伊拉克H油田碳酸盐岩储层的孔隙结构特征及其对电阻的影响  

Pore structure characteristics of the carbonate reservoir and their influence on electric properties in H oilfield,Iraq

作　　者：姜均伟 朱宇清 徐星 赵玉宏 薛永杰 胡友良 

机构地区：[1]中国石油长城钻探工程公司,北京100101 [2]伊拉克哈法亚油田公司 [3]伊拉克绿洲油田公司

出　　处：《地球物理学进展》2015年第1期203-209,共7页Progress in Geophysics

基　　金：中国石油天然气集团公司科学研究与技术开发项目(2011D-4101)资助

摘　　要：针对伊拉克H油田碳酸盐岩储层较强的非均质性,本文利用岩心资料研究了M2组颗粒灰岩与泥粒灰岩的孔隙结构特征,并详细分析了M2组下段油层低阻的成因.根据实验得到的孔喉半径分布曲线划分的大孔、中孔和小孔的累计比例,把储层划分为大、中、小三种孔隙结构,结果表明M2组上段颗粒灰岩以大孔和中孔为主,下段泥粒灰岩以中孔和小孔为主.压汞毛管压力曲线表明下段的非均质性强于上段.找出了以中、小孔为主孔隙结构及其复杂的润湿性是造成M2组下段油层低电阻率的原因.用毛管孔径划分的三种孔隙结构刻度了核磁T2谱,结果显示毛管孔径划分的三种孔隙结构与核磁T2谱划分的三种孔隙具有很好的一致性,岩心渗透率与核磁得到的渗透率也具有很好的一致性,找到了用核磁资料准确评价储层的孔隙结构的一种有效途径.The carbonate reservoirs in H Oilfield are of complicated heterogeneity.The lithologies of the M2 Formation in H oil field are mainly composed of grainstone and packstone.On the basis of core data,this paper analyzed the pore structure characteristics and the origin of the low resistivity oil reservoir.The pore systems are classified into Macro pore,Mezzo pore and Micro pore according to the mercury injection.The results show that Marco pore and Mezo pore is predominant in limestone with a grainstone texture in the upper interval of M2 formation,and the packstone pore system mainly consists of Mezzo pore and Micro pore.The capillary pressure curves show the heterogeneity is heavier than that in the down interval.The analysis results showed that the electric properties are affected by the distribution of Mezo pore and water-filled Micro pore of the reservoir.In this paper,the Nuclear Magnetic Resonance Logging Tool（CMR） has been employed to characterize the pore system of the limestone reservoirs.The result of the CMR pore size distribution indicated the good agreement with the core data in general.The permeability of the CMR also has good agreement with the core data.The NMR can evaluate the reservoir accurately.

关 键 词：颗粒灰岩 泥粒灰岩 孔隙结构 电阻 孔径 T2谱 

分 类 号：P631[天文地球—地质矿产勘探]