注水开发过程中原油的生物降解与水洗作用

doi:10.11743/ogg20170322

Abstract

Abstract: Water flooding is one of the most commonly used methods for enhancing oil recovery.About 36 oil samples from 12 waterflooded wells in Quti-9 oil reservoir of Jiyang Depression were investigated for dynamic tracking and geochemical measurements,to characterize their quality alterations and component changing patterns during the water flooding production.The results show increasing saturates and decreasing aromatics in the samples through the progress of water flooding,the typical effect of water washing during water flooding.The Pr/n-C₁₇ and Ph/n-C₁₈ ratios change in two different ways:decrease first and increase later or increase first and decrease later,indicating an effect of a strata chromatography adsorption,along with the water washing effect or biodegradation.The increasing C₁₅8β(H)-drimane/C₁₆8β(H)-homodrimane ratio can equally suggest an alteration by biodegradation or water washing.The obvious increase of tricyclic terpanes/17α(H)-hopane,C₂₇-diasterane/C₂₇-sterane,sterane/17α(H)-hopane ratios,and subtle decrease of C₃₁R/C₃₀H ratios,all indicate biodegradation.The MPI₁,and DBT/P,C₂₈TAS 20S/(20S+20R) and C₂₆-/C₂₈ TAS(20S) ratios are constant,suggesting triaromatic steroid(TAS) is unaffected by water flooding.And the phenanthrene and dibenzothiophene show no clear signs of difference in solubility or biodegradation during the waterflooding.

Key words: water flooding, water washing, biodegradation, petroleum alteration, crude oil, reservoir geochemistry, Quti oilfield, Jiyang Depression

CLC Number:

TE122.1

Chang Xiangchun, Zhao Wanchun, Xu Youde, Wang Tao, Cui Jing. Biodegradation and water washing effects on oil during water flooding[J]. Oil & Gas Geology, 2017, 38(3): 617-625.

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Biodegradation and water washing effects on oil during water flooding

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