基于HTI介质各向异性正演的裂缝预测属性优选

Seismic attributes optimization for fractures prediction based on the anisotropy forwarding of the HTI media

纵波方位各向异性裂缝预测方法应用较为广泛,通过对不同方位角地震数据的属性求取来拟合各向异性椭圆,从而预测储层裂缝的分布特征。为了优化目前方位各向异性裂缝预测方法应用中地震属性的求取和优选过程,提出了采用基于HTI介质的各向异性正演来实现方位各向异性椭圆拟合地震属性优选的新思路。以测井裂缝信息为基础,进行井上各向异性正演;对正演模拟道集进行各种地震属性的求取和裂缝敏感性分析;将优选出的最佳敏感属性用于各向异性椭圆拟合和裂缝分布特征预测。松辽盆地南部某地区火山岩储层的实际应用试验结果表明,基于各向异性正演优选属性的裂缝预测结果与测井裂缝信息吻合较好,验证了该方法的合理性和有效性。

P-wave azimuth anisotropy fracture prediction method is widely used to predict the distribution of fractures by fitting anisotropy ellipse based on achieving the seismic attributes with different azimuth. To optimize the calculation and choice of seismic attributes during the application of azimuthal anisotropy in fracture prediction, a new idea of anisotropy forward modeling based on HTI media is proposed. Firstly, fracture forwarding is carried out with logging curve, and then the seismic attributes are calculated based on the forward synthesis record, which is used for the sensitivity analysis of multi-attribute of fractures. The most suitable attribute is chosen to implement the anisotropy ellipse fitting and fracture prediction. The application of a certain area in the southern Songliao Basin shows that obtained distribution of fracture coincides welt with the borehole fracture information, and the method is proved reasonable and available.