裂缝型页岩储层DHSR预测方法研究

水平应力差异比是页岩储层地应力评价的重要参数,可从应力角度有效判断出压裂有利区,在页岩储层"甜点"预测中发挥着至关重要的作用。页岩储层裂缝较为发育,因此可将裂缝型页岩储层等效为具有水平对称轴的横向各项同性介质。在此基础上,根据方位叠前反演理论,结合等效各向异性介质方位反射特征,发展了一种基于方位地震数据的页岩储层水平应力差异比预测方法。模型试算结果表明,该方法具有较好的稳定性和精度,可较为准确地预测页岩储层水平应力差异比,为页岩储层有利压裂区及"甜点"区的寻找提供依据。

DHSR Forecasting Methods Research on Fractured Shale Reservoir

Horizontal stress diversity ratio,which is a key parameter in ground stress evaluation of shale reservoir,plays an important role in the forecasting"deserts"of shale reservoir by effectively estimating fa-vorable fracture zone from the point of view of stress.A forecasting method of horizontal stress difference ratio in shale reservoir based on using azimuth seismic data is developed by the azimuth pre-stack inversion theory and integrating equivalent azimuth reflection character of anisotropic medium on the basis of regard-ing fractured shale reservoir as transversely isotropic medium with horizontal symmetry axis because it is more developed.Trial calculation of model indicates that this method has better stability and precision,and comparatively perfect forecast on the horizontal stress diversity ratio of shale reservoir,which provides evi-dence for the searching of favorable fracture zones and"deserts"zones in shale reservoir.