四川威远页岩气储集层录井解释评价方法

Mud logging interpretation and evaluation method for Weiyuan shale gas reservoirs,Sichuan

录井作为钻井过程中发现油气显示与评价储集层流体性质的重要手段,在页岩气储集层解释评价中如何发挥其优势已成为当前研究的重点。为适应这一需求,针对四川威远页岩气储集层岩性、物性特征,利用气测录井、地球化学分析和X射线荧光元素录井,探讨了反映页岩气储集层含气性和脆性评价的方法和评价标准;在此基础上,通过对该地区多口页岩气井层的统计分析并结合测井孔隙度数据和试气结果,建立了页岩气储集层录井综合解释评价标准。初步实践应用表明该方法对气层的评价效果较好,由于建立标准样本数据的局限性,其对差气层、含气层的评价效果尚有待进一步检验与完善。

As an important means of finding oil and gas shows and evaluating reservoir fluid properties in the process of drilling,mud logging has become the focus of current research on how to exert its advantages in interpretation and evaluation for shale gas reservoirs.In order to meet this requirement,in accordance with characteristics of lithology and physical property for Weiyuan shale gas reservoirs,Sichuan,using gas logging,geochemical analysis and X ray fluorescence element logging,the authors discussed the evaluation method and standards that can reflect the gas-bearing properties and brittleness of shale gas reservoirs.On this basis,through the statistical analysis of layers from shale gas wells in this region and combining with the porosity data of well logging and gas testing results,a comprehensive mud logging interpretation and evaluation criteria for shale gas reservoirs were established.Preliminary practice showed that the method was effective for the evaluation of gas layers,since the sample data for establishing the criteria were limited,the evaluation effects of poor gas layers,gas-bearing layers remain are to be further tested and perfected.