Rock Physics of Shale - Stanford University
Rock Physics of Shale - Stanford University
Rock Physics of Shale - Stanford University
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
€<br />
Passey’s 1 Method <strong>of</strong> TOC Estimation<br />
DlogR = log 10(Rd/Rd baseline)+0.02*(dtc − dtc baseline)<br />
(2.297−0.1688LOM )<br />
TOC = DlogR*10<br />
Rd = deep resisitivity (ohm-m)<br />
Rd baseline = deep resistivity in non-source shale<br />
dtc = sonic (usec/ft)<br />
dtcbaseline = sonic in non-source rock<br />
LOM = level <strong>of</strong> maturity<br />
TOC = total organic carbon (weight fraction)<br />
Sondergeld 2 et al find that Passey sometimes underpredicts TOC in<br />
mature and overmature gas sand<br />
1. Q. R. Passey, S. Creaney, J. B. Kulla, F. J. Morettand J. D. Stroud, AAPG Bulletin, V. 74, P 1777-1794, 1990 21<br />
2. Sondergeld et al., SPE Unconventional Gas Conference, 23-25 Feb, Pittsburg Pennsylvania<br />
Gary Mavko – <strong>Stanford</strong> <strong>Rock</strong> <strong>Physics</strong> Laboratory