Module 5 Flashcards
What are the 3 stages of Oil and Gas Exploration?
Reconnaissance
Exploration
Data Analysis
What steps are in “Reconnaissance” ?
Planning
Designing
Acquisition
What steps are in “Exploration” ?
Processing
Interpretation
Drilling
What steps are in Data Analysis ?
Analysis of Production Data
What are the 3 science discipline ?
Geology
Geophysics
Physics
What is Legacy Data ?
old data
eg SegY from the 1980s
What is seismic inversion?
Geophysics (Seismic) to Petrophysics (Lithologic”
Pre-stack inversion (CDP Gather)
Post-stack inversion (no off information)
What is AVO?
Amplitude Varying with Offset
P waves
particle motion is parallel to the direction of wave propogation
S waves
particle motion is perpendicular to the direction of wave propagation
Sh waves
particle motion is parallel to the earth’s surface.
Hooke’s Law
Up to an elastic limit, a material will stretch elastically and proportionally in response to tensile force.
Yield Point
Point up to which a material will return to its original size upon removal of the force.
Stress
Force per unit area SIGMA=F/A
Strain
Ratio of elongation of a material to its original length
Epsilon = ( Delta L / L)
Stretch (or Young’s) Modulus
Stress / Strain
aka
(F/A) / (DELTA L/L)
Compressibility (or Buik or Volume) Modulus
(F/A) / (DELTA V/V)
Shear (or rigid) modulus)
note there is an angle involved
MU= Sigma / Epsilon
(F/A) / phi
aka TAU/Phi
Elastic Theory
Vs
Vs= (Mu/Rho) 1/2
Vs= Shear Modulus / Rho
aka Shear Modulus/Density
Elastic Theory
Vp
((K+(4/30mu)/Rho) 1/2
K= bulk density
mu = shear modulus
rho= density
Ascoustic impedence
AI = Rho V
Reflection Coefficient
Rc= (PsV2-P1V1) / (P2V2+P1V1)
Transmission coefficient
Tc=1- |R|
NMO Equation
T2=T02 + (x2/v2) it angle=o
else
T2=T02 + x2 Cos2 angle / V2)
