Interpretation And Detection of Fracture Zones By Multi Seismic Attributes

Fractures are generally constructive to the tight sandstone and carbonate reservoirs. So fracture detection based on seismic data is one of very important tasks in reservoir characterization. However, it is more difficult to interpret the results from seismic attributes analysis to identify the meaningful fracture zones instead of the large faults and to distinguish the fractures features from noise features by seismic attributes analysis results. In order to get better interpretation and detection of fracture zones, we propose to use multi seismic attributes including edge detection attributes, volumetric curvature attributes, coherency attributes, etc. to diminish the ambiguities of seismic attributes analysis results, and to use some geological constrains including faults-associated fracture zone theory, etc. to interpret and identify the fracture feature correctly. The approaches above mentioned have been applied in the characterization of the dolomitic tight sandstone reservoirs in some basin, Western China, and the corresponding of dolomitic sandstone distribution and fracture zones gives the good information of hydrocarbon accumulation reservoirs in the area.