利用岩心资料估测地下一组裂缝分布的原理和应用

PRINCIPLE AND APPLICATION OF ESTIMATION ON THE DISTRIBUTION OF A SET OF SUBSURFACE FRACTURES BY CORE DATA

尹中民 单业华

YIN Zhong-min SHAN Ye-hua

中国科学院长沙大地构造研究所, 410013 2. 青岛海洋大学海洋地球科学学院, 266003

Changsha Institute of Geotectonics, Academia Sinica, Chabgsha, Hunan 410013, China 2. College of MarineEarth Earth Sciences, Qingdao Umiversity of Oceanography, Qingdao, Shandong 266003, Chuna

本文提出一种利用岩心资料估测地下一组裂缝分布的新方法。它需要事先给出裂缝分布型式,才能找出具有给定分布型式的最佳裂缝分布,对于估测一般不确知的地下裂缝分布,可以依次选取不同的分布型式重复采用上述方法,然后比较各自的最小目标函数值,其中具有最小值的就可以认为是实际裂缝分布的最好近似。实例应用表明,当裂缝型式选取合适,上述方法的估测结果与实测值相近,从而能给出实际裂缝分布的最好估测,与Narr和Lerche(1984)的方法相比以下,本方法适用性更广,进而能为油田开必提供更为切合实际、复杂的储层裂缝模型。

A new method to estimate the distribution of a set of subsurface fractures by core data is suggested in this paper.In order to find out optimum distribution of fractures with a given distributive pattern,the pattern must be known in advance.When estimating the distribution of generally undetermined subsurface fractures,the method mentioned above can be used repeatedly selecting different distributive patterns in turn. Then,the respective minimum target function values are compared. Among them, the one with minimum can be considered as the best approximation to practical fracture distribution. Case applications show that if fracture patterns are selected properly, the estimated results from the above-mentioned method are close to measured values;the best estimates for practical fracture distribution can be obtained theredy.

青岛海洋大学青年教师基金

https://doi.org/10.11781/sysydz199904346