地震波形指示反演技术的应用及效果--以玛东斜坡区深层溢流相火山岩为例

Application and Effection of Seismic Waveform Indicate Inversion:A Case Study of Deep Overflow Phase Igneous in Madong Slope

准噶尔盆地玛东斜坡区深层石炭系溢流相火山岩是主要储层之一。由于火山岩储层埋藏深、岩性岩相变化快、纵横向非均质性强、深层探井少等特征,导致常规火山岩岩相预测识别难度大,精度不高。为更精确预测溢流相火山岩的分布,首次在深层火山岩领域应用地震波形指示反演技术进行岩相预测。采用井震结合,挖掘相似波形对应的测井曲线的共性结构信息,充分利用地震波形的横向变化,开展高频成分估计,获得对储层岩性、物性反映较敏感的高分辨率反演数据体。经钻井证实,该方法解决了研究区资料反演结果不理想、模型化严重、精确度不高的问题。提高了高频成分的确定性,准确性更高,使反演结果从完全随机走向逐步确定,为井位部署和储量提交提供可靠依据。

The deep Carboniferous overflow facies volcanic rocks in the Madong slope area of Junggar basin are one of the main reservoirs.Due to the characteristics of igneous rock layers buried deeply,lithology and lithofacies change,strong vertical and horizontal heterogeneity,and few deep exploration wells,the conventional igneous rock lithofacies prediction method is difficult and the accuracy is not high.In order to predict the distribution of overflow facies igneous rocks more accurately,it is the first time to apply the seismic waveform indication inversion technology in the field of deep igneous rocks for lithofacies prediction.The combination of well and earthquake is used to mine the common struc-ture information of logging curves corresponding to similar waveforms,make full use of the lateral changes of seismic waveforms,carry out high-frequency component estimation,and obtain high-resolution inversion data volume sensitive to the reflection of reservoir lithology and physical properties.It is proved by drilling that this method solves the prob-lems of unsatisfactory data inversion results,serious modeling and low accuracy in the study area.It improves the certain-ty and accuracy of high-frequency components,gradually determines the inversion results from a completely random trend,provides a reliable basis for well location deployment and reserve submission,shows a good exploration prospect in this area,and has reference significance for the research of volcanic oil and gas reservoirs in similar areas.