估测地下多组系统性裂缝间距的原理和应用

A PRINCIPLE TO ESTIMATE A FEW SETS OF SUBSURFACE SYSTEMATIC JOINT SPACINGS AND ITS APPLICATION

单业华 李志安

Shan Yehua Li Zhian

中国地质大学, 北京 100083 2. 中科院长沙大地构造研究所, 410013

China University of Geosciences, Beijing 100083 2. Changsha Institute of Geotectonics, Academia Sinica 410013

本文提出一种估测地下多组系统性裂缝间距的最优化方法,它不需要对裂缝性岩石进行定向,就能利用岩芯资料估测多组裂缝间距。采用理想的裂缝模型验证该方法的有效性,发现在同一观察次数下裂缝间距之积要比单纯的裂缝间距更能准确地被估测出。最后应用它来估测鄂尔多斯地台油田南二区三叠系延长组六段储层的多组裂缝间距。

In this paper,an optimum method is suggested to estimate a few sets of subsurface systematic joint spacings.Instead of fractured rock orientation,core data are used to estimate a few sets of joint spacings.In order to confirm the efficiency of this method,an ideal fracture model is set up.It is discovered that the product of joint spacings is estimated more accurately than joint spacings alone under the same times of observations.Finally,the method is applied in estimating a few sets of joint spacings of reservoir in the 6th member of Triassic Yanchang Formation at the southern 2nd region of Jingan oil field in the Ordos Platform.

https://doi.org/10.11781/sysydz199803297