CAJ | 학술논문

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.
허다지진속성,비여지진적종횡파속도,박송비,성파조항,도능용래구분불동적암석류형,이용랍매조항작위진일보적약속래대체성파조항능경호적강저결과적비유일성.아문용저충방법구건료발해만지구일조부면적암석성분모형.아문간요개소료구분암석류형적지진삼수,중점재우불동적삼수조합대우분변암석류형적민감성.위료여실온상압조건하측득적유대표성적암석적지진파속도화밀도진행대비,아문수선수요주온도화압력적교정.접착,아문수요용이지자료화실험측득적각충암석양품주대비,래학정연구구적암석류형.아문수집료발중요함일조부면적종파속도자료.해부면10km심범위내적속우동충암석류형적불동암석최종통과지진파속도、박송비、밀도、성파조항、이급랍매조항종합약속.
Seismic attributes, such as P- and S-wave velocity, Poisson's ratio, and acoustic impedances, all generally can be used for distinguishing different rock types. The non-uniqueness can be largely reduced using Lame impedances instead of acoustic impedances as additional constraints. We have followed this method to constitute a petrologic composition model of the upper crust in the Bohai Bay basin, China. We briefly review the seismic parameters used for discrimination of rock types and focus our attention on the sensitivity of different combinations of parameters to determine the composition of materials. Corrections for pressure and temperature are performed in order to compare elastic wave velocities and densities measured at room temperature and surface pressure in laboratory with those for representative rock parameters. In a second step, we find the rock classes in the tested area by contrasting known data to laboratory measurements on a variety of rock samples extracted in the area. The basic field data are P-wave velocity values collected along a seismic profile conducted in the Bozhong Depression. The different rock types belonging to a particular rock class are finally constrained by the seismic velocities, Poisson's ratio, density, acoustic impedance, and Lame impedance related to the topmost 10 km of the Bohai Bay crust.