
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r
fi
• i=f “geliş ve yansıma açıları birbirine eşittir.”• sin i/sin r = V1/V2
V1
V2
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r
i
• Kritik Kırılma (Tam yansıma)• r = 90o
• sin ic = V1/V2
V1
V2
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Kırılma Sismiğinin Temeli
--Sismik kırılma verisi ilk varış zamanları ve bunlara karşılık gelen mesafeyi içerir.
--İlk varışlardan sonra gelen sismik olgular ihmal edilir.
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From Tom Boyd’s WWW Site - http://talus.mines.edu/fs_home/tboyd/GP311/introgp.shtml
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Basit yatay iki tabakalı model
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Direct Dalga
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Yansıyan Dalga
Model ÇalışmasıBasit yatay iki tabakalı model
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Baş dalgası veya Kritik kırılma?
Model ÇalışmasıBasit yatay iki tabakalı model
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Tüm varışlar
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Zaman
Mesafe
?
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Direkt
Zaman
Mesafe
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?
Zaman
Mesafe
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Yansıyan
Mesafe
Zaman
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?Zaman
Mesafe
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Kırılan veya baş dalgası
Mesafe
Zaman
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Direkt
Yansıyan
Kırılan veya baş dalgasıZaman
Mesafe
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?
Time
Distance
Direct
Kırılan veya baş dalgası
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Çapraz mesafe
Time
Distance
Direkt
Yansıyan
Kırılan veya baş dalgası
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Direk varışlar
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Yansıyan dalga varışları
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Kırılan dalga varışları
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Model ÇalışmasıBasit yatay iki tabakalı model
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T ve X grafiğinden
Doğrunun eğimi = 1/V2
Y ‘yi kestiği nokta(kesme zamanı)= 2z(cos ic)/V1
Verilen bir doğrunun denklemi
Y = mx + bm=eğim,
Gösterilirse,
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DerinlikDerinlik
Kesme zamanı
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Çapraz mesafe
Time
Distance
Direkt
Yansıyan
Kırılan veya baş dalgası
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Time
Distance
Direkt
Yansıyan
ti
Kırılan veya baş dalgası
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Çapraz mesafede direk dalga için T = xcross/V1
Çapraz mesafede kritik kırılma zamanıT = xcross/V2 + 2z(V2
2- V12)1/2/ V2
2 V12
Çapraz mesafe üzerinde Direk ve baş dalgası araısndaki ilişki?
Tdirekt = Tbaş
xcross/V1 = xcross/V2 + 2z(V22- V1
2)1/2/ V22 V1
2
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xcross/V1 = xcross/V2 + 2z(V22- V1
2)1/2/ V22 V1
2
Çapraz mesafeden Derinlik denklemiÇapraz mesafeden Derinlik denklemi
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3 TABAKA DURUMU3 TABAKA DURUMU
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3 TABAKA DURUMU SEYAHAT ZAMANI3 TABAKA DURUMU SEYAHAT ZAMANI
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ÇOK TABAKA DURUMUÇOK TABAKA DURUMU
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2 TABAKA DURUMU
3 TABAKA DURUMU
N. TABAKA DURUMU
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Eğimli Tabaka Durumu Düz Atış
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Eğimli Tabaka Durumu Ters Atış
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(ic = c)
Eğimli Tabaka Durumu
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td
Eğimli Tabaka Durumu
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Apparent VelocitiesHow can you determine dip direction?
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Eğim açısının 10 dereceden küçük olması durumnda görünür ve gerçek hızlar arasındaki ilişki
Eğim açısının 10 dereceden küçük olması durumnda görünür ve gerçek hızlar arasındaki ilişki
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Eğimin > 10o olması durumunda v2 nasıl hesaplanır?
(ic = c) hatırlarsak
[sin-1 (V1/Vd) + sin-1 (V1/Vu)]c =
2
V2 =V1/sin c
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Eğim ne olur?
[sin-1 (V1/Vu) – sin-1 (V1/Vd)] =
2
(ic = c) hatırlarsak,
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V2 ve Eğim> 10o?
[sin-1 (V1/Vu) – sin-1 (V1/Vd)] =
2
[sin-1 (V1/Vd) + sin-1 (V1/Vu)]c =
2
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Derinlik hesabına bakacak olursak
(ters ve düz atışlar için)
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td
Derinlik hesabına bakacak olursak
(ters ve düz atışlar için)
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Bilinenler ta, tb ,V2 , V1 , ve c profil sonundaki Z değerini hesaplayabiliriz
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Eğim aşağı seyahat zamanı eğrisi için ta kesme zamanına karşılık gelen Za derinliği;
za = taV1/(2cos c)za = taV1/(2cos c)
za ile da arasındaki ilişki ?
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za = taV1/(2cosc)
da = za cos
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Yukarı eğim durumunda profile?
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p. 289
zb = tbV1/(2cos c)
Yukarı eğim seyahat zamanı eğrisi için tb kesme zamanına karşılık gelen Zb derinliği;
zb ile db arasındaki ilişki ?
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p. 289
zb = tbV1/(2cos c)
db = zb cos
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Arazi çalışması
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Santa Teresa County Park
Refraction ProfileShot 1
Shot 2
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İlk varışlar
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Veri Tablosu
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Düz ve Ters atışlar (X-T)Santa Teresa Hills Forward Profile
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
0 30 60 90 120 150 180 210 240 270 300 330 360
Distance (feet)
Tim
e (m
illis
eco
nd
s)
Santa Teresa Hills Reverse Profile
0.05.0
10.015.0
20.025.0
30.035.0
40.045.0
50.0
0 30 60 90 120 150 180 210 240 270 300 330 360
Distance (feet)
Tim
e (m
illis
eco
nd
s)
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Aynı grafik üzerinde gösterim
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Santa Teresa Hills Experiment
T = 0.332x
R2 = 0.8731
T = 0.0705x + 18.367
R2 = 0.9849T = 0.0954x + 10.985
R2 = 0.9913
T = 0.3033x
R2 = 0.9792
0.0
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10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
0 30 60 90 120 150 180 210 240 270 300 330 360
Distance (feet)
Tra
velt
ime
(mil
lise
con
ds) Direct Wave Forw ard
Head Wave Forw ard
Direct Wave Reverse
Head Wave Reverse
Linear (Direct Wave Forw ard)
Linear (Head Wave Forw ard)
Linear (Head Wave Reverse)
Linear (Direct Wave Reverse)
Grafiğin Yorumu
Kesme Zamanı T ve çapraz mesafeler
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What does gravity surveying or “gravity”
measure?
Variation in gravitational acceleration
? ft ? ft
Shot #1 Shot #2
Ana kaya = V2 = xxxx ft/sn
Alüvyon = V1 = xxxx ft/sn
x ft
Corrected Dip =?o
Yüzey eğimi= xo
Jeolojik model hesabı
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Çok katmanlı eğimli tabaka
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Gizli Tabaka durumu
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İnce tabaka durumuİnce tabaka durumu
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İnce tabaka durumuİnce tabaka durumu
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Sınır üzerinden gelen baş dalgaları asla ilk varışlarda gözlenemez!!
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Süreksizlik durumu
• Atım miktarı• Normal Fay
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Süreksizlik durumu
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Düz ve Ters Profiller
•Açılım•Yakın atışlar •Uzak atışlar • CDP (Split Spread) atışı
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Düzensiz yüzeylerde yol – zaman grafiklerindeki bozukluklar
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Düzensiz yüzeylerde yol – zaman grafiklerindeki bozukluklar