叠前裂缝储层预测技术在三塘湖盆地的应用

The Application of Pre-stack Fractured Reservoir Prediction Technology in Santanghu Basin

三塘湖盆地重点勘探区域存在以裂缝为主的储层，经工区内主要井验证，裂缝发育程度好的地区，储层物性好。这些特征需要应用专门的裂缝研究技术对其进行预测。FRS叠前裂缝储层预测技术是以裂缝存在情况下的方位AVO属性变化、地震衰减和干涉属性理论为依据，以叠前保幅道集为基础，提取叠前方位角道集数据和多种方位角地震属性。综合地质和测井信息，进行横波测井曲线反演，建立关键井岩石物理模型。应用岩石物理正演模拟技术验证该区是否存在裂缝及裂缝产生的地震响应特征，指导多种叠前方位角地震属性预测裂缝走向与密度的研究工作。通过预测结果与测井获得的裂缝相比较，选择合适的叠前方位角地震属性对该区域裂缝储层进行精细刻画，可确定裂缝的走向和密度，并为该区油气勘探指明了有利目标区。

In key exploration regions in Santanghu Basin, fractured reservoirs are developed. Main wells in work area prove that, the formations with fractures developed have good reservoir properties. So we should apply special fracture research technology to study it. On the theory basis of azimuth AVO attribute, seismic attenuation and interference attribute with fractures existing and based on pre-stack amplitude preserving gathers, FRS pre-stack fractured reservoir predication technology could be applied to pick up pre-stack azimuth gather data and various azimuth seismic attributes. By combining geologic and logging information, through S-wave logging curve inversion, rock geophysical model in key wells may be built. Rock physical forward modeling may be conducted to verify whether this area exists fractures and seismic response features produced by fractures and guide various pre-stack azimuth seismic attributes to predict fracture trend and density. The results are compared with fractures from logging. Suitable pre-stack azimuth seismic attributes are selected to make fine description for fractured reservoir in this region, determine fracture trend and density and point out favorable targets of oil and gas exploration.