Effect of Oil on the CNL

$2.00

Harold Sherman, John Ullo,
Schlumberger-Doll Research

SPWLA TWENTY-FOURTH ANNUAL LOGGING SYMPOSIUM, JUNE 27-30, 1983

1983

Abstract

It has been assumed that in porous rocks the CNL and similar tools respond primarily to the hydrogen density of the formation and secondarily to other nuclei present. According to this model, since the hydrogen density of water and most crude oils are close in value, the neutron tool should give nearly the same response with either oil or water in the pores of the same rock.