地质学方法估算准噶尔盆地西山窑组剥蚀厚度

综合利用地层对比法和沉积速率法估算了准噶尔盆地西山窑组剥蚀厚度,用全盆地34条二维区域地震测线资料,估算了西山窑组剥蚀厚度的平面分布特征。利用单井的地质分层和精细年代格架数据,估算了西山窑组的单井剥蚀厚度。对比结果表明,两者剥蚀厚度的估算结果相近,绝对误差最大不超过50 m,相对误差在20%以内。估算结果表明,准噶尔盆地腹部西山窑组剥蚀厚度为100～400 m,且自北东向南西,剥蚀厚度逐渐增大,在南部剥蚀厚度可大于400 m。

Geological Estimation of Denuded Strata Comeback of Xishanyao Formation in Junggar Basin

Strata antithesis and sedimentary ratio analysis methods are used in the estimation of denuded strata comeback of Xishanyao Formation in Junggar basin.Strata antithesis method uses two dimension seismic data to comeback the plane distribution character of Xishanyao Formation,and sedimentary ratio analysis method uses well geological layer and precise chronology framework data to comeback well denudation thickness.The results show that these methods gain the similar denudation thickness with absolute error less than 50m,and relative error limited in 20%.The denudation thickness of Xishanyao Formation in Junggar basin varies from 100m to 400m,increases from northeast to southwest,and may reaches more than 400m in the south most of Junggar basin.