油气储集层孔隙表面结构的分形特征研究

本文认为油气储集层的孔隙表面结构是一种分形结构,它具有自相似性和无标度性两重分形特征。定量描述孔隙分形表面复杂程度的有力工具是分维D。D值越接近于2,表面越光滑;D值越接近于3,表面越不规则。本文将孔隙铸体和电镜扫描技术与分子吸附法结合起来研究和测定孔隙表面的分形特征。研究孔隙表面结构的分形特征,对油气储集层的评价、研究残余油气饱和度和提高油气采收率有重大的指导意义。

STUDY OF FRACTAL CHARACTERISTIC OF PORE SURFACE STRUCTURE IN RESERVOIRS

In this paper, the authors considered a reservoir's pore structure to be a fractal structure. The pore-rock interface is an irregular and complex fractal surface. The pore surface has the characteristic of self-similarity, but hasn't characteristic length. The powerful tool to describe the degree of complexity of fractal pore surface quantitatively is fractal dimension, which varies from 2 to 3. The closer the fractal dimension is to 2, the smoother the surface is. The closer the fractal dimension is to 3, the more irregular and complex the surface is. This paper studied and measured the fractal characteristic of pore surface with the technique of impregnating pore space. scanning electron microscope and the method of molecular adsorption.Analyzing and studying the fractal characteristic of pore space structure greatly contributes to the evaluation of reservoir, the studying of residual oil (or gas) saturation and the raising of oil (or gas) recovery percent.