深水浊积水道砂体内部渗流屏障发育规律研究

A Study on the Development of Sand-body Flow Barriers in Deep-water Turbidity Channels

李晨曦 苑志旺 杨希濮 卜范青 赵晓明

LIChenxi YUANZhiwang YANGXipu BUFanqing ZHAOXiaoming

中海油研究总院有限责任公司, 北京 朝阳 100028 西南石油大学地球科学与技术学院, 四川 成都 610500

CNOOC Research Institute Co. Ltd., Chaoyang, Beijing 100028, China School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

深水浊积砂体受成因影响，侧向变化往往十分迅速，使得储层内部的连通性较为复杂。在深水油田的开发实践中，发现影响连通性的主要因素中，渗流屏障起到非常重要的作用，同时也影响了井间的注水受效模式。对于深水浊积水道砂体沉积而言，如何刻画储层内部即单一水道间的渗流屏障，表征砂体连通性，用以指导后续的井位优化、提高注入水波及效率，是值得研究的课题。综合应用甘南地区重力流沉积露头、尼日利亚AKPO油田某Z油组测井、地震及生产数据，分析渗流屏障的成因机制，对复合水道砂体内部渗流屏障的分布进行刻画，并分析其对注水受效情况的影响。研究发现，对于井下的注采井对，影响砂体连通的渗流屏障主要呈现散点式、线段式和复合点段式，受渗流屏障的影响，注采受效呈现直线式、波动式和散射式，不同的样式下，采油井的含水上升规律也存在差异。

Deep-water turbidites, due to their genesis, often display dramatic lateral variations, which makes the internal connectivity of the reservoir relatively complex. In deep-water exploration, flow barriers play a very important role in not only connectivity, along with other main factors, but also in effects of water injection between wells. Therefore, it is important to study how to depict flow barriers inside a reservoir between channels, and to characterize connectivity within a sand-body to optimize well locations and improve efficiency of water injection. Through a comprehensive study of the outcrops of gravity flow in the Gannan Area of China, along with logging, seismic, and production data of the Z group in the AKPO Oilfield in Nigeria, we analyze the formation of flow barriers, their distribution within sand bodies in complex water channels, and their effects on water injection. The results show that, for the injection and production well pairs, flow barriers that affect the sand-body connectivity exist in scatter, linear, and composite patterns. The patterns of the effects of injection and production can be linear, wavy, and scattering; the increase in water cut also differs in production wells of different injection and production patterns.

10.11885/j.issn.1674-5086.2018.10.11.01