综合求取地应力剖面新方法及其应用

New method for calculating in-situ stress profile and its application

测井方法可以连续测量岩石力学特性,但用于模拟计算应力时,数据误差则较大;岩心测试方法测量的力学特性准确,但数据有限;压裂测试被认为是直接测量就地应力的最佳方法,但受条件限制,该方法较少运用,而且不能获得连续的地应力剖面。文中提出了运用高温高压三轴应力试验测试岩石静态力学特性,利用测井资料计算岩层动态力学特性,建立起动、静态力学参数的关系,然后获得静态岩石力学参数的纵向连续数据,并结合压裂施工数据来确定分层地应力模型,从而获得地应力剖面的新方法。利用这一方法对二连盆地XX区块建立了分层地应力剖面模型,计算结果与实测数据吻合较好,证明了该方法正确、可靠,为该区的下一步开发提供了有效的技术参数。

Logging method can be used to continuously measure the rock mechanics characteristics, but when used to calculate stress, the data error is large. The mechanical characteristics measured by core testing are accurate, however, the amount of the core testing is little. The fracturing testing technique is taken as the best method to directional survey the in-situ stress, but due to the conditions, it is seldom applied which restricts this method to calculate continuous stress profile. The triaxial stress experiment in high temperature and high pressure is carried out to test the rock static mechanical behavior, and logging data are used to calculate the rock dynamic mechanical behavior. The relation of the static and dynamic parameters is established, and then the static rock mechanical characteristics in longitudinal can be obtained. Combined with the layered stress profile model from the fractured testing, the in-situ stress profile can be obtained. The layered stress profile model is established in XX block in Erlian Basin, and the calculated result coincides with the actual measurement,so using the method to predict the in-situ stress profile is feasible, which provides effective parameters for the further development.