煤层气储层裂缝特征及三维地震裂缝预测应用分析

Fracture Characteristics of Coalbed Gas Reservoir and Analysis of Three-dimensional Seismic Fracture Prediction

煤储层中存在的裂缝既是煤层气产量的决定因素,又是地震波传播特征的重要诱因。认识煤层中裂缝的成因和类型,根据地震勘探原理,指出地震可识别的煤层裂缝类型,对裂缝进行预测和评价具有重要的意义。首先利用叠后三维地震的多种裂缝预测方法,提取目标层不同类型的裂缝预测数据,然后通过数值处理,精细划定裂缝发育范围和裂缝级别,将层属性、体属性裂缝发育区分划分成四个等级。最后在此基础上对其进行评价。这为煤层气的开发和提高煤层气产量提供了很好的指导依据。

Fractures in coal reservoirs are the decisive factor of CBM production and the important inducement of seismic wave propagation characteristics. According to the principle of seismic exploration, it is pointed out that the types of coal seam cracks that can be identified by earthquake are of great significance for the prediction and evaluation of cracks. In this paper, different types of fracture prediction data of target layer are extracted by various fracture prediction methods of post-stack three-dimensional seismic. Through numerical processing, the development range and level of fracture are delineated, and the fracture development of layer attribute and body attribute is divided into four grades. On this basis, it is evaluated, which provides a good guidance for the development of gas reservoir and the increase of gas production.