鄂尔多斯盆地西仁沟地区长 2 低渗储层特征研究
网络出版日期: 2014-02-05
基金资助
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)和延长石油(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
Characteristics of low permeability reservoir of Chang 2 reservoir in Xirengou area, Ordos Basin
Online published: 2014-02-05
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。
齐亚林 , 尹鹏 , 张东阳 , 李继宏 , 卢伟 , 白嫦娥 . 鄂尔多斯盆地西仁沟地区长 2 低渗储层特征研究[J]. 岩性油气藏, 2014 , 26(1) : 80 -85 . DOI: 10.3969/j.issn.1673-8926.2014.01.012
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.
Key words: diagenetic facies; formation fluid; cements; Yanchang Formation; Ordos Basin
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