基于储层构型研究的储层平面非均质性表征

密闭取芯以及大量加密调整井实钻显示，渤海SZ油田平面上水淹差异大，平面剩余油动用不均，而现行平面非均质性定量表征手段难以满足下一步挖潜需求，基于减缓平面矛盾、释放平面剩余油潜力需求，开展了渤海SZ油田开发后期储层平面非均质性表征研究。研究显示，现行平面非均质性定量表征以地质统计学方法为主，其基础参数多为井眼处储层指标信息、以小层为测量单元，存在表征层次不足、无法有效描述井间储层内部结构差异等问题，通过开展储层构型研究，深化储层平面非均质性程度表征层次，结合油田不同相带单元平面油水接触关系，统计了储层平面非均质性定量表征新指标非连通厚度，该指标以连井剖面为基本单元，克服了无法描述井间储层内部结构差异的局限，并通过绘制非连通厚度平面分布图，实现了储层内部结构差异程度半定量表征。将非连通厚度指标应用于渤海SZ油田小井距先导试验，指标预测结果与生产实际一致，应用效果良好。

Reservoir Plane Heterogeneity Characterization Based on Reservoir Architecture Research

As shown by coring and drilling data from numerous infill and regulation wells, significant differences in water flooding have occurred along the plane of the Bohai Sea SZ Oilfield, and there has been uneven utilization of the plane residual oil. Current methods for quantitatively characterizing plane heterogeneity are insufficient for satisfying future exploitation demands. To mitigate plane differences and realize plane residual oil potential, research characterizing reservoir plane heterogeneities was conducted during the late exploitation stage in the Bohai Sea SZ Oilfield. The results indicate that current quantitative methods for this type of characterization have been primarily based on geostatistics, with fundamental parameters, i.e., reservoir indices, obtained from wells. Because they are measured in small individual layers, they can neither sufficiently present all different properties nor effectively describe issues, such as internal structural differences in reservoir layers between wells. By examining reservoir architecture, a more comprehensive characterization of reservoir plane heterogeneity is achieved. This is integrated with plane oil-water contact relationships in different facies units in the oilfield to obtain a new quantitative characterization index and non-connected thickness, for heterogeneous layers. This index uses well profiles as basic units, thus overcoming the limitation that internal structural differences in reservoir layers between wells are not depicted. Furthermore, plotting a plane distribution map of unconnected thicknesses provides a mechanism for semi-quantitatively characterizing internal structural differences in reservoir layers. The non-thickness index is applied to closely spaced wells in the Bohai Sea SZ Oilfield in a pilot test. The predictions based on the index are consistent with the actual production results, suggesting that the index is practically applicable.