注水开发过程中原油组成的动态变化特征  

Dynamic Variations of Oil Compositions During the Course of Waterflood Development

作　　者：常象春[1] 王明镇[1] 郭海花[1] 陈庆春[2] 段云歌[1] 

机构地区：[1]山东科技大学地质科学与工程学院,山东青岛266510 [2]中国石化胜利油田临盘采油厂,山东临邑251507

出　　处：《中国矿业大学学报》2009年第3期373-379,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(40502013)

摘　　要：为了揭示原油组成在注水开发过程中的变化规律，以临南油田为例，对注水开发过程中原油组成进行连续多年的动态监测．结果表明，随着开发过程中夏52块含水率由68％升高到92．4％，原油饱和烃中nC11～nG24组分浓度由0．00493％～0．0149％升高到0．00793％～0．0247％，饱和烃轻／重比∑C14^-／∑（C15～C24），∑（C9～C11）／∑（C17～C19），∑（C7-C10）／∑（C11～C22），∑（C8～C12）／∑（C15～C19）分别由0．98，0．88，0．267，0．84减小到0．19，0．09，0．001，0．14，（B1＋B2＋B3）／∑（nC17～nC19）由0．193降低至0．005，Pr／nC17与Ph／nC18分别由0．25，0．18增加到0．37，0．23，反映异构烷烃和环烷烃的色谱指纹化合物的浓度相对升高，而色谱指纹参数表现出升高、降低或稳定不变等规律性变化．在同一层内相对稳定、但在不同层间存在差异的参数可用于评价油层连通性、计算合采井单层产能贡献和混合油单层充注比率；具有区域稳定性的参数可用于油源对比研究．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 nC11- nC24 saturated hydrocarbons in oils were increased from 0. 004 93%-0. 014 9% to 0. 00 793%-0. 024 7%, the mass ratio of ∑C14-/∑（nC15- nC24）, ∑（nC9 - nC11 ）/∑（nC17 -nC19）, ∑（nC7- nC10 ）/∑（nC11- nC22）, ∑（nC8 - nC12 ）/∑（nC15 - nC19） and （ethylbenzene＋ dimethylbenzene）/（nC17 ＋ nC18 ＋ nC19 ） were decreased from 0.98, 0.88, 0. 267, 0.84, 0. 193 to 0.19, 0.09, 0. 001, 0.14, 0. 005, respectively. While the mass ratio of Pr/nC17 and Ph/nC18 were increased from 0.25, 0.18 to 0.37, 0, 23, respectively. The concentrations of chromatography fingerprint representing iso-alkanes and cycloparaffinic hydrocarbons 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 contribution 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.

关 键 词：注水开发 原油组成 动态非均质性 色谱指纹 含水率 地球化学 

分 类 号：TE122.1[石油与天然气工程—油气勘探]