子北油田理801井区长6油层组储层特征及影响因素分析  

RESERVOIR CHARACTERISTICS OF CHANG 6 FORMATION IN LI 801 WELL BLOCK OF ZIBEI OILFIELD AND ITS INFLUENCING FACTORS

作　　者：葛宏选 梁小兵 赵鹏飞 赵倩 温敏[2] 沙帆[2] 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院 [2]延长油田股份有限公司子北采油厂勘探开发研究所

出　　处：《天然气勘探与开发》2014年第1期25-29,96-97,共5页Natural Gas Exploration and Development

基　　金：陕西省科技统筹创新工程课题"延长油田主力油层小型矿场先导性试验与示范工程"(2011KTZB01-04-06)

摘　　要：通过岩心观察,利用铸体薄片、扫描电镜、图像分析、压汞资料分析、数理统计以及岩心描述等方法,对子北油田理801井区长6油层组油藏储层特征进行研究。结果认为,长6油层组储层属超低渗储层,储层孔隙类型主要以粒间孔和长石溶孔为主;储集能力主要受沉积微相展布规律和成岩作用控制,该区局部发育的微裂缝,且微裂缝的含量与平均渗透率呈正相关性,对改善储层物性起到重要作用;储集性能以水下分流河道砂体物性最好,垂向上演化受成岩作用控制,压实和胶结作用使储层物性明显变差,溶蚀作用产生的次生孔隙改善储层物性,形成有效储层;本区长6油层组储层主要以IVa类储层为主。A plenty of methods,such as core observation,casting thin- section analysis,electronic microscope scanning,imaging analysis,mercury- injection data,mathematical statistics,and core description,have been applied to studying the reservoir characteristics of Chang 6 Formation in Li 801 well block,Zibei oilfield. Results show that( 1) this reservoir belongs to an ultra- low permeability one,and its porous types mainly include intergranular pore and feldspar dissolution pore;( 2) its reservoir capacity is controlled by distribution of depositional microfacies and diagenesis,and some microfactures are developed in the part area,which their content and average permeability are a positive correlation. These microfactures are conducive to improving many physical properties of reservoir;( 3)for the underwater distributary channel sandbody,its physical properties are the best. And it is vertically affected by diagenesis: both compaction and cementation making its physical property worse evidently,and secondary pores generated from dissolution being able to improving the property,which results in forming an effective reservoir; and( 4) the Chang 6 Formation is oriented by IVa type.

关 键 词：鄂尔多斯盆地 岩石学特征 孔隙结构 物性特征 成岩作用 

分 类 号：P618.13[天文地球—矿床学]