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岩性控制是陕甘宁地区影响油气贮集的一个基本因素,这已经为相当数量的勘探工作所证实。因此如何研究岩性的变化——哪怕是较为宏观的变化就成为勘探工作中一个值得十分重视的问题。应用岩层物性参数是研究岩性的一个重要途径。在地震勘探中有人认为在有利条件下,如果能使求取速度的精度达到0.5％,则能鉴別大的岩性层段如厚层灰岩,而更高的精度(0.1～0.3％)时则可提供详尽岩性资料如有利地区的有用小层段上砂岩百分含量。所以在提高地震记录的信噪比的基础上设法大力提高求取速度参数的精度的工作应予以重视。然而速度远非是唯一可以应用的参数,根据大量的物性实验的研究,认为在找油找煤中常遇到的弱胶结沉积岩(如海相的砂质泥岩、砂砾及致密粘土等)和
Lithological control is a fundamental factor influencing oil and gas storage in the Shaanxi-Gansu-Ningxia region, which has been confirmed by a considerable amount of exploration work. Therefore, how to study the change of lithology - even a relatively macroscopic change has become a worthy issue in exploration work. The application of petrophysical parameters is an important way to study lithology. In seismic prospecting, some people think that if the precision of seeking speed can reach 0.5% under favorable conditions, then large lithologic intervals such as thick limestone can be identified, while when the accuracy is higher (0.1 ~ 0.3%), Provides detailed lithology information such as the percentage of sandstone available on useful small intervals in favorable areas. Therefore, on the basis of improving signal-to-noise ratio of seismic records, efforts should be made to greatly improve the accuracy of obtaining speed parameters. However, the rate is far from being the only parameter that can be applied. According to a large number of physical experiments, we believe that weakly cemented sedimentary rocks (such as sandy mudstone, grit and tight clay in the marine facies)