鄂尔多斯盆地延长组长9油层组沉积特征  

The sedimentation during Chang 9 oil formation in Yanchang formation,Ordos Basin

作　　者：朱静[1,2] 朱亚军 辛红刚[4,2] 李文厚[1] 李廷艳[4,2] 

机构地区：[1]西北大学地质学系,陕西西安710069 [2]长庆油田分公司低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]长庆油田分公司苏里格气田研究中心,陕西西安710021 [4]长庆油田分公司勘探开发研究院,陕西西安710021

出　　处：《西北大学学报（自然科学版）》2013年第1期93-100,共8页Journal of Northwest University（Natural Science Edition）

基　　金：国家重点基础研究发展计划基金资助项目(2003CB214603)

摘　　要：目的对鄂尔多斯盆地长9的沉积背景、湖岸线位置、沉积相及砂体展布规律展开深入剖析。方法通过野剖面、钻井剖面和岩心观察,结合分析测试及测井资料进行详细的沉积特征分析。结果长9期鄂尔多斯盆地为一西南陡、东北缓、总体向东南开口的不对称湖盆,长92—长91期沉积中心由东南向西北逐渐迁移,晚期发育的长91与长92具有较好的继承性;首次湖侵期,长9油层组沉积格局以发育三角洲—半深湖相为特征,砂体十分发育,各个三角洲雏形为延长期三角洲的发育奠定了基础。结论长9期盆地四周均有砂体发育,局部地区油层发育,展现出良好的勘探前景。Aim To study the depositional setting, lake strandline, distribution rule of sedimentary facies and sand body. Methods Based on the study to the outcrop section, well core section and observation of core, data test as well as logging data analysis is done upon the sedimentary characteris tics particularly. Results Ordos Basin is a southeast opening lake basin in Chang 9, in which the southwest is stiff, the northeast is smooth, the depocenter moves from southeast to northwest in the period of Chang 92--Chang 91, the Chang 91 succeeds the Chang 92 well ; the depositional pattern during Chang 9 oil formation, the first lacustrine transgression period, is characterized by delta-half-deep lake facies, sand body developed well, and the prototypes of delta are the basis of the delta devel- oped in Yanchang period. Conclusion The sand body is found in all the basin of Chang 9 formation, and in some area, the oil layer is developed. All those show good prospects in exploration.

关 键 词：鄂尔多斯盆地 延长组长9 湖侵期 湖岸线 沉积相 沉积中心 

分 类 号：P512.2[天文地球—地质学]