深水浊积水道储层构型叠置关系定量表征探索

Quantitative Characterization of the Reservoir Structural Stacking Relationship in the Deep-water Turbidite Channel

李晨曦 王亚青 杨希濮 卜范青 段瑞凯

LI Chenxi WANG Yaqing YANG Xipu BU Fanqing DUAN Ruikai

中海油研究总院有限责任公司, 北京 朝阳 100028

CNOOC Research Institute Co. Ltd., Chaoyang, Beijing 100028, China

为精细刻画深水浊积复合水道砂体内部单一水道砂体之间的叠置关系，对尼日尔盆地AKPO油田Z油藏开展了定量表征的探索。研究发现，深水浊积水道储层单一水道砂体间不同的叠置关系可以采用“叠置比例”参数进行定量表征，该参数可进一步细分为垂向叠置比例和侧向叠置比例；单一水道砂体间的叠置比例与其所在的复合水道砂体弯度存在一定的相关性，而水道弯度与所在盆地坡度、物源供给等地质因素高度相关；单一水道砂体间的叠置比例与复合砂体内部的连通性存在相关性，且可拟合“连通系数”作为判断储层内部连通性的参考。研究表明，叠置比例是重要的桥梁，可在砂体叠置样式、形态与储层连通性、开发效果间建立数学联系，是开展深水浊积砂体精细表征和数字化研究的有效手段之一。

In order to accurately describe the superposition relationship between individual water channels within the sand body of deep-water turbidite composite channels, we made a quantitative study on Reservoir Z in the AKPO Oilfield in the Niger Basin. The study showed that the various stacking relationships between single sand bodies in deep-water turbidite reservoirs can be quantitatively characterized by the “stacking ratio” parameter. This parameter can be further divided into a vertical stacking ratio and a lateral stacking ratio. There is a certain correlation between the stacking ratio of sand bodies of an individual channel and the camber curvature of the composite channel. In addition, the channel curvature is highly correlated with geological factors such as the slope of the basin and material resource supply. The stacking ratio of sand bodies of an individual channel is correlated to the interior connectivity of the composite sand body, and can be used as a reference for judging the internal connectivity of the reservoir when combined with the ”connectivity coefficient”. This study found that the stacking ratio is an important link. It can be used to build a mathematical connection between the stacking pattern and the morphology of sand bodies, with reservoir connectivity and development effect. It is one of the most effective means of fine characterization and digitization research of deep-water turbidite sand bodies.

10.11885/j.issn.1674-5086.2019.01.31.01