砂泥岩间互地层等效岩石力学参数计算模型及其应用

以地层岩石的变形分析为基础,从能量的角度出发,利用应变能理论及能量守恒定律推导出了等效岩石力学参数的一般计算公式,并建立了测井资料计算模型;利用该模型计算了库车坳陷克拉A气田目的层系巴什基奇克组的等效岩石力学参数,并以计算结果为基础进行了应力场及储层裂缝的数值模拟;最后讨论了等效岩石力学参数测井资料计算模型的优点及适用条件。模拟结果显示,储层裂缝集中发育在背斜高点及单斜构造部位,与气田目前的开发实践基本一致,表明了所建模型的合理性;等效岩石力学参数适用于区域性的横向应力场及储层裂缝预测,不适于预测局部或垂向上的储层裂缝分布规律。

CALCULATING MODEL OF EQUIVALENT ROCK MECHANICAL PARAMETERS OF SAND-MUD INTERBED AND ITS APPLICATION

On the basis of the deformation analysis of rocks and on the sense of energy, the general calculating formula of the equivalent rock mechanical parameters is deducted using strain energy theory and energy conservation law, and the logging data calculating model is established. The equivalent rock mechanical parameters of Bashijiqike Formation, the subject reservoir in Kela-A gas field, Kuqa depression, are calculated by the model, and the numerical simulation of stress field and reservoir fractures is carried out on the basis of the calculating result. The simulation demonstrates that reservoir fractures mainly develop on high spot of anticlines and monoclinal structure. This is generally consistent to the current developing practice, and thus the rationality of the model is proved. At last, the advantages and using conditions of the logging data calculating model of equivalent rock mechanical parameters are discussed. It is pointed that the equivalent rock mechanical parameters are suitable for regional and horizontal prediction of stress field and reservoir fractures, not for partial or vertical prediction of distribution regularity of reservoir fractures.