论文部分内容阅读
选取渤海海域古近系19块岩石样品,采用MTS815超声波测试系统进行地层温压状态下的纵波速度与横波速度的测试,获得了上述岩样的纵、横波速度.然后,采用Castagna公式拟合得到了测试数据(纵、横波速度)的Vp-Vs关系式;再采用该关系式和研究区古近系地层的测井(7口取芯井)获得的纵波速度计算横波速度(预测的横波速度);发现预测的横波速度与测井获得的横波速度具有相同的宏观变化规律,但是存在一个常数差值.上述分析结论表明,岩石物理测试获得纵横波速度的关系式不能直接应用于测井的横波速度预测,需要进行常数校正.
A total of 19 rock samples from the Paleogene in the Bohai Sea were selected and the longitudinal and shear wave velocities of the samples were measured by the MTS815 ultrasonic testing system under the conditions of temperature and pressure in the strata. The Vp-Vs relationship of the test data (longitudinal and shear-wave velocities) was calculated. The S-wave velocity (predicted S-wave velocity) was calculated using this relationship and the P-wave velocity obtained from the logging of the Paleogene strata in the study area ). The results show that the predicted S-wave velocity has the same macroscopic variation with the S-wave velocity obtained from the logging, but there is a constant difference. The above conclusion shows that the relationship between P-wave velocity obtained from rock physics test can not be directly applied to well logging Sine wave velocity prediction requires constant correction.