通过地层沉积过程进行储集层的精细描述

Fine reservoir description by analysis of strati-graphic deposition procedure

应用高分辨率层序地层学理论分析萨尔图油田中部北一区断东西块葡Ⅰ油层组的地层沉积过程,发现当地层沉积于基准面上升半旋回时,河道砂体的宽度与厚度、储集层的孔隙度与渗透率减少,而保存沉积相的多样性增加,非河道流动单元类型增多,流动单元间的连通性变差;而当地层沉积于基准面下降半旋回时,储集层的所有属性与上升半旋回的变化完全相反。通过对地层沉积过程的分析,可以表征和预测储集层的各种属性,从而表征大庆油田开发老区的层内非均质性。

High-resolution sequence stratigraphy could be used as a guidance to study the base-level of the Pu I reservoir of West Block, East Fault Block, North Area 1, central Saertu Oilfield. The results suggest that when base-level (A/S) rose, the width, thickness, porosity and permeability of the reservoir decreased, while the variety of deposition facies and the type of non-river flow units increased, and connectivity of flow units decreased. When base-level is in the falling stratigraphic procedure, all the physical properties of these reservoirs changed in the opposite direction to the rising procedure. The different geologic properties of the reservoir can be described and forecasted on the basis of the stratigraphic procedure. And the heterogeneous nature of the Daqing Oilfield developed blocks can be described clearly.