【摘要】 依据阿姆河右岸AS区块上侏罗统卡洛夫-牛津组不同岩性段的地质特征和电性特征,建立了生物礁的地质模型,通过波动方程正演模拟生物礁模型的地震响应。研究区生物礁模型正演的地震响应特征为丘形和透镜状反射,礁的边缘反射波常出现上超及绕射地震反射现象,反射波有向上穹隆冲顶现象,生物礁顶部反射波为波谷弱反射,振幅变弱,波形不连续;生物礁反射波内部为杂乱或者弱反射,反射波的振幅、频率和相位的连续性与围岩有较大的差异,生物礁内部与两翼地层相比,反射波反映的厚度明显增大。这与本区含生物礁井的过井地震剖面特征一致,从而可根据生物礁正演模拟结果识别生物礁的地震特征并建立生物礁识别模式。更多还原

【Abstract】 Based on the geologic characteristics and electric feature in different litholigic intervals of Callovian-Oxfordian formation of the Upper Jurassic in AS Block of the Amu Darya right bank in Turkmenistan,a reef geological model is developed,and the seismic response of this model is simulated by wave equation forward modeling method,showing that the seismic response of reef in the area characterized by mound-shaped and lenticular reflections,and the reef edges often appear on onlap and difffraction phenomena,with dome hoisting,weak reflection,weaker amplitude and discontinuous waveform.Such messy or weak internal reflections cause the great differences between the reflected wave amplitude,frequency,phase continuity and those of surrounding rocks,the thickness of the inside is obviously greater than that of both sides of reef.These characteristics are consistent with seismic profile characteristics of reef over wells,so the seismic-identified characteristics and patterns of the reefs can be recognized and developed using forward modeling method.更多还原