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小型压裂是认识储层特征、为主压裂设计和修改提供依据的一种重要手段。但是对于气藏特别是低渗气藏，考虑到储层伤害及排液影响，进行小型压裂测试的机会不多。文章介绍了小型压裂和主压裂技术在我国某低渗气藏的应用情况，并通过小型压裂的井温曲线分析、小型压裂净压力拟合分析、主压裂净压力拟合分析，提出必须要将小型压裂与主压裂资料综合分析，才能做到既认识储层，又达到了优化压裂设计的目的。同时还研究了两种压裂方式对裂缝垂向延伸的影响。

Comparison of Mini-fracturing and Main-Fracturing and the Fracture Vertically Extending Law

Mini-fracturing is an important tool to understand reservoir characteristics and provide data for the design and improvement of main-fracturing. But for gas reservoirs, especially for low-permeability gas reservoirs, the chance to conduct mini-fracturing is a little because worrying about the reservoir damage and the problem of fracturing fluid flow-back. The article introduces the application of mini-fracturing and main-fracturing in a low-permeability gas reservoir of China. According to the temperature profile logging of mini-fracturing and the net-pressure fitting analysis of mini-fracturing and main-fracturing, it is pointed out that integrative analysis of mini-fracturing and main-fracturing data is necessary to understand reservoirs and optimize fracturing designs. Also, the influence of mini-fracturing and main-fracturing on fracture vertically extending is investigated.