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针对传统油气层评价方法不能有效地处理和充分解释煤层气层全烃值异常的情况,本文从煤层气地质的角度分析了煤层的厚度、煤体结构、地层压力对煤层气井全烃异常高值的影响。研究表明:煤层厚度越厚,气测全烃异常值越高;与原生结构煤相比,碎裂煤和粉煤更能使全烃值出现异常高值;地层压力与钻井液液柱压力差,也是影响气测全烃值异常的重要地质因素。
In view of the fact that the traditional method of reservoir evaluation can not effectively deal with and fully explain the abnormality of total hydrocarbon in CBM, this paper analyzes the influence of coal seam thickness, coal structure and formation pressure on the total hydrocarbon anomalies Impact. The results show that the thicker the coal seam, the higher the abnormal total hydrocarbon measured by gas. Compared with the primary structure coal, the fractured coal and pulverized coal can make the hydrocarbon value unusually high. The difference between the formation pressure and the drilling liquid column pressure , Which is also an important geological factor that affects the abnormality of total hydrocarbon in gas measurement.