提高补偿密度曲线垂直分辨率的方法

Improving vertical resolution for compensated density curve

华东石油大学, 东营 257062

University of Petroleum(Huadong), Dongying 257062

随着石油勘探程度的提高, 对储集层评价精度的要求也越来越高, 相应地对测井资料的垂直分辨率提出了新的要求。本文采用了一种重新组会长、短源距探测器响应的算法来提高补偿密度曲线的垂直分辨率。用标准“脊助”图密度ρ₀与平均后的短源距探测器密度ρ_near(其分辨率与ρ₀一致)的差值, 对未平均的短源距探测器密度ρ_near进行补偿。通过这种补偿后, 密度测井曲线的垂直分辨率有了明显的提高, 同时又保留了原补偿密度对井眼的补偿能力。把上述算法应用于某油田的几口井, 并与岩芯资料进行了详细对比, 说明这种算法对提高密度曲线的垂直分辨率是有效的。

The ever more detailed oif surveys set an increasingly high demand on reservoir evaluation,which implies that the vertical rcsolution of log data has to be accordingly improved. This paper puts forward an algorithm which improves the vertical resolution for compensated density curve by means of restructuring the responses from large and small spacing sondes, that is, the not averaged density ρ_mear at small spacing sonde is compensated by the differencc between ρ₀, the density dcrived from a reference "spinc-ribs" plot, and ρnear, the averaged density at small spacing sonde (both have the same level in resolution). As a consequence, a noticeable improvement in vertical resolution can be seen in the resulting density curve, while the compensation ability for boreholes remains unchanged. The abovc algorithm proves satisfactory via an application to some well data with the results carefully correlated with the core data.