针对目前页岩气水平井部分压裂段簇产量贡献率低，且与相应的地质甜点与工程甜点评价结果吻合程度低的问题,提出应用与压裂后产量相关性更强的甜度概念深化以往甜点研究的不足,在此基础上提出由地质甜度与工程甜度计算的综合甜度即可压度来表征可压性程度的方法。研究及应用结果表明：基于提出的页岩气地质甜度与工程甜度新理念,利用可压度表征可压性的理念与技术方法,增强了水平井分段压裂设计与施工的科学性与实用性；无效段簇占比由33%降至13%~20%,平均单井产量提高35.6%,单簇裂缝改造体积提高约15%,可压度大于0.5时,压裂效果较好。建议进一步加大页岩气可压度评价体系的应用力度,特别是在常压与深层页岩气中的应用与验证,并在应用中进一步完善与迭代升级。

To address the problems of low production contribution rate of some clusters and low matching between geological and engineering sweet spot in some shale gas fracturing wells, a new sweetness concept is proposed which is more relevant to production and can make the shortage of sweet spot research perfect. Based on this concept, the concept of fracness is established and calculated by geological sweetness and engineering sweetness, and it can characterize the degree of fracability. Studies and applications show that based on the proposed new concept of geological sweetness and engineering sweetness of shale gas, the concept of fracness and its calculation method are established to evaluate fracability, which enhances the scientific and practicality of fracturing design and specific implementation. The proportion of invalid clusters decreases from 33% to 13%~20%, the average single-well production increased by 35.6%, SRV of one cluster increased by approximately 15% and the fracturing effect is better when fracness is greater than 0.5. It is recommended to further increase the application of shale gas fracness evaluation system, especially in normal pressure and deep shale gas, and to make further improvement and upgrading in the application.