关键词: 碳酸盐岩缝洞型储层, 地球物理响应, 储层预测, 本征相干体, 裂缝强度

Abstract: Fractured and cavernous carbonate reservoir is highly heterogeneity and it is a challenge to predict reservoir distribution. Integration core observation, formation image log data and seismic data, geophysical response characteristic and prediction method of fractured and cavernous carbonate reservoir were studied in lower palaeozoic buried hill reservoir of area Z in Bohai Bay basin. Proposal reservoir prediction method is based on fracture response seismic attributes. On basis of the analysis of seismic multi-attributes, spectral decomposition, amplitude and coherence was tested. Optimized eigen coherence method based on improved linear image was applied to predict fracture and cavernous distribution of lower palaeozoic buried hill fractures, indicating the potential area for future well site deployment. Based on results of the study, a fracture and cavernous distribution prediction map and prospects were generated for the block Z area, including of well Z9, well Z37, well Z21 and well Z13 area. The fracture and cavernous are mainly distributed in north-south, north-west and nearly north-south of area Z. Prediction result fits very well with the drilling result. This methodology is a useful guidance for the same type of carbonate reservoir characterization.

Key words: fractured and cavernous carbonate reservoir, geophysical response, reservoir prediction, eigen coherence cube, fracture density