基于三角洲复合砂体构型的流动单元划分及剩余油分布模式  

Flow-unit Classification Based on Compound Sand-Body Architecture of Delta and Distribution Pattern of Remaining Oil

作　　者：袁丙龙 张辉 叶青 张连枝 陈之贺 晁彩霞 董德喜 郇金来 YUAN BingLong;ZHANG Hui;YE Qing;ZHANG LianZhi;CHEN ZhiHe;CHAO CaiXia;DONG DeXi;HUAN JinLai(Zhanjiang Branch of CNOOC China Co.Ltd.,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司研究院,广东湛江524057

出　　处：《沉积学报》2021年第5期1253-1263,共11页Acta Sedimentologica Sinica

基　　金：中海石油(中国)有限公司重大专项(CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ)。

摘　　要：以涠西南凹陷W油田为例,为加深对储层非均质性的认识,开展了基于复合砂体构型的流动单元研究,总结了剩余油分布模式。基于油田稀井网资料,通过井震结合、动静结合,并参考类似储层地质知识库特点,开展了复合砂体构型解剖;利用筛选的孔隙度、渗透率和流动带指数(FZI)把研究区储层分为四类流动单元,并在复合砂体内部刻画了流动单元的分布,总结了其分布规律。研究认为:研究区三角洲前缘复合砂体内部结构复杂,复合砂体构型、流动单元、断层等地质因素对油田水淹特征及剩余油分布影响较大,并深入分析了调整井水淹层的水淹特征,总结出了受流动单元主控的“差异驱替控油模式”、受流动单元与隔夹层共控的“复合遮挡控油模式”和受流动单元与断层共控的“断储联合控油模式”3种主要剩余油分布模式。研究成果为油田挖潜提供了重要参考。Flow-unit classification in an example of compound sand-body architecture was carried out in a delta in the W oilfield,Weixinan Sag,Beibuwan Basin to further describe reservoir heterogeneity and also to summarize the remaining oil distribution pattern. Combining well logging,seismic,production dynamics and a geological knowledge database with similar sedimentary characteristics,the compound sand-body architecture was analyzed using sparse well network data in W oilfield. The porosity,permeability and flow-zone index were adopted to divide the reservoir into four types of flow units. Their distribution was well described within compound sand-body architecture constraints,and their distribution pattern was summarized. The study revealed a complex internal architecture for the delta front compound sand-body for W oilfield in the third member of the Weizhou Formation. Geological factors(compound sand-body architecture,flow units and faults)had significant influence on the flooding characteristics and the distribution of remaining oil. In-depth analysis of the waterlogged properties of the water-flooded zone of the adjustment wells revealed three main distribution patterns of the remaining oil:(ⅰ)differential displacement patterns due mainly to flow units only;(ⅱ)complex blocking patterns controlled by flow units combined with mud interlayers;and(ⅲ)fault-flow unit patterns controlled by flow units and faults. These results provide an important reference for tapping the full potential of the oilfield.

关 键 词：涠西南凹陷 浅水三角洲 复合砂体构型 流动单元 剩余油分布模式 

分 类 号：P744.4[天文地球—海洋科学]