斯通利波裂缝渗透率计算模型与应用

Calculation model and application of fracture permeability based on Stoneley wave

陈渊博 章成广 蔡明 张泽天

长江大学油气资源与勘探技术教育部重点实验室，湖北 武汉 430100 长江大学地球物理与石油资源学院，湖北 武汉 430100 中国石化河南油田分公司安全环保部，河南 南阳 473132

塔里木库车地区发育致密砂岩储层，如何准确评价储层裂缝渗透性是油田面临的主要问题。针对这一问题，利用含人工造缝岩心开展了裂缝渗透率测量实验，根据实验结果对裂缝渗透率理论公式进行刻度，结合斯通利波能量衰减系数与裂缝张开度的关系，建立了裂缝渗透率计算模型并进行应用。结果表明：实验测得裂缝渗透率与裂缝张开度具有良好的相关性；刻度后的裂缝渗透率模型计算的渗透率与试井渗透率吻合较好，裂缝渗透率评价结果与产能测试数据匹配较好。试井渗透率和厚度乘积与模型计算的平均渗透率和厚度乘积的对比结果表明，模型计算所得渗透率相对误差小于20%，满足目前裂缝渗透性评价的需求。

The Kuqa area in Tarim belongs to tight sandstone reservoirs. How to accurately evaluate the permeability of reservoir fractures is the main problem faced by the oilfield. To solve the problem, a fracture permeability measurement experiment was carried out using  core containing artificial fractures, and the experimental results were used to calibrate the theoretical formula of fracture permeability. Combining the relationship between Stoneley wave energy attenuation coefficient and fracture opening degree, a fracture permeability calculation model was established and applied. The results show that the experimentally measured fracture permeability has a good correlation with the fracture opening degree; the permeability calculated by the calibrated fracture permeability calculation model is in good agreement with the well test permeability, and the fracture permeability evaluation results match the test productivity data well. The comparison result of the product of permeablity and thickness by well test and the average product of  permeablity and thickness calculated by this model shows that the relative error of the calculated permeability of this model is less than 20%, which meets the current fracture permeability evaluation requirements.

10.6056/dkyqt202205006