INFLUENCE OF ROCK MECHANICS PARAMETERS ON DEVELOPMENT OF FRACTURE
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摘要:
弹性模量(E)、泊松比(μ)及密度(ρ)是岩石的重要力学参数, 当其他条件一致时, 在一定程度上影响着裂缝的发育。以塔里木盆地某气田为研究区, 在造缝期古应力场分析的基础上, 利用储层裂缝数值模拟技术, 计算得到储层裂缝孔隙度; 再以裂缝孔隙度为指标, 分析岩石力学参数对裂缝发育程度的影响。研究结果表明, 裂缝孔隙度随弹性模量的增加而增大, 同等应力条件下, 弹性模量越大, 裂缝孔隙度越高, 破裂程度越大; 泊松比小于0.2时, 裂缝孔隙度随泊松比增加而逐渐下降; 泊松比超过0.2后, 裂缝孔隙度随泊松比增加而逐渐增大; 岩石密度对裂缝孔隙度的影响不大, 基本上可以忽略。
Abstract:Elasticity Modulus, Poisson Ratio and density are key mechanical parameters of rocks. They have effect on development of fracture with other conditions unchanged. The study area of this paper is a gasfield in Tarim Basin. Based on the analysis of palaeo-stess field, we calculate the porosity of reservoir fracture through numerical simulation technique. Then we use the fracture porosity as index, and analyze the rock mechanics parameters influence on fracture development. The results show that with the elasticity modulus increasing, the fracture porosity increase, the lager the elasticity modulus the easier for rocks to rupture under the same stress; and when the Poisson Ratio is less than 0.2, with the Poisson Ratio increasing, the fracture porosity decrease; the Poisson Ratio is larger than 0.2, with the Poisson Ratio increasing, the fracture porosity increase. In addition, fracture porosity is not affected by rock density and can be ignored.
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Key words:
- elasticity modulus /
- Poisson Ratio /
- density /
- fracture porosity /
- numerical simulation
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