塔中地区奥陶系碳酸盐岩地层纵波速度各向异性参数估算  

Anisotropic Parameters Estimation of P-wave Velocity in the Ordovician Carbonate Rock Formation in Tazhong Oil Field

作　　者：张林[1] 张承森[2] 谢芳[1] 刘瑞林[1] 

机构地区：[1]长江大学地球物理与石油资源学院,湖北武汉430100 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《工程地球物理学报》2016年第1期64-70,共7页Chinese Journal of Engineering Geophysics

摘　　要：统计的测井资料中声波时差和对应井斜角数据,结合Thomsen纵波速度公式估算横向各向同性介质的各向异性系数,是研究横向各向同性介质的一种新思路。声波测井可直接测量地层的纵波时差(速度),井斜测井测量的井斜角可以表达声波的传播方向。统计塔中地区奥陶系碳酸盐岩地层中13口直井、斜井73层致密段的井斜角、声波时差和密度值数据,结合Thomsen的横向各向同性介质中纵波速度公式,对塔里木盆地塔中地区奥陶系碳酸盐岩地层弹性各向异性参数进行估算,得出该地区碳酸盐岩地层纵波速度各向异性参数为f=0.622 5,ε=0.04,δ=-0.185。随着井斜角的增加,纵波速度呈现先减小后增大的变化,井斜角在40°左右时纵波速度最小,井斜角在90°时纵波速度最大。论文也讨论了在上述各向异性条件下,不同井斜角对声波孔隙度计算和不同传播方向的纵波对走时计算影响。Estimating the anisotropy coefficient of transverse isotropic medium with the velocity of longitudinal wave and the Thomsen formula of transversely isotropic medium is a new method to study transversely isotropic medium. Acoustic well logging can directly measure the acoustic interval transit time or velocity of P-wave in formation, and inclination angle measured by inclination well logging can express the direction of acoustic wave propagation. By gathering the statistics about the well angle, sonic and density data of P-wave velocity of 13 vertical, inclined wells with 73 layers in Tazhong oil field in Tarim Basin, and combining with Thomsen formula of transversely isotropic medium, anisotropic parameters of Ordovician carbonate rock in Tarim Basin are estimated and P-wave velocity anisotropy parameters in this oil field are f=0. 6225,ε=0.04,δ=-0. 185. With the increasing of the well angle, the P-wave velocity decreases first and then increases, and the velocity is the lowest about in the angle 40°, while largest in the angle 90°. The influence of different angle in well logging on the calculation of the acoustic porosity and the travel time of P-wave in different propagation direction are also discussed in this paper.

关 键 词：横向各向同性 各向异性参数 碳酸盐岩 纵波速度 

分 类 号：P631.3[天文地球—地质矿产勘探]