ABSTRACT

To solve the problem of multi-resulted in seismic responses brought by dual impacts of the thickness and the lithologic association for further research of seismic response characteristics of hydrothermal dolomite, significant efforts have been made, which were based on the study of dolomite, the Maokou formation in the eastern Sichuan Basin, to conduct an analysis of mineral composition, strata distribution and dolomitization in its area, to develop layered medium models in accordance with different dolomitization degrees and thicknesses, and to build standardized wedge models for the full display of that in binary changes. Moreover, an essential application of the pre-stack and post-stack seismic forward modeling have been performed for analyzing how different dolomitization degrees and thicknesses had influences on the seismic response characteristics of hydrothermal dolomite. Given this, the sensitive seismic attributes of the target interval in the study area have been selected preferentially by analyzing the seismic response characteristics of hydrothermal dolomite, which plays a critical role in the entire process. The results show that?1. The response characteristic of amplitude is greatly influenced by the dolomitization degree and bed thickness?2. The dolomitization degree constitutes a transformation of AVO response characteristics from II to IV, while the variation of thickness leads to a transformation of AVO response characteristics from IV to II. 3. The actual results indicate that the relative fluid factor FF is one of the most sensitive AVO attributes, and the predicted results are in par with the actual results.

摘要

针对热液白云岩地震响应特征的进一步研究，为解决厚度和岩性组合双重影响带来的地震反应多结果问题，在对茅口白云岩研究的基础上，开展了大量工作。开展川东地区矿物组成、地层分布及白云石化分析，根据不同白云石化程度和厚度开发层状介质模型，建立标准化楔形模型，充分展示二进制变化。而且，已经进行了叠前和叠后地震正演模拟的重要应用，以分析不同的白云石化程度和厚度对热液白云岩地震响应特征的影响。鉴于此，通过分析热液白云岩的地震响应特征，优先选择了研究区目标层段的敏感地震属性，这在整个过程中起着至关重要的作用。结果表明？ 1．振幅响应特性受白云石化程度和床层厚度影响较大？2．白云石化程度构成了 AVO 响应特性从 II 到 IV 的转变，而厚度的变化导致了 AVO 响应特性从 IV 到 II 的转变。3.