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.

Key words: Turkmenistan, Amu Darya right bank, Callovian-Oxfordian formation, formation, reef, forward, modeling, seismic response