Geochemical Surveillance of the Linnan Oil Field with Oil Fingerprinting

Abstract

Linnan oil field is one of the main producing areas of Shengli Oil Company and fronted with the challenge of sustaining production. Technique of oil fingerprinting is conducted for the production surveillance of reservoir engineering issues. Geochemical analysis of oils in Linnan oil field continued for several years and indicates that with the course of waterflood development, oil fingerprints are varied regularly. Ratios of fingerprint peak weights show positive, negative or stable correlations with the increase of water cut, suggesting the relative displacement preferences of different fingerprints. The ratios stable in single-zone endmember oils and variable in multi-zone commingled oils with waterflood development can be selected for continuity appraisal and production allocation, while those varied with water cut can be used for distinguishing oil or water layers and defining the water flooded layer. Based on the contribution allocation of multi-zones production, development measurements are optimized and job executions are evaluated effectively in Linnan oil field. Connectivity of producing and injecting well characterized by oil fingerprints assists the detection of low grade fault in X53 fault block reservoirs, improving the contradiction between injection and production.