横向各向同性地层地应力的研究

根据岩石的沉积特点，将地层岩石假设为横向各向同性体，推导了横向各向同性地层地应力的计算式，给出了倾斜地层岩石弹性参数的转换公式和横向各向同性地层破裂压力的计算式及破裂压力的计算实例，并将其与各向同性计算值进行了比较。结果表明，考虑各向异性对地应力的影响，其计算值与地层实际更接近。

A STUDY OF IN-SITU STRESSES IN TRANSVERSELY ISOTROPIC FORMATIONS

In this paper,on the basis of sedimentary texture of the rocks,the formations are considered as transversely isotropic mate rials. The equations of three principal in situ stresses,the converting formula of elastic parameters in tilted formations and the calculated equation of formation fracture pressures (EFFP) in transversely isotropic formation are given.In this paper,the oilfields practical data are used as an example.Comparing two calculated values of isotropic EFFP and transversely isotropic EFFP show that it must be considered of the anisotropic in in situ stresses application and the transversely isotropic EFFP has less error.