特征曲线重构后波阻抗反演在塔南油田的应用

APPLICATION OF THE RECONSTRUCTED WAVE IMPEDANCE INVERSION BY THE CHARACTERISTIC LOG IN TANAN OILFIELD

为了解决塔南凹陷东部南屯组岩性识别困难、储层预测精度差的难题,采用重构高电阻率泥岩段特征曲线、突出储层与围岩差异的反演方法进行了储层预测。结果表明,针对具有高电阻率的围岩或井壁垮塌、钻井液侵入的围岩(均为较厚的泥岩)进行特征曲线重构能够有效降低声波时差响应值低、密度测井值低所产生的影响,对地质特征相似区域的储层识别具有指导意义。

To solve the difficulties of the lithological identification and poor predicted accuracy of the reservoirs in Nantun Formation in the eastern part of Tanan Sag, the reservoir prediction is conducted by means of the inverting methods of reconstructing the characteristic curve of high mudstone-interval resistivity and presenting the difference between the reservoirs and neighboring rocks. The results show that for the neighboring rocks with higher resistivity or with the collapsed borehole wall and mud invasion （ all the mudstones are rather thicker} , the reconstruction of the characteristic curves can effectively reduce the influences caused by the lower response values of the interval transit time and the density logging, thus the achievements stated above possess a certain reference significances for the reservoir identification in the regions with similar geological characteristics.