高校地质学报2016，Vol.22Issue(1)：171-182,12.DOI:10.16108/j.issn1006-7493.2015238
构造物理模拟和PIV有限应变分析对构造裂缝预测的启示
Structural Analogue Modeling and PIV Finite Strain Analysis: Implications to Tectonic Fracture Prediction
摘要
Abstract
The development of structural fractures and finite strain state are closely related in the oil and gas reservoir. In order to explore a new method of finite strain analysis and structural fracture prediction, this study designed and performed a set of sandbox experiments. The particle image velocimetry (PIV) technique was applied to quantitatively analyze the experimental process. The experimental model was a unilateral indentation model with a viscous layer in the vertical direction, and the results represent a macroscopic box fold. Using the PIV technique, we can obtain the displacement field data during the deformation process in each stage of the experiments, calculate the incremental strain in each step, and analyze the finite strain state during the whole deformation process from the initial stage to the time after the fold was formed. Furthermore, the genesis mechanism and distribution can be discussed to quantiatively predict the fractures. At the beginning of the deformation, the finite strain was weak (about 4-8%) and widely distributed. Weak compressive linear strain was represented in the direction of indentation and weak tensile linear strain in the vertical direction. These phenomena were interpreted as the results of the pure shear deformation, such as the thickening and parallel shortening of the layers before the folding and faulting initiated. It is also the main mechanism of the formation of the regional tension fissures and shear cracks. The finite strain was localized in the fault zone and the adjacent area when the fold and fault formed. Strong shear and tensile shear strain (up to 20%) was revealed. These were the results of the simple shear deformation along the fault plane. It is also the main mechanism of the formation of the local shear fractures and tensile shear cracks.关键词
物理模拟/粒子图像测速(PIV)/有限应变分析/构造裂缝预测Key words
analogue modeling/particle image velocimetry (PIV)/finite strain analysis/tectonic fracture prediction分类
天文与地球科学引用本文复制引用
沈礼,贾东,尹宏伟,魏东涛,陈竹新,孙闯,崔键..构造物理模拟和PIV有限应变分析对构造裂缝预测的启示[J].高校地质学报,2016,22(1):171-182,12.基金项目
江苏省科技项目(BE2013115) （BE2013115）
国家科技重大专项(2011ZX05009-001 （）
2011ZX05003-002)联合资助 （）
