砾岩油藏聚合物驱储集层多参数精细评价及应用——以克拉玛依油田七东_1区克拉玛依组下亚组砾岩油藏为例  

Fine Multiparameter Evaluation for Polymer Flooding in Conglomerate Reservoirs and Its Application: A Case Study from Lower Karamay Formation in District Qidong-1, Karamay Oilfield

作　　者：徐后伟[1] 王海明[1] 刘荣军[1] 许长福[1] 王晓光[1] 吕建荣[1] XU Houwei;WANG Haiming;LIU Rongjun;XU Changfu;WANG Xiaoguang;LYV Jianrong(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2018年第2期169-175,共7页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05010-005)

摘　　要：砾岩油藏不同渗透率储集层注入聚合物分子量优选及储集层多参数精细评价,成为聚合物驱亟待解决的关键问题。以七东1区克拉玛依组下亚组砾岩油藏为研究对象,采用物理模拟的方法,明确了采收率与聚合物分子量的关系,当聚合物分子量增加到1 500×104以后,采收率增幅逐渐变小。在此基础上,以补偿密度和中子孔隙度测井曲线的径向幅度差为回归参数,建立泥质含量的计算模型,采用孔隙度与泥质含量双因素建立的渗透率模型,可以更加准确地评价砾岩储集层的渗流性。基于物理模拟实验与储集层多参数解释结果,确定了七东1区克拉玛依组下亚组砾岩油藏不同地质分区的最优化注入聚合物分子量,并在生产中取得了很好的应用效果,研究区日产油量由实施前的149.2 t提升到515.8 t.The two difficulties such as injected polymer molecular weight optimization and fine multiparameter reservoir evaluation have become the key problems to be solved urgently in the process of polymer flooding.Taking the conglomerate reservoir of the lower Karamay formation in District Qidong-1 of Karamay oilfield as the study object,the paper uses physical simulation methods to identify the relation-ship between recovery factor and polymer molecular weight,that is,the recovery factor will decrease gradually after the polymer molecular weight reaches 1 500×104.Based on which,taking the radial amplitude difference between of compensated density log and neutron porosity log as a regressive parameter,a model is established to calculate shale content.The permeability model established by using porosity and shale content can evaluate the seepage property of the conglomerate reservoir more accurately.Based on the results of physical simulation experiments and reservoir multiparameter interpretation,the optimal injected polymer molecular weights in different subregions are deter-mined for the conglomerate reservoir of the lower Karamay formation in District Qidong-1,good application effects have been gained and the daily oil production has been improved from 149.2 t to 515.8 t after the implementation of polymer flooding program in the study area.

关 键 词：克拉玛依油田 砾岩油藏 聚合物驱 孔隙结构 泥质含量模型 储集层评价 

分 类 号：TE122[石油与天然气工程—油气勘探]