辫状河心滩内部非均质性及对剩余油分布的影响  

Inner heterogeneity within braided bar of braided river reservoir and its influence on remaining oil distribution

作　　者：杨少春[1] 赵晓东[1,2] 钟思瑛[3] 刘金华[3] 魏晓晴 李媛媛[5] 刘桓 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石油冀东油田分公司勘探开发研究院,河北唐山064300 [3]中国石化江苏油田分公司地质科学研究院,江苏扬州225009 [4]中国石油大庆油田分公司第三采油厂,黑龙江大庆163113 [5]中国地质大学长城学院工程技术系,河北保定071000 [6]中国石油川庆钻探工程公司井下作业公司,四川成都610051

出　　处：《中南大学学报（自然科学版）》2015年第3期1066-1074,共9页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2011ZX05009-003);中央高校基本科研业务费专项资金(13CX06013A)~~

摘　　要：辫状河心滩是油气富集的重要储层之一,注水开发会影响并改变心滩内部剩余油分布形式,储层非均质性是影响心滩内部剩余油分布的关键地质因素。以江苏真武油田三垛组一段6砂组辫状河心滩为例,利用岩心观察、岩心分析和测井曲线资料,结合现代沉积考察,平面上将心滩分为滩头、滩尾、滩翼和滩中等4个部分,垂向上将心滩序列划分出垂向加积体、落淤层、侧向加积体、垂向加积面和侧向加积面等5种结构,认为"三体两面"为心滩垂向序列的典型内部结构,落淤层和侧积体是影响心滩内部存在较强非均质性的主要因素。其中,落淤层主要发育泥质、钙质和物性等3种类型,是心滩内部非均质性的主控因素;侧积体与围岩性质差异较大,侧积体的存在加剧心滩内部的非均质性。心滩内部非均质性控制着剩余油的分布,落淤层发育的滩尾、滩中和侧积体发育的滩翼剩余油较为富集,而注采井和落淤层的匹配程度对剩余油的分布也起着重要的影响作用,建议注水井应该分布在心滩的滩头位置,而采油井应在心滩的滩尾、滩中和滩翼位置。Braided bar of braided river is one of the important oil and gas enrichment reservoir, whose distribution form of remaining oil can be influenced by water injection, and reservoir heterogeneity is the key geological factor influencing the distribution of remaining oil. Ta^g braided bar of 6 sand group in member one of Sanduo formation in Jiangsu Zhenwu oilfield as a case, based on the analysis of the core observation, core data and the logging data, in combination with modem sedimentary research, the braided bar can be divided into four parts including bar head, bar tail, bar limbs and bar middle in the horizon, and it can also be divided into five parts including the vertical accretion body, the off silt layers, the lateral accretion body, the vertical accretion surface and the lateral accretion surface in the vertical. ＂Three-body and two-surface＂ is considered as the typical inner structure of braided bar in the vertical, and the off silt layers and the lateral accretion body are the main factors that influence inner strong heterogeneity of braided bar. Then, three types of the off silt layers of muddy, calcium and muddy gravel are found in the formation, which are the main controlling factors of inner heterogeneity within braided bar. The lateral accretion body is quite different from surrounding rock, the existence of which exacerbates inner heterogeneity within braided bar. The distribution of remaining oil is controlled by inner heterogeneity of braided bar, and remaining oil is enriched where the off silt layers develop such as bar tail, bar middle and bar limbs with lateral accretion body. Besides, the matching degree of injection wells and the off silt layers also plays an important role in the remaining oil distribution. It is suggested that the injection wells should be distributed in the bar head, and production wells should be distributed in the bar tail, bar middle and bar limbs.

关 键 词：真武油田 心滩 内部结构 非均质性 剩余油 

分 类 号：TN971[电子电信—信号与信息处理]