摘要
研究结果表明:储集层并非在整个毛管压力的区间内都具有分形特征,而只是在毛管压力Pc大于某一压力值下限P0时,其孔隙结构才具有统计的自相似性。分形维数可以定量描述储集层孔隙结构的复杂程度,分形维数越大,表明储集层孔隙结构的复杂程度越大,非均质性越强。分形维数与矩法所计算的孔喉分选系数Sp虽然研究手段不同、求得的途径不同,但呈较好的正相关关系,有着类似的意义,均是反映孔隙结构复杂程度的参数。应用该方法研究东濮凹陷桥口地区沙河街组沙三段凝析气藏储集层孔隙结构,取得了较好的效果。
The study results show not all reservoirs have the fractal features in the whole range of capillary pressure.The pore micro-geometry hasn't statistical self-similarity until capillary pressure P_c exceeds the lower limit of some pressure P_0(i.e.P_c>P_0).Complexity of pore micro-geometry of reservoirs can be quantitatively described by fractal dimensions.The more the fractal dimensions are,the higher the complexity of pore micro-geometry of reservoirs is and the stronger the heterogeneity is.The sorting coefficients Sp of pore throats calculated by the fractal dimensions and the moment method respectively all appear in good positive correlation,although they are derived with different tools and ways,and they have similar sense.They are all the parameters to reflect the complexity of pore micro-geometry.With the method to study the pore micro-geometry of the condensate gas reservoir of Sha Section 3, Shahejie Group in Qiaokou area of Dongpu depression,good results are achieved.
出处
《天然气勘探与开发》
2005年第4期9-11,19,共4页
Natural Gas Exploration and Development
基金
中国石化股份有限公司油田事业部勘探先导项目"东濮凹陷东部含气区深层凝析气藏评价及储层改造攻关"
关键词
分形几何学
碎屑岩
储集层
孔隙结构
分形模型
fractal geometry,clastic reservoir,pore microgeometry,fractal model
