致密砾岩储层岩石力学参数及地应力测井评价方法研究

Log Evaluation Method of Rock Mechanics and In-Situ Stress Characteristics of Tight Conglomerate Formations

储层岩石力学和地应力特征是井眼稳定性分析与压裂设计等的基础,为油气钻采工程提供依据。致密砾岩储层岩石非均质性较强、岩石物理响应较复杂,尚无成熟、有效的测井评价方法实现储层岩石力学和地应力的精准评价。通过岩石力学测试,揭示了致密砾岩储层岩石的动态弹性模量、静态弹性模量及岩石力学强度之间的关系。在此基础上将实验所得关系与测井数据相结合,建立砾岩储层岩石动静态弹性参数转换关系,将测试数据与压裂施工数据结合建立了水平地应力测井计算方法。最终形成了一套适用于致密砾岩储层的岩石力学和地应力测井评价方法,并通过实际应用验证了方法的有效性。

Reservoir rock mechanics and in-situ stress characteristics are the basis for wellbore stability analysis and fracturing analysis,and provide a basis for drilling and oilfield development.Tight glutenite reservoirs have strong rock heterogeneity and complex petrophysical responses.There is no mature and effective logging evaluation method to effectively evaluate the rock mechanics and in-situ stress.Based on the rock mechanics tests,this paper reveals the relationship between the dynamic elastic modulus and static elastic modulus and rock mechanical strength of tight glutenite reservoir rocks.On this basis,the relationship obtained from the experiment is combined with the logging data,the dynamic and static elastic parameter conversion relationship of the conglomerate reservoir rock is established,and the test data and the fracturing construction data are combined to establish the in-situ stress log evaluation method.Finally,a set of rock mechanics and in-situ stress log evaluation methods suitable for tight glutenite reservoirs have been formed,and the effectiveness of the methods has been verified through practical applications.