Dynamic Variations of Oil Compositions During the Course of Waterflood Development
CHANG Xiang-chun
WANG Ming-zhen
GUO Hai-hua
CHEN Qing-chun
DUAN Yun-ge
Abstract：In order to discover the variations of oil compositions with waterflood development, a case study of Linnan oil field had been conducted continuously for years. The results indicate that with the increasing of water cut from 68% to 92.4% during the course of production in Xia52 block, the relative abundance of nC_(11)- nC_(24) saturated hydrocarbons in oils were increased from 0.004 93%-0. 014 9% to 0.00 793%-0. 024 7%, the mass ratio of ∑C_(14)/∑(nC_(15)-nC_(24)), ∑(nC_9-nC_(11))/∑(nC_(17)-nC_(19)), ∑(nC_7-nC_(10))/∑(nC_(11)-nC_(22)), ∑(nC_8-nC_(12))/∑(nC_(15)-nC_(19)) and (ethylbenzene+dimethylbenzene)/(nC_(17)+nC_(18)+nC_(19)) were decreased from 0.98, 0.88, 0.267, 0.84, 0.193 to0.19, 0.09, 0.001, 0.14, 0.005, respectively. While the mass ratio of Pr/nC_(17) and Ph/nC_(18) were increased from 0.25, 0.18 to 0.37, 0.23, respectively. The concentrations of chromatography fingerprint representing iso-alkanes and cycloparaffinic hy-drocarbons were increased relatively. The fingerprint parameters demonstrated different regu-larities, including increasing, decreasing, stabilization and random with the increasing of water cut. The parameters demonstrating stable in the same horizon but different among the different horizons are available for evaluating the connectivity of oil layers, calculating production contri-bution of individual horizon to mingled oils and determining filling ratio of mixed crude oils. The parameters characterized by regional stability are fit for oil/source correlation.
Keywords：waterflood developmentoil compositiondynamic heterogeneitychromatography fingerprintwater cutgeochemistry
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 373-379 )