VẬT lý địa CHẤN gravnotes

VẬT lý   địa CHẤN 07 field

VẬT lý địa CHẤN 07 field

... measurement where both shooting directions were needed to estimate the velocity of the lower layer Common field layouts +●●●●●●●●● split spread ●●●●●● ●●●●●● single ended (inline offset) + ●●●●●●●●● fan ... ●●●●●● + ●●●●●● + ●●● ●●● ●●● single ended (end on) (Top view) roll along more Geophones in the Field than active channels +●●●●●●●●● ●●●●●●●●● active not-active ● + ●●●● ●●●● ● ●●● ●●...
VẬT lý   địa CHẤN 05 amplitudes

VẬT lý địa CHẤN 05 amplitudes

... Seismic amplitudes Affected by • Reflection and transmission at an interface • Geometrical spreading • Absorption
VẬT lý   địa CHẤN 04 velocity

VẬT lý địa CHẤN 04 velocity

... 6.6 3.6 Kearey and Brooks, 1991 Velocities Interval -Velocity Instantaneous Velocity VI = zm − zn zm − zn = tm − tn τm dz Vinst = dt n Average -Velocity Vav = n ∑ z ∑v τ i =1 n ∑τ i =1 i i = i =1 ... 2(3k + µ) Seismic velocity Depend on • Matrix and structure of the stone • Lithology • Porosity • Porefilling interstitial fluid • Temperature • Degree of compaction • ……… Seismic Velocit...
VẬT lý   địa CHẤN 13 deco

VẬT lý địa CHẤN 13 deco

... spiking deconvolution Corrected wavefront divergence Yilmaz, 1987 Deconvolved gather: note the prominent reflections Undeconvolved gather: reverberating wavetrains Undeconvolved gathers Deconvolved ... + g f1 = y … … => Solve system of equations Wiener filter • Spiking deconvolution: desired output is a spike • Predictive deconvolution: attempts to remove the effect of multiples After trace ....
VẬT lý   địa CHẤN tham do dien

VẬT lý địa CHẤN tham do dien

... đạc địa vật lý khác (địa chấn, địa từ…) để tăng độ xác q trình chọn nghiệm thích hợp 5.2 Bài tốn thuận nghịch thăm dò điện đơn vò diện tích ρ1,h1 ρ2,h2 ρn-1,hn-1 ρn,hn Phân lớp ngang • Các tham ... 5 Phương Pháp Đo Sâu Điện : • Đo sâu điện phương pháp địa vật lý phát triển hồn chỉnh chiếm giữ vị trí vững phương pháp thăm dò địa vật lý • điện trở suất biểu kiến mơi tr...
VẬT lý   địa CHẤN seismic reflection

VẬT lý địa CHẤN seismic reflection

... their seismic velocities From Kearey, Brooks, and Hill, 2002 • Velocities •Many different ways of measuring velocity: •Refraction •Velocity analysis (conventional, PSDM) •Boreholes •Vertical Seismic ... From Kearey et al., 2002 •Absorption produces a progressive lengthening of the seismic pulse Attenuation A 10 Hz seismic wave travelling at km s-1 propagates for 1000 m through a medi...
VẬT lý   địa CHẤN paleomagnetism

VẬT lý địa CHẤN paleomagnetism

... interval (95% probability of containing the true direction) From Mussett and Khan, 2000 Paleomagnetism Paleomagnetism •If the apparent pole is not at the north geographic pole, the rock must
VẬT lý   địa CHẤN magnetic

VẬT lý địa CHẤN magnetic

... the magnetic permeability From Mussett and Khan, 2000 •The density of the magnetic flux, measured over an area perpendicular to the direction of flow, is known as the magnetic induction, or magnetic ... field Magnetic susceptibility is weak and negative •Paramagnetic materials: Electron shells are incomplete, creating a magnetic field from the spin of the unpaired electrons When p...
VẬT lý   địa CHẤN intruduction geophysics

VẬT lý địa CHẤN intruduction geophysics

... What is Geophysics? ? Goals • To make you aware and capable of implementing/discussing as many geophysical ... Flow – Down-hole logging – Vertical seismic profiles (VSP) – Geophysical analysis of rock samples Geophysics at the Coarsest Scale • What techniques we have to look at a region at the coarsest scale? ... 1994 • Sandwell, D.T., Gille, S.T., and W.H.F Smith, eds., Bathymetry from Sp...
VẬT lý   địa CHẤN grativity tt

VẬT lý địa CHẤN grativity tt

... been excluded from the Bouguer correction It exerts an upward attraction at the observation point causing gravity to decrease Its attraction thus must be added Gravity Reduction Terrain Correction ... Anomalies The gravitational attraction in the direction of the mass is given by: ∆g r = Gm r2 Since a gravity meter only measures the vertical component of the attraction Δgz, the gravity anoma...
VẬT lý   địa CHẤN class3 earthquakes

VẬT lý địa CHẤN class3 earthquakes

... of compressional and dilational earthquakes Plot the pole (P) to that plane, and then find another plane that also splits two area of compressional and dilational earthquakes, but also passes through ... meter) Many –ve magnitude earthquakes have been recorded at the HUGO seismic station half way between Hawai’i and the mainland •The scale was originally designed for shallow earthquakes...
VẬT lý   địa CHẤN a2 01 FUNDAMENTALS f SEISMIC EXPLORATION

VẬT lý địa CHẤN a2 01 FUNDAMENTALS f SEISMIC EXPLORATION

... Schedule  Introduction  Fundamentals of Seismic Wave Seismic Wave Propagation  P wave and Shear wave  Reflection Coefficient  Outline of Seismic Data Processing  Topics of Seismic Data Processing ... Schedule  Introduction  Fundamentals of Seismic Wave Seismic Wave Propagation  P wave and Shear wave  Reflection Coefficient  Outline of Seismic Data Processing  Top...

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