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许多地震属性,比如地震的纵横波速度,泊松比,声波阻抗,都能用来区分不同的岩石类型,利用拉梅阻抗作为进一步的约束来代替声波阻抗能更好的降低结果的非唯一性。我们用这种方法构建了渤海湾地区一条剖面的岩石成分模型。我们简要介绍了区分岩石类型的地震参数,重点在于不同的参数组合对于分辨岩石类型的敏感性。为了与室温常压条件下测得的有代表性的岩石的地震波速度和密度进行对比,我们首先需要做温度和压力的校正。接着,我们需要用已知资料和实验测得的各种岩石样品做对比,来确定研究区的岩石类型。我们收集了渤中凹陷一条剖面的纵波速度资料。该剖面10km深范围内的属于同种岩石类型的不同岩石最终通过地震波速度、泊松比、密度、声波阻抗、以及拉梅阻抗综合约束。
Many seismic attributes, such as seismic wave velocities, Poisson’s ratios, acoustic impedances, can be used to distinguish between different rock types. Using the Lame impedance as a further constraint instead of acoustic impedance can better reduce the non-uniqueness of the results . In this way, we constructed a rock component model of a section in the Bohai Bay region. We briefly describe the seismic parameters that differentiate rock types, with an emphasis on the sensitivity of different parameter combinations to resolving rock types. To compare the seismic wave velocity and density of a representative rock measured at room temperature and pressure, we first need to calibrate the temperature and pressure. Next, we need to compare known and experimental rock samples to determine the type of rock in the study area. We collected longitudinal P-wave velocity data from a section of the Bozhong Sag. The different rocks belonging to the same rock type in the depth of 10 km of this section finally pass the seismic wave velocity, Poisson’s ratio, density, acoustic impedance and Lame impedance.