基于三维地震底板标高模拟方法预测非洲卡鲁盆地煤层气含气量

A prediction for the gas content of coalbed methane in African Karoo basin based on 3D seismic bottom elevation simulation

为了揭示非洲卡鲁盆地煤层地质特征及含气量,对已有的钻孔煤层气资料及三维地震资料进行分析。通过相关关系拟合,获得非洲卡鲁盆地8号煤层底板标高与含气量的预测模型及8号煤层预测的含气量值,再与该煤层钻井的实测含气量进行数据对比验证,预测精度在85%以上,说明这种利用有限的地质资料预测含气量的方法可行。8号煤层预测含气量研究结果表明:非洲卡鲁盆地煤层演化程度较高,生气能力强,构造区成煤条件好,煤层的厚度较大,从构造和水文地质特征推断盆地煤层气富集,属于煤层气资源比较丰富的开发区块。

In order to reveal in African Karoo basin coalbed geological characteristics and the gas content,the existing drilling CBM data and 3D seismic data is analyzed through the correlation fitting for No.8 coal seam floor elevation and African Karoo basin coal prediction model of gas content,coalbed gas content was established based on the known data of coal seam floor elevation model to obtain the forecast of coal seam gas content value,for No.8 with the drilling verifies the data comparison of the measured gas content of coal seam,the prediction accuracy is over 85%,the use of limited geological data to predict gas content of the method is feasible.Studies have shown that African Karoo basin evolution degree of coal seam is higher,angry capability is strong,good tectonic conditions of coal,coal seam thickness is larger,infer basin coalbed methane enrichment in structure and hydrogeological characteristics,belongs to the development blocks of CBM resources abundant,provide the basis for exploration and development work.