
第39卷第1期 2018年2月
文章编号:10013873(2018)01-0114-05
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI: 10.7657/XJPG20180116
Vol. 39.No.1 Feb.2018
核磁共振测井在低渗砾岩储集层评价中的应用
以玛湖凹陷下三叠统百口泉组为例
毛锐",许琳,房涛”,王振林”
(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; 2.中国石油集团西部钻探公司测井公司,新疆克拉玛依834000)
摘要:准葛尔金地玛潮四陷下三叠统百口泉组低渗砾着储集层岩性复杂,黏土矿物复杂,非均质性强,现有测并方法均难以精确表征岩储集层的有效孔隙度。为此,在考虑了粘土矿物含量是储集层物性控制因素的基确上,利用中子测井孔隙度和核磁共报测井孔隙度之差与岩心分析黏土矿物含量建立黏土矿物含量表征模型;再用岩心分析黏土矿物束缚水孔隙度与黏土矿物含量,建立了黏土矿物束缚水孔度表征模型,器此利用核磁共振测井孔隙度减去黏土矿物束缚水孔障度求得有效孔隙度。将该方法应用到研究区19口探并的有效孔限度计算中,相对误差仅为 6.8%,表明该方法应用效果较好,为今后利用核磁共振测井资料评价有效孔度提供了新的技术手段。
关键词:玛潮凹陷;三叠系;百口泉组;低渗砾岩储集层;核磁共振测并;黏土矿物含量;有效孔隙度中图分类号:TE112.23;P631.827
文献标识码:A
Application of NMRTechnology in Evaluation of Low-Permeability Conglomerate Reservoirs :
ACaseStudyfromtheLowerTriassicBaikouquanFormationinMahuSag
MAO Rui', XU Lin', FANG Tao', WANG Zhenlin
(1.Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;
2.Well Logging Company, Xibu Drlling Engineering Company Limited, CNPC, Karamay, Xinjiang 834000, China)
Abstract: The low-permeability conglomerate reservoir in the Lower Triassic Baikouquan formation of Mahu sag, Junggar basin is charac-terized by complex reservoir lithology, complicated clay minerals and serious heterogeneity, so it is difficult to accurately characterize the effective porosity of the conglomerate reservoir with current logging methods, Considering that the clay mineral content is the controlling factor of reservoir physiceal properties, the paper uses the diference between neutron logging porosity and NMR logging porosity and clay mineral content obtained from core analysis to establish a clay mineral content characterization model; then uses clay bound water porosity and clay mineral content obtained from core analysis to establish a clay bound water porosity characterization model, based on which the ef-fective porosity can be obtained by NMR porosity minus clay bound water porosity. The actual application of the method in 19 exploration wells in the study area shows that the relative error of effective porosity is only 6.8%, indicating that good effect has been gained by using the method, which could provide a new technological means for effective porosity evaluation with NMR logging data.
Keywords: Mahu sag; Triassic; Baikouquan formation; low-permeability conglomerate reservoir, NMR logging; clay mineral content; effec-
tiveporosity
有效孔隙度预测是低渗砾岩油藏的基础工作之二,精确表征储集层有效孔隙度,可以有效指导物性、含油气性及分类等的研究工作。目前,有效孔隙度的预测主要是利用密度、声波时差和核磁共振测井等方法。利用密度和声波时差测井确定有效孔隙度,需要先确定地层岩性、矿物类型,进而确定岩石骨架参数,具有一定的经验性"。利用核磁共振测井计算储集层有效孔隙度,就是根据储集层中黏土矿物类型,确定有效孔隙度的T起算时间,在T起算时间后的核磁共振孔隙度之和即为有效孔隙度,碎屑岩储集
收稿日期:2017-11-27
修订日期:2017-1205
基金项目:国家973项日(2014CB239006)
层的T,起算时间一般为3ms/2-3.然而,玛湖凹陷下三叠统百口泉组砾岩储集层岩性复杂,非均质性强,导致岩石骨架参数的不确定性4-6,黏土矿物类型多样、孔隙结构复杂又使得有效孔隙度不能仅依靠T起算时间进行计算,给物性测并评价带来了巨大困难。本文在分析低渗砾岩储集层物性影响因素的基础上,综合利用岩心分析总孔隙度、有效孔隙度和黏土矿物含量,利用中子测井及核磁共振测井资料对玛湖凹陷下三叠统百口泉组低渗砾岩储集层有效孔隙度进行了计算,实现了研究区探井有效孔隙度的精确表征,为
作者简介:毛锐(1989-),男,新疆克拉玛依人,T程师,测升解释,(Tel)18009906881(Email)mrui@petrochina.con.cn 万方数据