Abstract
The oil fields of the Ventura Basin are very mature with many wells drilled before the advent of modern logging tools. Despite the years of development, there remain opportunities for cost-effective production, given the great thickness of the productive intervals and the dynamic-nature of the depositional and tectonic environment that created them.
Cased-reservoir analysis in existing wells is an efficient tool to target productive intervals. The well-logs and analysis examples utilize pulsed-neutron technologies. The cased-hole neutron and density porosities from the pulsed-neutron system provide the porosity information and describe gas-bearing intervals. Water flooding and gas injection has changed many of the original fluid properties. In the log analysis examples, Carbon/Oxygen logging describes the water saturations, and Sigma logging helps in the discrimination of the sands from the mudstones.
