鄂尔多斯盆地富县地区长8油层组高效储层形成机理  

The Formation Mechanism of High Efficient Reservoir Chang 8 in Fuxian Area of Ordos Basin

作　　者：万友利[1] 丁晓琪[1] 葛鹏莉[1] 刘志华[1] 朱莎[2] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都610059 [2]大庆油田有限责任公司第四采油厂,黑龙江大庆163511

出　　处：《石油天然气学报》2010年第6期181-185,533,共5页Journal of Oil and Gas Technology

基　　金：国家自然科学青年基金项目(40602012)

摘　　要：鄂尔多斯盆地富县地区长8油层组砂岩受沉积作用和成岩作用控制,具有粒度细、成熟度低的特征,为致密低渗透储层,但在局部区域仍发育有高效层段。以岩心观察、薄片鉴定为基础,采用扫描电镜、能谱分析、背散射等测试技术和方法,结合研究区测井曲线进行综合分析,认为富县地区长8砂岩高效储层主要控制因素包括:储集物性随粒度增大而变好,细砂岩好于粉砂岩;砂岩中泥岩岩屑、黑云母等塑性物质及碳酸盐含量对储层物性的控制作用明显;三角洲前缘水下分流河道孔隙度和渗透率最好,河口坝次之;高效储层对单砂体厚度有一定的要求;绿泥石环边发育井段的砂体储集物性远好于绿泥石环边欠发育地区。The Chang 8 Reservoir in Fuxian Area of Ordos Basin was controlled by the sedimentation and diagenesis.It had the chatacters of fine particle size and low maturity,it was a compacted sandstone reservoir with local development high-efficiency reservoir.Based on observation of drilling cores,core thin section,scanning electron microscopy,energy spectral analysis and back scatter and so on,in combination with well logging data,an integrated study is performed,it indicates that the major control factors of high-efficiency reservoir Chang 8 include:reservoir property is better with the increase of grain size,and the property of fine sand is better than aleurolite;a amount of mudstone,biotite and carbonatite have obvious effect on reservoir property;the best reservoir property is developmed in subaquatic distributary channels of the delta fronts,mouth bar takes the second place;high-efficiency reservoirs have a relationship with the thickness of sandbody;the property of reservoir where rim chlorite cement is developed is better than that of poor rim chlorite.

关 键 词：长8油层组 高效储层 形成机理 富县地区 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学]