摘要
通过对曲率属性的分析对比,寻找适合研究区的曲率,从而提高解释的精度和效率。振幅曲率与构造曲率在数学上是相互独立的,通过对地震振幅数据的二阶微分求取可以得到振幅曲率属性。针对断层以及地质异常体在常规地震剖面上表现为同相轴的变化、扭曲、振幅突变等特征,利用曲率属性上表现为线性构造,进行断层以及地质异常体的识别,同时总结了曲率属性在解释应用中应注意的问题。振幅曲率不但能反映构造特征,同时能够突出由地质因素造成的振幅差异,从而反映地质特点,对刻画地质体的轮廓、分层结构、断裂系统等非常有效。应用实例表明,曲率属性能够有效识别出断裂发育分布,利用振幅曲率断层的轨迹,沉积体边界刻画得清晰、连续,利于解释,可减少解释多解性。
Based on an analysis and contrast of seismic curvature attributes, this paper aims at finding effective curvature attributes to interpret the seismic data so as to improve the efficiency and accuracy of interpretation. The amplitude curvature attribute and structural curvature attribute are independent of each other in mathematics. The amplitude curvature attribute can be computed by the second de- rivative of seismic amplitude data. Faults and geological anomalies in general seismic section have such features as variation of the ho- mophase axis, twist, and abrupt change of the amplitude. These variations show small linear structure in the seismic horizon curvature at- tribute, so faults and geological anomalies can be interpreted according to linear structure anomaly. This paper also sums up the notable problems in the application of curvature attributes. Amplitude curvature attribute not only reflects structural characteristics but also high- lights the difference between the amplitudes of geological factors, thus demonstrating the geological features. This technique can effec- tively portray boundaries of sedimentary bodies ,hierarchical structure, and fracture system. The applications show that the utilization of amplitude curvature attributes is effective and convenient in interpreting fauhs. With this technique,the tracks of the faults and the si- zes, shapes and boundaries of sedimentary bodies become continuous and clear, and the fault interpretation becomes more easy.
出处
《物探与化探》
CAS
CSCD
2013年第5期916-920,共5页
Geophysical and Geochemical Exploration
基金
国家重大专项(2011ZX05030)
关键词
构造曲率
振幅曲率
断层解释
沉积体刻画
structural curvature
amplitude curvature
fault interpretation
sedimentary bodies interpretation
