短期基准面旋回充填样式与储层宏观非均质性关系——以陇东地区三叠系延长组长6-长7浊积扇为例

以高分辨率层序地层学理论和技术方法为指导，以钻井、测井资料的综合研究为基础，运用短期基准面旋回界面的识别标志将陇东地区三叠系延长组浊积扇短期基准面旋回层序划分为向上“变深”非对称型、向上“变浅”非对称型和对称型3种基本结构类型。重点讨论了短期基准面旋回充填样式与储层宏观非均质性的关系，指出储层宏观非均质性变化明显受控于基准面旋回叠加样式，在低可容纳空间条件下形成的浊积砂体非均质性相对较弱．储层物性最好．而在高可容纳空间条件下形成的砂体则相反。

Relation between infilling patterns of short-term base-level cycle and macroscopic reservoir heterogeneity——taking Chang 6 to Chang 7 turbidite fan of Yanchang Formation in Longdong area as an example

Based on a comprehensive study of drilling and log data, sequences of short-term base-level cycle of turbidite fan in Yanchang Formation of Triassic in Longdong area are divided into three basic structure types: up - deepening non - symmetry, up -shallowing non ?symmetry and symmetry ones according to recognition sign of the interface of the short - term base - level cycle. These are all guided by the high - resolution sequence stratigraphy theory and technology methods. Relation between infilling patterns of the cycle and macroscopic reservoir heterogeneity is discussed as the key. Change in the macroscopic reservoir heterogeneity is controlled by stacking pattern of the base ?level cycle. Heterogeneity is relatively weak and physical properties of reservoirs are the best in the turbidite sandbody formed at the low accommodation; the sandbody formed at high accommodation is on the contrary.