| 鄂尔多斯盆地延长组高自然伽马砂岩储层特征 |
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| 引用本文： | 张小莉,冯乔,孙佩,李渭.鄂尔多斯盆地延长组高自然伽马砂岩储层特征[J].地球物理学报,2010,53(1):205-213. |
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| 作者姓名： | 张小莉 冯乔 孙佩 李渭 |
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| 作者单位： | 1.西北大学大陆动力学国家重点实验室/西北大学地质学系,西安 710069;2.山东科技大学地球信息科学与工程学院，青岛 266510 |
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| 基金项目： | "十一五"国家科技支撑计划，"十一五"国家863计划，以及陕西省重点学科"地球探测与信息技术"建设项目共同资助 |
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| 摘 要： | 鄂尔多斯盆地延长组岩芯分析与测井特征研究表明，相对高自然伽马砂岩具有高长石、高Th、局部高U、K含量变化不大的共同特征，Th、U含量特征与凝灰岩极为相似；相对高自然伽马砂岩具有相对高自然伽马、高声波时差、低电阻率值的测井曲线特征，与凝灰岩测井曲线特征也极其相似；再者，从长6到长4+5油层组的各亚组，凝灰岩层逐渐不发育的同时，伴随相对高自然伽马砂岩发育程度依次增强；上述3项特征预示着延长组相对高自然伽马砂岩可能为同沉积期或较先期沉积的凝灰岩经搬运后作为砂岩组成部分再沉积形成的.四性关系研究表明：（1）依据自然伽马-自然电位曲线重叠图、声波时差-自然电位曲线重叠图，可快速识别相对高自然伽马砂岩；（2）相对高自然伽马砂岩具有相对发育的次生孔隙，非均质性强，一般物性越好，声波时差-自然电位曲线重叠图幅度差越大；（3）计算自然电位-自然电位曲线重叠图的幅度差，反映相对高自然伽马砂岩含油性，幅度差越大，表明其含油性越好.
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| 关 键 词： | 高自然伽马砂岩 储层 凝灰岩 测井曲线 四性关系 重叠图幅度差 |
| 收稿时间： | 2009-03-11 |
| 修稿时间： | 2009-11-29 |
Characteristics of high gamma ray reservoir of Yanchang formation in Ordos basin |
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| ZHANG Xiao-Li,FENG Qiao,SUN Pei,LI Wei.Characteristics of high gamma ray reservoir of Yanchang formation in Ordos basin[J].Chinese Journal of Geophysics,2010,53(1):205-213. |
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| Authors: | ZHANG Xiao-Li FENG Qiao SUN Pei LI Wei |
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| Institution: | 1.State Key Laboratory for Continental Dynamics/Department of Geology, Northwest University, Xi′an 710069, China;2.College of Geological Science & Engineering, Shandong University of Science and Technology, Qingdao 266510, China |
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| Abstract: | On the basis of geological analysis and well log interpretation, the characteristics of high gamma ray reservoir of Yanchang formation are analyzed. The results show that high gamma ray reservoir has higher content of feldspar, thorium (Th), uranium (U) and nearly constant content of potassium (K). The characteristics of Th and U contents are just like the ruffs. Second, the results show that the development degree of high gamma ray reservoir increases from Chang6 formation to Chang 4+5 formation, while the development of tufts becomes weaker. Thirdly, the well log curve characteristics of higher gamma ray, higher acoustical slowness and lower resistivity for high gamma ray reservoir are just like the turfs. The three characteristics indicate that the characteristics of higher gamma ray might be caused by homochronous sedimentary volcano tuff ash or previous tuffs. The research results about the four-property relationships of high gamma ray reservoir show that: (1) high gamma ray reservoir can be identified by the overlap of gamma ray and spontaneous potential curves, overlap of acoustic curve and spontaneous potential curve; (2) high gamma ray reservoirs have the preferable secondary pores with strong heterogeneity; the better the physical properties are, the more obvious the differential amplitude of overlap of acoustic curve and spontaneous potential curve is; (3) the computation of differential amplitude of overlap of spontaneous potential curve and spontaneous potential curve can reveal the characteristics of reservoir oil-bearing. If the differential amplitude of overlap is obvious, the oil-bearing characteristic is better. |
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| Keywords: | High gamma ray reservoir Reservoir Tuff Well log curve Four-property relationships Differential amplitude of overlap |
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