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在阿尔善油田进入开发之前,应用合成声波测井剖面技术对油层进行横向预测是减少钻探失误的一项重要措施。构造简单、平缓,目的层埋藏浅,地震测网密,地震资料质量较好,又有质量好的实测声波资料是制作高质量合成声波测井剖面的必要条件。由过井地震道转换的合成声波测井曲线的精度,取决于振幅处理的精度,波形质量和获取低频及高频信息的程度。过井地震道转换的合成声波测井曲线和该井实测声波曲线的相似性是合成声波测井剖面解释的基础。此外,要十分重视测线交点处合成声波速度的闭合和储层速度的标定。在本文所述的条件下,利用速度特征研究储层,其厚度一般不小于50m。本文利用合成声波速度剖面对阿尔善油田进行了横向预测,已被5口井证实,其中在预测范围内有3口井钻遇油层,在预测范围外的两口井未见油。
Before the Arshan oilfield was developed, the application of synthetic sonic logging profiling technology to lateral prediction of oil reservoirs was an important measure to reduce drilling errors. The structure is simple and gentle, the target layer is shallow buried, the seismometer is dense, the seismic data quality is good, and the good measured sound wave data is a necessary condition for making high-quality synthetic sonic log sections. The accuracy of a synthetic acoustic logging curve converted from a viable seismic trace depends on the accuracy of the amplitude processing, the quality of the waveform, and the degree of acquisition of low and high frequency information. The similarity between the synthetic acoustic logging curves converted from over-the-hole trace and the measured acoustic curve of the well is the basis for the interpretation of synthetic acoustic logging profiles. In addition, pay close attention to the closing of synthetic sonic velocity at the intersection of survey lines and calibration of reservoir velocity. Under the conditions described in this paper, the velocity characteristics of reservoir research, its thickness is generally not less than 50m. In this paper, the horizontal prediction of the Aeshan oil field has been carried out by using the synthetic acoustic velocity profile. It has been confirmed by 5 wells, of which 3 wells were drilled in the predicted range and no oil was observed in the two wells outside the predicted range.