方位各向异性裂缝检测技术在牛东潜山的应用

牛东潜山带碳酸盐岩储层具有非均质性强、横向变化快的特征,该区碳酸盐岩地层以缝洞储层为主.受裂缝的影响,振幅、频率、速度等地震属性的衰减现象明显,常规地震属性分析方法对裂缝的预测精度较低.准确识别裂缝储层是该区油气勘探的关键,为此在该区开展方位各向异性裂缝预测工作.成像测井结果表明,该区主要发育高陡裂缝,符合HTI介质的...

Application of Azimuth Anisotropic Fracture Detection Technology in Niudong Buried Hill Zone

The carbonate reservoir in the Niudong buried hill are mainly fracture-cave reservoirs,with strong heterogeneity and rapid lateral change.The prediction accuracy of cracks by conventional seismic attribute analysis methods is low due to the obvious attenuation of amplitude,frequency and velocity affected by the cracks.As a result,fracture prediction of azimuthal anisotropy is carried out in this area as the accurate identification of fracture reservoirs is the key to the hydrocarbon exploration.The results of imaging logging show that steep fractures are mainly developed in the study area,which has the characteristics of HTI medium.The azimuth angle dataset is obtained by determining the offset range and dividing the four azimuth ranges,which based on the forward modeling carrying out on the longitudinal wave reflection coefficient formula.The main direction of the fracture in the study area is determined to be NE by outlining the fracture development zone combined with the orientation and density of the features,which are calculated by azimuth seismic attributes of longitudinal wave extracted by the data volume.It is proved that AUAz technology has a good practical application value for reservoir prediction of high and steep fractures in carbonate reservoir by the use of imaging logging data in actual drilling,which verified the prediction results,and obtained a good match.