大庆油田T30井区扶余油层致密储层岩石力学参数建模

Rock mechanical parameter modeling of Fuyu tight oil reservoir in Well Block T30 of Daqing Oilfield

致密油储层需要压裂改造才能获得工业产能,泊松比、弹性模量及脆性指数等岩石力学参数是研究和模拟储层压裂改造的基础参数。针对大庆外围扶余油层致密储层岩性、物性、含油性等非均质性强,岩石力学参数随储层变化而表征难度大的问题,以T30井区扶余油层为研究对象,在岩石实验数据基础上,进行实验参数测井段标定,得到泊松比、弹性模量等岩石力学参数与纵、横波和密度等电测参数解释模型,实现动态参数和静态参数的转换,计算和表征弹性力学参数。利用弹性波动理论结合常规测井资料计算岩石力学参数,在三维地质模型基础上,建立三维泊松比、弹性模量和地应力场等岩石力学参数模型,为储层可压性评价和压裂模拟奠定了基础。

Tight oil reservoirs need fracturing to achieve the industrial productivity,and the Poisson's ratio,elastic modulus and brittleness index are the basic parameters for studying and simulating the reservoir fracturing.In view of the strong heterogeneities of the lithology,physical property and oil-bearing property of the Fuyu tight oil reservoir of Daqing periphery,it is difficult to characterize the rock mechanical parameters with the change of the reservoirs.Taking Fuyu oil layer in Well Block T30 as the study object,on the basis of the rock tested data,the logging section calibration of the experimental parameters was carried out,and the interpretation model of the rock mechanical parameters such as the Poisson's ratio,elastic modulus and the electrical logging parameters such as the P-wave,S-wave and density were obtained,thus the conversion from the dynamic parameters to the static parameters was realized,and moreover the elastic mechanical parameters were calculated and characterized.With the help of elastic wave theory,combined with the conventional logging data,the rock strength parameters were calculated.Based on the 3D geological model,the rock mechanical parameter models of the Poisson's ratio,elastic modulus,and in-situ stress field were established,which have laid the foundation for the reservoir compressibility evaluation and the fracturing simulation.