火山岩中的复杂断裂传播行为:一项实验研究
Jianfa Ci1, Junfeng Wang1, Xiaopeng Chen2
1Petroleum Engineering Research Institute of Southwest Oil and Gas Company, SINOPEC, Deyang 618000, China.
ACS omega
|November 25, 2024
概括
在火山水库中的水力压裂通过连接自然断层来创建复杂的断层网络. 低粘度流体和超临界二氧化碳增强骨折复杂性和连接性,优化刺激.
科学领域:
- 石油工程是石油工程中的一个.
- 地质科学是地球科学.
- 岩石机械学 岩石机械学
背景情况:
- 火山岩储水池对水力压裂具有独特的挑战,原因是异质性和自然断裂.
- 有效的水库刺激依赖于创建复杂的骨折网络,这些网络与先前存在的自然骨折相连.
- 了解这些复杂的地质环境中的断裂传播对于优化碳化合物回收至关重要.
研究的目的:
- 在模拟的现场条件下,研究火山岩水库中的断裂传播行为.
- 分析自然断裂,流体粘度和断裂流体类型对断裂网络复杂性的影响.
- 为优化火山水库中的水力压裂参数提供理论基础.
主要方法:
- 真正的三轴破裂模拟实验是在埃米山浮点的火山岩样本上进行的.
- 采用了碎裂后的样本分割,压力曲线分析和声辐射测试.
- 评估了自然断裂存在,流体粘度 (滑水) 和裂纹流体类型 (超临界CO2) 的影响.
主要成果:
- 火山水库表现出显著的异质性,具有发达的自然断层,可以相互连接.
- 骨折形态的特点是主要,次要的垂直和次要的水平骨折,水平骨折影响骨折高度.
- 观察到不同的故障模式:矩阵主导区域的剪切扩张和自然裂纹丰富区域的剪切滑动.
- 低粘度的滑水通过入自然断裂,促进复杂的断裂形成.
- 超临界二氧化碳由于其透能力,增加了断裂复杂性和网络形成.
结论:
- 自然断裂显著影响火山水库中的断裂传播和网络复杂性.
- 流体特性,特别是粘度和类型,在实现所需的断裂复杂性方面发挥着关键作用.
- 优化压裂流体选择和参数控制对于成功刺激火山密集水库至关重要.
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