鄂尔多斯盆地西仁沟地区长2低渗储层特征研究  

Characteristics of low permeability reservoir of Chang 2 reservoir in Xirengou area, Ordos Basin

作　　者：高潮 孙兵华 孙建博 曹成 王永飞[2] 延雄[2] 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,西安710075 [2]延长油田股份有限公司定边采油厂,陕西榆林718600

出　　处：《岩性油气藏》2014年第1期80-85,共6页Lithologic Reservoirs

基　　金：国家"863"计划项目课题"页岩气钻完井及储层评价与产能预测技术"(编号:SS2013AA061001);陕西省科技统筹创新工程项目"延长石油陆相页岩气成藏机理及资源潜力评价"(编号:2012KTZB03-03-01);延长石油(集团)有限责任公司青年基金项目"中生界页岩气井开发初期井网优化研究"(编号:YJY2012-QNJJ-12)联合资助

摘　　要：鄂尔多斯盆地西仁沟地区延长组长2储层为典型的低渗储层。针对其形成因素复杂、分布规律认识不清等问题,采取微观观察与宏观钻井统计相结合的方法,在大量铸体薄片、扫描电镜、物性及钻井等资料分析的基础上,对该区长2储层砂岩的沉积特征、岩石学特征、孔渗特征、成岩作用类型、孔隙类型及孔隙结构等进行了深入研究。结果表明:形成于分流河道沉积背景下的长2储层砂岩具有沉积物粒度偏细、成熟度较低的岩石学特征,储集空间主要为原生粒间孔隙和次生溶蚀孔隙,圈闭类型主要为构造-岩性圈闭;大量发育的泥质和钙质夹层造成油水纵向分异程度较差,并进一步分隔油层,使单油层层内非均质性增强。总体上西仁沟地区长2储层的宏观展布受局部构造、储层岩性和物性的综合控制,对优质储层的展布具有重要的影响。Chang 2 reservoir in Xirengou area is typical low permeability reservoir. The sedimentary characteristics, lithology characteristics, reservoir properties, diagenesis types, pore texture and pore types of Chang 2 reservoir in Xirengou area were studied through analyzing the core, thin sections, scanning electronic microscope and physical properties. The result shows that Chang 2 reservoir developed in distributary channel has the characteristics of ultra fined grain size of the deposits and low maturity, the pore types are mainly primary intergranular pores and secondary d issolved pores, and structural-lithologic trap is the main type of traps. A large number of arenopelitic and calcarenaceous interlayer that developed in the reservoir led to poor vertical differentiation of oil and water, and further separated reservoir, which makes the in layer heterogeneity become stronger in single oil reservoir. The macro distribution of Chang 2 reservoir is controlled by local structure, reservoir lithology and physical properties.

关 键 词：低渗透 成岩作用 非均质性 鄂尔多斯盆地 

分 类 号：P618.130.2[天文地球—矿床学]