鄂尔多斯盆地华庆地区长6油层组超低渗砂体成因分析

Origin of super-low permeability sand bodies of Chang 6 oil reservoir set in Huaqing area,Ordos Basin

砂质碎屑流是对"鲍玛序列"和"浊积扇"等深水沉积理论的部分否定和完善。根据野外露头、岩心观察,样品分析与测试,砂体特征分析及砂体形态描述等,认为鄂尔多斯盆地华庆地区长6油层组超低渗厚层块状砂体主要为砂质碎屑流沉积,改变了传统认为湖盆中心只发育规模较小浊流沉积的观点。进一步研究认为,砂质碎屑流等深水重力流沉积主要受深水沉积坡折带控制,华庆地区长6油层组超低渗砂体属典型缓坡型砂质碎屑流沉积类型。

The theory of sandy debris flow is partial negation and improvement of deep-water sediments concepts such as Bouma sequence and turbidite fan. Based on crop, core observation, sample analysis, combined with sand body characteristics, it is considered that the sandy debris flow is the dominant sediments of Chang 6 oil reservoir set in Huaqing area, which changes the traditional concept of that there is only small-scale turbidite in the center of the lake basin. The further study suggested that the sandy debris flow is mainly controlled by deep water sedimentation slope break belt. The thick-bedded super-low permeability sand bodies of Chang 6 oil reservoir set in Huaqing area is typical gentle slope sandy debris flow sediment.