四川盆地志留系龙马溪组页岩气储集层录井解释方法研究

Mud logging interpretation for shale gas reservoir in Longmaxi formation of Silurian System,Sichuan Basin

四川盆地页岩气勘探层系主要是志留系龙马溪组,页岩气储集层评价参数的选取在解释评价中有十分重要的作用。随着XRF元素录井、伽马能谱录井等录井新技术在龙马溪组页岩气储集层中的广泛应用,结合研究区开发生产现状,利用随钻参数建立反映储集层特征的孔隙度、有机碳含量、含气量和脆性指数4个参数计算模型,并用于页岩气解释评价。川南地区龙马溪组页岩气储集层解释评价结果表明,应用随钻参数建立的储集层解释评价模型解释结果与实际基本吻合,能满足现场储集层解释评价需要,具有广泛的应用推广前景。

The shale gas exploration strata in Sichuan Basin are mainly in Longmaxi formation system,Silurian System.The selection of shale gas reservoir evaluation parameters plays an important role in interpretation and evaluation.With the extensive application of new mud logging technologies,such as XRF element logging and gamma spectrometry logging in the shale gas reservoirs in Longmaxi formation,combined with the development and production status of the research area,the parameters while drilling have been used to establish calculation and prediction model for 4 parameters which can reflect reservoir characteristics of porosity,organic carbon content,gas concentration and brittle minerals,and reservoir interpretation and evaluation was performed.The interpretation and evaluation results in shale gas reservoir in Longmaxi formation of southern Sichuan indicated that the interpretation results of reservoir interpretation and evaluation model established with the parameters while drilling are basically consistent with the actual results,which can meet the needs of on-site reservoir interpretation and evaluation,and has extensive application and popularization prospects.