摘要
伊拉克艾哈代布（AHDEB）油田主要产油层位分布在中白垩统的海相碳酸盐岩中,储层岩性以颗粒灰岩为主.储层平均孔隙度15％,平均渗透率2.746 mD.储层测井响应特征包括自然伽玛≤25 API,声波≥65 μs/ft（速度≤4 690 m/s）,密度≤2.52 g/cm3.岩性的区分采用基于宽带约束的波阻抗反演,颗粒灰岩阻抗在10000～11 400 （m/s）·（g/cm3）之间,泥灰岩阻抗大于114 000 （m/s）·（g/cm3）,泥晶灰岩阻抗在6 000 ～ 10 000 （m/s）·（g/cm3）之间.在岩性区分的基础上,利用神经网络得到波阻抗与孔隙度的最佳匹配,相关度达到0.953.然后进行孔隙度反演,反演结果与岩心孔隙度吻合误差小于1％.
The main product layer of AHDEB oil field is Middle Cretaceous formation,which is a marine a car- bonate reservoir and the lithology is grain limestone. The average porosity of the reservoir is 15% and the average permeability is 2. 746 mD. The well logging characters of the reservoir is GR≤25API, AC ≥65 μs/ft, Den ≤2.52 g/cm3 o The acoustic impedance of different lithology is： granular limestone 10 000 -11 400 （m/s） . （g/cm3）, Marlite ： ≥ 114 000 （m/s） · （ g/cm3 ） , micritic limestone ： 6 000 - 10 000 （m/s） · （ g/cm3 ）. So the lithology can be identified by acoustic impedance which can be obtained by band constrained inversion of seismic data. The im- pedance was coorelated with porosity at well, the correlation coefficient is up to 0. 953. And then the impedance was mapped to core porosity with error less than 1%.
出处
《科学技术与工程》
北大核心
2013年第32期9649-9654,共6页
Science Technology and Engineering
关键词
储层特征
波阻抗
孔隙度
反演
reservoir characters impedance porosity inversion
