关键词: 碳酸盐岩溶洞型储层, 地球物理特性, 相干分析, 地震剖面, 波形特征, 波阻抗反演

Abstract: The anisotropic characteristics of carbonate rock cave reservoirs were distinguished by multi-phase karstification.The geophysical characteristics of cave reservoirs became more complex since different caves have different filling pattern with a little-filled,mostly filled or full-filled packs.The single factor analysis of the geological or geophysical method would lead to less success in well drilling.The integrative study on Block 11 of Tahe Oilfield shows that the generation of carbonate cave reservoirs needs to have three conventional seismic section waveform characteristics as "fracturing,reflect with a string of beads and strong wave trough".The variation ratio of seismic amplitude was obviously shown as very strong at the top of Yijanfang Group within 0～20 ms,and the absoluteness value of impedance was below 1.2×10⁷kg/m³.So the available cave and full-filled cave can be respectively identified and predicted by above three conditions.This method was proved by reservoir development practice in the cave carbonate pools of Tahe Oilfield.

Key words: carbonate cave reservoirs, geophysical characteristics, coherence analysis, seismic section, wave property, impedance conversion