Improving Petrophysical Interpretation of Conventional Log ‎by Determination of Real Bed Boundaries

Abstract

Proper determination of bed boundaries in layered reservoirs is vital <strong>‎</strong>for accurate petrophysical interpretation of conventional logs. In the <strong>‎</strong>wellbore, logs continuously measure physical properties of reservoir <strong>‎</strong>while the properties change stepwise. This continuous representation <strong>‎</strong>of logs may lead to ignorance of some high potential reservoir zones. <strong>‎</strong>The main reasons for continuous nature of logs in laminated reservoirs <strong>‎</strong>are the influence of shoulder beds on the reading of logging tools and <strong>‎</strong>low vertical resolution of these devices.<strong>‎</strong>In this paper we optimized a Laplacian filter to detect bed boundaries <strong>‎</strong>in conventional well logs. These blocking-based boundaries are <strong>‎</strong>validated with FMI derived bed boundaries. Then the calculated <strong>‎</strong>petrophysical properties including porosity and volume of minerals <strong>‎</strong>and fluids are distributed into the detected beds. Comparison of <strong>‎</strong>petrophysical interpretation of logs based on blocking and FMI <strong>‎</strong>derived bedding showed that the petrophysical properties realistically <strong>‎</strong>distributed into beds in layered reservoirs with the blocking technique. <strong>‎</strong>The results also showed that blocking reduces the uncertainties, <strong>‎</strong>because it realistically distribute the petrophysical properties inside real <strong>‎</strong>geological beds and alter the noises.<strong>‎</strong>