利用测井、压裂资料求取储层地应力的方法

地应力和破裂压力是十分重要的工程基础参数.文中利用声波、密度和自然伽马等测井资料计算出地层岩石动态力学参数;由于实际工程中采用的是岩石静态力学参数,故通过拟合的动静态参数转换关系式计算出了岩石力学静态参数;实际工程应用必须考虑构造应力,结合典型井段的压裂资料和测井资料反算出地层构造应力系数,结合地应力计算模型和破裂压力计算模型,使用VB6.0编程计算地应力.以×井3 590～3 920 m层段为例,计算出岩石力学参数、地应力和破裂压力连续剖面.该层段构造应力系数为0.462和0.586;最小水平主应力62.417～84.565MPa;最大水平主应力67.651～94.474 MPa;破裂压力75.346～93.241MPa.文中所使用的方法计算结果精度高、实用性强.

Method for obtaining ground stress of reservoir using logging and fracturing data

Ground stress and fracture pressure are very important basic parameters of petroleum engineering.Using acoustic density and natural gamma logging data,this paper can calculate rock mechanic parameters.The parameters used in actual engineering are static,so the conversion relationship of static and dynamic fitted is used to calculate static rock mechanics parameters.Actually,the tectonic stress must be considered.Combining with the fracturing data and logging data,the tectonic stress coefficients can be calculated.Combining with ground stress and fracture pressure model and using VB 6.0 to program,this paper develops software to calculate the ground stress and fracture pressure.Taking the layer 3,590-3,920 m of some well as an example and based on the calculation software,the rock mechanic parameters and the continuous profiles of ground stress and fracture pressure are gotten.The tectonic stress coefficient of this interval is 0.462 and 0.462; the minimum horizontal principal stress is 62.417-84.565 MPa; the maximum horizontal principal stress is 67.651-94.474 MPa; the fracture pressure is 75.346-93.241 MPa.The calculation method used in this paper has high precision and strong practicability.