脆性岩储层裂缝定量预测的尝试

A ATTEMPT OF QUANTITIVE PREDICTION OF NATURAL CRACK ON BRITTLE ROCK RESERVOIR

本文由四部分内容组成：（１）根据格里菲斯强度理论，讨论了脆性岩层在应力场（约定张为正）作用下，格里菲斯强度理论的一种破裂准则表示式及其在储层裂缝分析中的应用；（２）给出碳酸盐岩储层古应力场定量分析的三种数学力学模型和计算方法以及古裂缝定量预测可靠程度；（３）提出储层有效张应力概念及描述潜在张裂缝的方法；（４）提供某油田碳酸盐岩储层张裂缝的预测图及其以后通过钻井的检验。

This paper consists of four parts:(1)According to the Griffith theory of brittle strength the formulae of a criterion of failure were derived by author under the stress field (convention is that the tensile stress is positive) and applied them to analysis of the natural crack for reservoir;(2)Three numerical models and computative method of the quantitative analysis for paleo stress as well as a method of the quantitative prediction for paleo naturil crack were given in the reservoir of the carbonate rock;(3)A concept of effect tensile stress was presented a description of the natural tensile crack was provide for reservoir;(4)To provide a predicted tensile crack distribution map for reservoir of the carbonate rock and test it through drilling holes.