摘要
济阳坳陷利津洼陷北部利563块沙四上段发育厚层砂砾岩储层。基于岩心、测录井数据和储层微观观察等,明确了储层异常高孔渗带的存在及其形成机制。研究表明:2500~2900 m深度范围内异常高孔渗带特征显著;异常高孔渗带成因机制有石油早期侵入、异常高压作用、溶蚀孔隙和压裂缝的发育等。储层粒间及压裂缝中沥青质的残余说明石油早期侵入;泥岩声波时差曲线的异常高值说明异常高压的存在。岩心和薄片观察揭示研究区砾石中压裂缝广泛存在,并显著提升了储层渗透率。储层溶蚀面孔率整体为2%左右,压裂缝发育基础上的溶蚀扩缝作用可有效提高储层孔隙度。
Thick layers of sandy conglomerate reservoirs are distributed in the upper part of the Fourth Member of Shahejie Formation in Li-563 area,the northern Lijin Sag of Jiyang Depression.Based on the data of cores,logging,rock microscopic feature and physical property,the paper reveals the existence of anomalous porosity-permeability zone and its formation mechanism.The study finds that it is remarkable for the feature of anomalous porosity-permeability zone among the interal of 2,500-2,900 m.The formation mechanism of the anomalous porosity-permeability zone includes the petroleum emplacement in early time,anomalously higher pressure,dissolution pores and mechanical compaction fissures.The remaining bitumen among intergranular spaces and fissures indicates early petroleum emplacement.Anomalously higher values of interval transit time logging indicate the strata′s anomalously higher pressure.The observation of cores and thin sections reveals that the extensive existence of mechanical compaction fissures improves reservoirs′permeability remarkably.Surface porosity of dissolution pores is around 2%,and fissures′enlargement promoted by dissolution improves the reservoir porosity effectively.
作者
徐宁宁
王永诗
张守鹏
邱隆伟
蒋伟
王欣
XU Ningning;WANG Yongshi;ZHANG Shoupeng;QIU Longwei;JIANG Wei;WANG Xin(Postdoctoral Scientific Research Station,Shengli Oilfield Company Ltd.,SINOPEC,Dongying 257000,China;Shengli Oilfield Company Ltd.,SINOPEC,Dongying 257000,China;School of Geosciences,China University of Petroleum,Qingdao 266580,China;CNOOC Research Institute,Beijing 100027,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2020年第1期17-21,89,共6页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题“近岸深水粗碎屑岩沉积构型与有利储层评价”(2017ZX05009-002)
“济阳坳陷页岩油勘探开发目标评价”(2017ZX05049-004)
关键词
异常高孔带
优质储层
砂砾岩
济阳坳陷
anomalously high porosity zone
high quality reservoir
conglomerate
Jiyang Depression