煤层可压性评价方法研究及应用

Study and Application of Evaluation Methods for the Fracability in Coal Reservoirs

钱玉萍

QIAN Yuping

中海油田服务股份有限公司油田技术事业部，河北三河　065201

Oilfield Technology Department, China Oilfield Services Limited, Sanhe Hebei 065201, China

通过对比基于岩石力学参数与基于弹性波径向变化这两种评价煤岩脆性的方法，分析这两种方法在煤层可压性评价中的应用效果，通过实例分析可看出，基于岩石力学参数计算的煤层脆性指数很低，反映煤岩可压性较差，忽略了微裂缝对煤层可压性的影响；径向速度剖面显示煤层段的径向速度降低最为明显，反映煤岩的可压性较强，这与煤层段的压裂效果也是相符的。所以，对于煤层，基于弹性波速径向变化评价脆性的方法能够更好地反映煤层可压性的强弱。

By comparing the two evaluation methods for the brittleness in coal rocks based on rock mechanical parameters and the radial acoustic velocity variation, the application effect of these two evaluation methods for the fracability in coal reservoirs is analyzed. Through the analysis of examples, it can be seen that the brittleness index of the coal reservoir calculated by rock mechanics parameters is very low, reflecting the poor fracability of the coal reservoir, and ignoring the influence of micro-cracks on the fracability of the coal reservoir. The radial acoustic velocity variation shows that the radial velocity of the coal reservoir decreases most obviously, reflecting the strong fracability of the coal reservoir, which is also consistent with the fracturing effect of the coal reservoir. Therefore, the method for the brittleness evaluation based on the radial acoustic velocity variation can better reflect the fracability in coal reservoirs.

https://doi.org/10.3969/j.issn.1008-2336.2022.01.055