【摘要】 以四川盆地焦石坝地区为例,通过岩心含气量与地球物理参数交会分析,找到含气量敏感地球物理参数—密度,并建立含气量与密度之间的数学模型,得到计算含气量的经验公式。结合叠前反演获得的密度体便可计算出含气量数据体,从而达到定量预测页岩含气量的目的。结果表明,通过叠前密度反演可实现该区页岩含气量的定量预测,而且精度较高,同时指出五峰组—龙马溪组一段底部含气量最高,可作为勘探开发的首选层段。更多还原

【Abstract】 We propose in this paper a shale gas content prediction approach.We first analyze gas content of core in Jiaoshiba area,Sichuan Basin,and analyze measured gas content vs geophysical parameters.We find that density is sensitive to gas content.Then we establish an optimal fitting equation between density and gas content,and obtain an empirical formula for calculating gas content.After that we calculate gas content volume based on the density volume from prestack seismic inversion.Finally we predict quantitatively gas content.Our application shows that shale gas content can be quantitatively predicted based on density of prestack inversion.We also find out that the bottom of Wufeng-Longmaxi formation in the area has the highest gas content,which might be a prime target for the future exploration.更多还原