玛湖凹陷砾岩裂缝扩展数值模拟

doi:10.7657/XJPG20220215

摘要/Abstract

摘要：

玛湖凹陷砾岩裂缝扩展规律不清晰,其影响因素也不明确。构建多相混合介质砾岩数值模拟模型,对不同加载方式、不同特征砾岩的裂缝扩展规律进行研究。结果表明,砾石含量越高,胶结强度越低,砾石和基质的相对强度越大,则砾岩形成的裂缝越复杂;拉伸载荷和剪切载荷共同作用下砾岩裂缝最为复杂;砾石对砾岩裂缝的吸引作用和屏蔽作用促进砾岩形成复杂缝网。

关键词: 玛湖凹陷, 砾岩, 裂缝, 数值模拟, 模型, 扩展规律, 多相混合介质, 连续介质离散元方法

Abstract:

For the conglomerate in the Mahu sag, the law and controlling factors of fracture propagation are unclear. A numerical simulation model for conglomerate was constructed to analyze the law of fracture propagation in conglomerate with different material properties under different loading modes. The results show that the higher the gravel content, the lower the cementation strength and the greater the relative strength of gravel to matrix, the more complex the fractures created in the conglomerate. Influenced by loading mode, the most complex fractures are created in the conglomerate under the combined action of tensile and shear loads. The attracting and shielding effects of gravel on conglomerate fractures promote the formation of complex fracture network in the conglomerate.

Key words: Mahu sag, conglomerate, fracture, numerical simulation, model, propagation law, multiphase medium, continuum-based discrete element method

中图分类号:

TE357

刘鹏宇, 蒋庆平, 申颍浩, 赵廷峰, 葛洪魁, 周东. 玛湖凹陷砾岩裂缝扩展数值模拟[J]. 新疆石油地质, 2022, 43(2): 227-234.

LIU Pengyu, JIANG Qingping, SHEN Yinghao, ZHAO Tingfeng, GE Hongkui, ZHOU Dong. Numerical Simulation on Fracture Propagation in Conglomerate in Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(2): 227-234.

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