横波各向异性在碳酸盐岩裂缝性储层评价中的应用

裂缝性地层一般都具有各向异性的特征.从裂缝性地层所具有的各向异性出发,根据横波在各向异性地层中传播时所导致的分裂现象,利用偶极横波成像测井资料所提取的快慢横波信息来指示地层的各向异性大小,而裂缝的密度、张开度等与裂缝的各向异性有密切的关系,从而达到识别裂缝及其有效性的目的.通过在塔里木油田轮古地区碳酸盐岩裂缝性储层中的实际应用,证实了利用横波的各向异性特征可以定性地分析裂缝的有效性,最终为寻找高产稳产井及试油决策提供一个很好的技术手段.

Application of Shear Wave Anisotropy to Evaluation of Fractured Carbonate Reservoir

Fractures in carbonate reservoir are import an t oil & gas storage space and permeable channel. The fractural effectiveness is always a difficult problem in carbonate reservoir logging evaluation. Generall y, fractured formation has characteristic of anisotropy. According to the phen omenon of the fast and slow shear wave which are divided by anisotropy formation where shear wave pass through, the degree of anisotropy can be showed by the f ast and slow wave information from DSI image data. Since the density and gaping degree of fractures are closely related with the degree of anisotropy, so the effectiveness of fractures can be evaluated. Application of shear wave ansiotro py in fractured reservoir in Lun Gu region in Tarim basin proved that the fractu re effectiveness can be qualitatively analysed using the features of shear wave division, thereby providing a good technological method for finding high produc tion wells and oil testing decision.