离散裂缝网络模型在体积压裂裂缝网络模拟上的应用

APPLICATION OF DFN MODEL IN FRACTURE NETWORK SIMULATION BY VOLUME FRACTURING

致密油藏储层渗透率低,地层基质向裂缝渗流受到限制,采用体积压裂“打碎”储集层,形成复杂缝网,能够实现裂缝与油藏的最大接触.由于体积压裂形成体积压裂改造区（SRV区）,常规双翼对称裂缝模型不再适用,新型缝网模型亟待研究.综合测井解释、岩石力学、微地震数据,在测试压裂分析的基础上,通过净压力拟合、缝网拟合,对比了离散裂缝网络（DFN）模型和裂缝簇两种模型,其中DFN模型拟合程度较高,证明DFN模型适合体积压裂裂缝网络模拟.

Because of the low permeability of tight oil reservoirs, the transfusion between the matrix and fractures is limited, volume fracturing technology can ＂break＂ the reservoirs to generate complex fracture network, and then form the largest contact area between the fractures and oil reservoirs. The stimulated reservoir volume （ SRV） resul- ted from the volume fracturing leads to the none application of traditional planar two-wing symmetrical model and urgent study on the new fracture-network model. Through the integration of well logging, rock mechanics and mieroseismic data, based on the minifrac analysis, the comparison between DFN and fracture cluster models is conducted by means of the history matches of the net pressure and fracture networks, and the matched degree of DFN modeling is much better, thus the achievements obtained above show that DFN model is more suitable to the frac- ture-network simulation Of the volume fracturing.