沁水盆地榆社—武乡深部煤层地震相控反演及煤层气甜点预测

随着勘探程度的不断提高和新技术的不断应用,深部煤层成为重要的关注目标。地震相控反演在地震相界面的控制下提供低频背景约束,保证反演结果可靠性的同时使得反演结果具有明显地质意义。针对沁水盆地榆社—武乡区块深部煤层厚度薄、资料信噪比低、甜点预测困难等问题,在沉积相精细划分、储层物性分析、成藏条件、测井信息约束下,应用地震相控反演精确反演弹性参数及流体敏感因子,预测山西组、太原组3号及15号煤层气"甜点"分布,在中部及北部划分出2个甜点区。预测结果表明,反演结果可较好地预测煤体发育特征,拉梅系数乘密度的煤层气指示因子能可靠预测煤层气甜点区,明显提高了深部煤层气"甜点区"预测精度。

Seismic facies controlled inversion and CBM sweet spot prediction in deep coal seam of Yushe Wuxiang block in Qinshui Basin

With the continuous improvement of exploration and the continuous application of new technology,deep coal seam has become an important target.The seismic facies controlled inversion can provide a low frequency background constraint under the control of seismic facies interface,ensure the reliability of inversion results,and make the inversion result have obvious geological significance.The deep coal reservoir of Yushe Wuxiang block of Qinshui Basin has thin coal seams low signal-to-noise ratio,and is difficult to be described.Using the seismic facies controlled inversion,where the detailed division of sedimentary facies,reservoir physical property analysis,reservoir forming conditions and well log data were made as constrains,the “sweet spot” distribution of the Yushe Wuxiang block was predicted.The sweet spot was distributed at the middle and north of study area.The prediction results show that the inversion results can be used to predict the development characteristics of coal seam,and Lame coefficient multiplied by density can be an indicator to predict the sweet spot,which significantly improves the accuracy of sweet spot prediction for the deep coal of the Yushe Wuxiang block of Qinshui Basin