微地震在页岩气水平井压裂中的作用

Role of Microseism in Shale-Gas Horizontal Well Fracturing

页岩气压裂设计上主要采用体积改造,施工上采用井工厂模式,通过裂缝的复杂化增大泄气面积,实现气井的增产。在压裂过程中储层容易出现剪切滑移,产生微地震事件,能被检波器检测到。通过微地震事件的分析,可以判断裂缝的几何形态,裂缝复杂程度,裂缝延伸情况,裂缝参数及改造体积等。在不同的净压力下,微地震也不同,通过微地震事件分析有助于了解不同施工情况下裂缝的形态,有助于加深工艺的认识,提高措施的效果。

Volume transformation is adopted in design and well factory pattern in operation in shale gas fracturing.Making fractures complicated can enlarge gas discharge area to increase production of gas wells.In the process of fracturing,it is easy to cause shear slip in the reservoir stratum and generate microseism events which can be detected by the geophone.Microseism events are different in different net pressures.The analysis of microseism events are helpful in estimating fractures＇ geometric shape,complexity,extension status,parameters and transformation volume and in deepening understanding of the technology and improving countermeasures.