305-pp3

305-pp3 - UNIVERSITY OF SOUTH ALABAMA Last Time Refraction...

This preview shows pages 1–3. Sign up to view the full content.

1 GY 305: Geophysics GY 305: Geophysics Lecture 3: Lecture 3: Petroleum Part 1: Petroleum Part 1: Generation and Migration Generation and Migration UNIVERSITY OF SOUTH ALABAMA Last Time Last Time Refraction and Reflection Wave front mechanics Wave propagation Refraction, reflection and Snell’s Law Wave Theory When a body wave propagates a certain distance from the seismic source (say out of the damaged zone), the wavefront (the surface consisting of particles that all vibrate the same) is spherical in form. At greater distances, the spherical shape of the waveform flattens out significantly forming a plane wave . Lowrie, W., 2007. Fundamentals of Geophysics 2 nd edition, Cambridge University Pres, Cambridge, 381p Wave Theory In order to be able to interpret geophysical data, some understanding of mathematical modeling is necessary: And this is one-dimensional wave equation This is the one-dimensional equation of motion Wave Propagation Huygens’ Principle: “All points on a wavefront can be regarded as point sources for the production of new spherical waves; the new wavefront is the tangential surface (or envelop) of the secondary wavelets”. Lowrie, W., 2007. Fundamentals of Geophysics 2nd edition, Cambridge University Press, Cambridge, 381p Wave Propagation Reflection of the wave front back into the original media (shale) Lowrie, W., 2007. Fundamentals of Geophysics 2nd edition, Cambridge University Press, Cambridge, 381p

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 Wave Propagation Refraction of the wave front across the interface into the new media (sandstone) Lowrie, W., 2007. Fundamentals of Geophysics 2nd edition, Cambridge University Press, Cambridge, 381p Wave Propagation This brings us back to elementary wave theory and in particular, Snell’s Law Sheriff, R.E., 1978. A First Course in Geophysical Exploration and Interpretation. IHRDC, Houston, TX. 313p sin(i) = sin(r) V i V r Petroleum Geology Introduction Subsurface fluids (origin of petroleum) Migration of petroleum Today Today ’s Agenda s Agenda Careers in Petroleum There is no “I” in petroleum geology. Geologists work in teams, generally focusing on a particular area like the Gulf Coast. Petroleum Geology Petroleum Geology ht p:/ www.geopix.net/about-us.htm Careers in Petroleum •Exploration Geologists: study large regions that do or could contain petroleum, identifying progressively smaller areas of progressively greater interest in these until a prospect (play) worth drill has been identified and discovering oil or gas in one of more of them. Petroleum Geology Petroleum Geology Surface outcrop Geophysical surveys Borehole data htp:/www.dukeswoodoilmuseum.co.uk/pictures/borehole.jpg Careers in Petroleum •Development Geologists: starts with the discovery well and a detailed seismic survey , and locates appraisal wells to assess the size and nature of of the accumulation(s). Petroleum Geology
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 9

305-pp3 - UNIVERSITY OF SOUTH ALABAMA Last Time Refraction...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online