Abstract:

Seismic response properties of Ordovician carbonate rock oil pools in Lunnan Region,Tarim Basin are evidence:1.the impedance differentiae of the carbonate rocks with well developed fractures change smaller,the reflection energy decreases thus resulting in decrease of reflection amplitude;2.high frequency of the fracture developed area damp out quickly,so the reflection frequency decreases;3.if the fractures are filled with liquid,the ratio of formation absorbing seismic wave will considerably increase;4.the wave impedance of fracture fluid is much lower than that of fractures with no fluid.According to drilling statistical analysis,the coincidence rates of the first three terms are as high as 87%～90%,but the last one is only 65% since reservoir spaces are extremely heterogeneous and this effects lateral resolution.

Key words: carbonate rock, oil gas pool, amplitude, frequency, absorption ratio, wave impedance