有色反演技术在海外A油田评价中的应用

Application of colored inversion technology in overseas evaluation of A oilfield

近年来出现的有色反演技术是一种频率域测井约束下的地震反演新技术,其核心是设计匹配算子使地震频谱和井的波阻抗频谱相匹配,该技术具有无需初始模型、受人为干扰小和计算速度快等方面的优势,特别适用于海外勘探项目评价中常遇到钻井少、研究时间短的问题。海外A油田的实际应用表明,低通频率是影响匹配算子的关键参数,反演结果在保留地震数据原有地质特征基础上,增加了测井数据的高频信息,改善了反演结果的分辨率。针对研究区油层具有明显相对低纵波阻抗的特征,通过定量标定,可快速清晰地刻画和识别油层。经2017年新钻井证实,油层解释结果可靠。

Colored inversion is a new technique of seismic inversion under the constraint of frequency domain logging.The core of the technique is to design a matching operator to match the seismic spectrum with the wave impedance spectrum of the well.This technique has the advantages of no initial model,little interference and fast computation speed,which is especially suitable for overseas exploration project evaluation with problems of little drilling and short research time.The practical application of overseas A oilfield shows that the low pass frequency is the key parameter affecting the matching operator,and the inversion results,on the basis of retaining the original geological characteristics of seismic data,can increase the high frequency information of logging data and improve the resolution of the inversion results.Aiming at the characteristics of relatively low P wave impedance of oil layers in the study area,the oil layers can be characterized and identified quickly and clearly by quantitative calibration.New drillings in 2017 confirmed that the reservoir interpretation results are reliable.