Abstract: Fracture description after fracturing of shale gas wells is crucial to the prediction of production performance of shale gas wells, the design of repeated fracturing in the production tail, and the wellbore trajectory design of infill wells. Based on the parameters of development and geology of the Fuling shale gas field and the numerical simulation method of efficient discrete fracture network (EDFN), this paper studies the effects of fracture length, total fracture cumulative length of the fracturing section, fracture interval, and relative position of fractures on the contribution rate of the fracturing section, and performs the inversion of the discrete fracture network using fracture characteristic parameters obtained by interpreting the production performance of horizontal wells. Based on the correlation among gas production profile, gas production contribution rate and fracture characteristic parameters of the JY46-3HF development well, this paper establishes a model of fracturing fracture network, and the simulation results of the gas production contribution rate of each fracturing section are highly consistent with the actual measured results. The research results show that the contribution rate of gas production is positively correlated with the total cumulative length of the fracturing section in each fracturing section; the fracture interval and relative position of the fractures affect the contribution rate of the fracturing section to shale gas wells by influencing the degree of fracture control over the matrix area.

Key words: gas production profile, fracture network, dynamic analysis, shale gas reservoirs, inversion

摘要： 页岩气井压后裂缝描述对页岩气井生产动态预测、生产后期重复压裂设计以及加密井井眼轨迹设计等具有重要意义。以涪陵页岩气田开发和地质参数为基础，基于高效离散裂缝网络（EDFN）数值模拟方法，研究裂缝长度、压裂段裂缝累计总长、裂缝间距、裂缝相对位置等对压裂段贡献率的影响，通过水平井生产动态解释得到的裂缝特征参数反演离散裂缝网络。以JY46-3HF开发井产气剖面、产气贡献率和裂缝特征参数的相关性为基础，建立压裂裂缝网络模型，各压裂段产气贡献率模拟结果和实测结果高度吻合。研究结果表明，压裂段产气贡献率和压裂段裂缝累计总长正相关，裂缝间距、裂缝相对位置则通过影响裂缝对基质区域控制的大小影响压裂段对页岩气井的贡献率。

关键词: 产气剖面, 裂缝网络, 动态分析, 页岩气藏, 反演