露头区辫状河砂体建模方法探讨

脑包山露头区辫状河砂体位于张家口尚义县,通过大比例尺实测及密集采样,结合沉积学研究,分析其渗透率的分布。在此基础上,选择其中几条测线上的样品,分别利用条件模拟和分形几何法对砂体的渗透率进行了建模方法研究。通过求取渗透率的变差函数,建立条件模拟模型;通过对渗透率进行赫斯特指数的计算,同时利用分形插值理论建立分形模型。通过对比分析,条件模型较好地再现了储层非均质性,而分形模型既反映了宏观上物性分布,又反映了其内部非均质性变化。两种方法均是研究储层非均质性的有效手段,可互为补充。

AN APPROACH TO MODELLING METHODS OF BRAIDED RIVER SANDBODIES IN OUTCROP AREA

Naobaoshan braided sandbodies are situated in Shangyi County,Hebei Province The permeability of the sandbodies are analysed by combining actual measurement in a large scale with sedimentology Samples of some lines are chosen Conditional simulation method and fractal geometry method are used separately in the modelling of the permeability of the sandbodies Conditional simulation model is built based on the variogram of the permeability;fractal model is built according to Hurst index that is calculated based on permeability and interpolation theory The results suggest that conditional model could recur the heterogeneity of the reservoir,the fractal model could reveal both the macroscopic physical property and microscopic heterogeneity These two methods are efficient in heterogeneity researches,and could be in compensation for each other