水力压裂储层孔隙度计算方法

Calculation method of porosity of hydraulic fracturing reservoir

孔隙度是对水力压裂施工进行评价的一个重要参数,为准确地计算压裂后储层孔隙度,结合储层压裂前初始孔隙度的测井结果和微地震监测技术的监测结果提出一种水力压裂储层孔隙度计算的新方法。首先对储层孔隙度的计算方法进行分析,然后结合微地震监测技术的监测结果进行新计算方法的推导,最后以一次压裂实验后目标储层孔隙度计算过程为例,证明该计算方法的有效性。结果表明:相较于测井法,利用压裂前测井参数和压裂后微地震监测结果结合的方法能够有效避免压裂对孔隙度测量、计算的影响,计算结果能更合理地反映压裂后储层的孔隙度。

Porosity is an important parameter for the evaluation of hydraulic fracturing. In order to accurately calculate the porosity of fractured reservoir, a new method of calculating porosity of hydraulic fracturing reservoir is proposed by combining the logging results of the initial porosity before fracturing and the monitoring results of micro -seismic monitoring technology. The calculation method of reservoir porosity is analyzed, and then combined with the monitoring results of micro-seismic monitoring technology, the new calculation method is deduced. Finally, the effectiveness of the calculation method is proved by the calculation process of the reservoir porosity after primary fracturing experiment. The results show that compared with the logging method, the method of combining the logging parameters before fracturing and the micro-seismic monitoring results after fracturing can effectively avoid the influence of fracturing on the measurement and calculation of porosity, and the calculation results can reflect the porosity of the fractured reservoir more reasonably.