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...

Ngày tải lên: 08/12/2016, 20:27

... Exploration Geophysics Mamdouh R Gadallah · Ray Fisher Exploration Geophysics 123 Mamdouh R Gadallah 1120 Nantucket Drive Houston, ... nature Exploration Geophysics by Gadallah and Fisher is a timely product which will fill a much needed gap The authors endeavor to present a simplified version of the science of exploration geophysics ... “Addendum to Glossary of Terms used in Ge...

Ngày tải lên: 08/12/2016, 20:30

... 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 ● + ●●●● ●●●● ● ●●● ●●...

Ngày tải lên: 08/12/2016, 20:27

... Seismic amplitudes Affected by • Reflection and transmission at an interface • Geometrical spreading • Absorption

Ngày tải lên: 08/12/2016, 20:27

... 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...

Ngày tải lên: 08/12/2016, 20:27

Ngày tải lên: 08/12/2016, 20:27

... 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 ....

Ngày tải lên: 08/12/2016, 20:27

... 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...

Ngày tải lên: 08/12/2016, 20:27

... 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...

Ngày tải lên: 08/12/2016, 20:27

... 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

Ngày tải lên: 08/12/2016, 20:27

... 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...

Ngày tải lên: 08/12/2016, 20:27

... 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...

Ngày tải lên: 08/12/2016, 20:28

Ngày tải lên: 08/12/2016, 20:28

... 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...

Ngày tải lên: 08/12/2016, 20:28

... 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...

Ngày tải lên: 08/12/2016, 20:29