叠前纵波裂缝预测在平桥页岩气储层中的应用
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摘要
页岩储层裂缝发育特征是页岩气井位部署和开发的重要依据,影响单井产能。从基于HTI各向异性介质模型的椭圆拟合方法出发,在经过物性统计的基础上,正演出不同平面方位角度道集,以此为标尺,计算和标定叠前纵波裂缝预测的裂缝发育方位和强度。进一步统计分析平桥地区页岩气储层段的单井点裂缝特征,认为高导缝发育总体沿着大断裂走向,倾角接近垂直,且方向单一,非常符合HTI介质的假设。纵波裂缝预测结果与微电阻率测井解释等资料结果基本吻合,证明该方法能够较好地适用于页岩气裂缝储层预测。
As an important basis for deployment and development of shale gas well location,shale reservoir fracture growing characteristics influence single well deliverability.Starting from ellipse fitting method based on HTI anisotropic media model and according to physical property statistics,this paper determines different level azimuth trace gathers by forward modeling and calculates and demarcates fracture development azimuth and intensity of prestack longitudinal wave fracture prediction.Further statistic analysis of single-well fracture characteristics of Pingqiao shale gas reservoir interval confirms that high-guide fracture goes totally along big faults with sub-vertical dip angle and sole direction,totally agreeing with HTI media assumption.Longitudinal wave fracture prediction result basically tallies with microlog interpretation and other data,proving that this method is good at shale gas fracture reservoir prediction.
As an important basis for deployment and development of shale gas well location,shale reservoir fracture growing characteristics influence single well deliverability.Starting from ellipse fitting method based on HTI anisotropic media model and according to physical property statistics,this paper determines different level azimuth trace gathers by forward modeling and calculates and demarcates fracture development azimuth and intensity of prestack longitudinal wave fracture prediction.Further statistic analysis of single-well fracture characteristics of Pingqiao shale gas reservoir interval confirms that high-guide fracture goes totally along big faults with sub-vertical dip angle and sole direction,totally agreeing with HTI media assumption.Longitudinal wave fracture prediction result basically tallies with microlog interpretation and other data,proving that this method is good at shale gas fracture reservoir prediction.
引文
[1]邹贤军.纵波速度方位各向异性在页岩气裂缝预测中的应用[J].江汉石油职工大学学报,2016,29(1):1-4.
[2]Andreas Ruger.Variation of P wave reflectivity with offset and azimuth in anisotropic media[J].GEOPHYSICS,1998,63(3):935-947.
[3]朱培明,等.用纵波AVO数据反演储层裂缝密度参数[J].石油物探,2001,40(2):1-12.
[2]Andreas Ruger.Variation of P wave reflectivity with offset and azimuth in anisotropic media[J].GEOPHYSICS,1998,63(3):935-947.
[3]朱培明,等.用纵波AVO数据反演储层裂缝密度参数[J].石油物探,2001,40(2):1-12.