摘要
Abstract
The method that use the refection wave extracted from array acoustic logging data to image the reservoir interface,fractures and vugs near the borehole with a radial distance about tens of meters show s broad application prospect,w hich can intuitively monitor the development of fractures and identify the reservoir type.The reflection wave can be extracted from the logging data,w hich can be utilized to evaluate the geo-structure of borehole scale and identify reservoir by imaging the fractures,vugs and other reflectors through reverse time migration.Meanwhile, the height,the depth and the azimuth of hydraulic fracturing can be evaluated based on the results.T his method has been effectively applied in the oilfield of central China.T he result shows that the depth of investigation up to 30 meters with a vertical resolution of 20 centimeters. The development of fractures and vugs near the borehole can be observed intuitively based on the characteristics of different reflectors events.Generally,the reflection energy of the event for stratigraphic interface is strong and continuous,w hile it is highly curving and discontinuous for the fractures.The similar event can be found in both the reflection and seismic image for the special geologic body,such as reefs,which can refine the detail of seismic image.Moreover,the azimuth of reflectors can be determined with the method.Based on the precise extraction of high resolution reflection waves,an algorithm has been developed to suppress the influence of the pseudo-interface with an adaptive velocity model for stacking and migration,w hich greatly improves the image accuracy of reflection interface perpendicular to the borehole axis.关键词
阵列声波测井/缝洞储层/反射波成像/方位识别Key words
fractured-vuggy reservoir/array acoustic logging/reflection wave imaging/fracture orientation identification分类
天文与地球科学
