INCREASING HYDROCARBON PROSPECT ZONE USING DETERMINISTIC MODEL BASED ON LOG AND CORE DATA IN “X” FIELD
Ratnayu Sitaresmi, Naufal Fadhlurachman, Suryo Prakoso

Master’s Petroleum Engineering Department, Universitas Trisakti, Jakarta, Indonesia

Abstract

Field X was developed by drilling 3 oil wells, X-1, X-2, and X-4, where used to know the hydrocarbon prospect zone in each well. Therefore, this study is needed to analyze and identify the prospect zones that exist in each well. The aim of this study is to obtain petrophysical values to predict the interval zone for hydrocarbon prospects. The study conducted is an analysis of the results of log and core records by using deterministic methods. With this method, rock characteristics that need to be sought include shale volume, porosity, water resistivity, water saturation, and oil column thickness (Netpay). Data for each well available includes gamma-ray log, resistivity log, log density, and neutron log. This log data is available in .LAS format which will then be inputted into petrophysical software. The thickness of the layer indicated as a prospect reservoir is determined based on the gamma-ray log which will then be determined by the volume value of the shale. The determination of porosity size is done by using density log and neutron log. The available resistivity log data is used to calculate water saturation by the Archie method. Based on this method, the average value of porosity and average saturation of water in the "X" field were 16.23% and 66.22%, respectively. Then the cutoff is done with a cutoff limit of shale volume, porosity, and saturation respectively 17.5%, 8%, and 66%. From the cutoff results, the final result in the form of reservoir lumping is the average value of net pay, porosity, and water saturation respectively of 56.39 ft, 21.1%, and 38.1%.

Keywords: hydrocarbon prospect , petrophysical values, deterministic methods density log, neutron log

Topic: Material Engineering