马世忠,王再山,王渝明
MA Shi zhong\+1;WANG Zai shan\+2;WANG Yu ming\+2 (1.Exploration Department of Daqing Petroleum Institute;

• 1:大庆石油学院勘探系!黑龙江安达151400
• 2:大庆油田有限责任公司第五采油厂!黑龙江大庆163513
• 3:大庆油田有限责任公司第五采油厂!黑龙江大庆163513

摘要(Abstract)：

对以往研究较少 ,并在油田勘探阶段及开发初、中期地质研究中被遗漏或忽视的决口水道的成因、沉积特征与模式、空间分布及在油田开发中的意义进行了研究与探讨。指出决口水道是在河流及三角洲沉积体系中 ,由主河道于大洪水期冲裂决口后 ,在广阔河道间形成的具有固定路径及一定限流作用的极窄、浅的短程小型水道。相当于新河道形成早期的“小型冲沟”阶段 ,其形成后对原主河流流量影响较小。其与河流沉积相比 ,具有粒度细、分选稍差、含泥量稍高、层理规模小、冲刷弱、略显正旋回、储层物性略差 ,特别是砂体极薄 ( <2 5m)而窄 ( <10 0m)等特点。建立了渐弱消失型、分枝型、末端扇型和汇入型 4种沉积模式。因其窄小分散而形成小而肥的井网控制不住型或注采不完善型剩余油富集砂体 ,又因其数目众多 ,而具有可观的剩余油储量 ,所以 ,其在油田挖潜及油田地质研究中具有重要意义。
Crevasse channel is rarely studied in the past and ignored in the earlier and middle period of geologic study of oil field exploration.This paper studies its genesis,sedimentary characteristic and pattern,spatial distribution and significance in oil field development.It indicates that crevasse channel is a kind of very narrow and shallow short range small channel with a fixed path which is formed among wide ranged channels by the major channel after the avulsion crevasse in a fluvial and deltic sedimentary system.It is equal to the earlier “small coombe” period,and is formation has little effect on the origin major fluvial flow rate.Compared with fluvial sedimentation,it has some characteristic such as fine grain size,slightly poor sorting,a bit high mud content,small bedding size,weak flush,a bit positive cycle,a little poor reservoir property,and especially very thin(<2 5 m) and narrow(<100 m) sandbody.This study constructs four sedimentary patterns including weakening vanishing type,branching type,terminal fan type and inward remittance type.It has a large amount of residual oil reserves because its narrow and scattered characteristic forms small and fat residual oil enrichment sandbody of pattern uncontrolled type and unperfected injection production type and because of its large number.Therefore it has a significance in oil field potential seeking and geologic study.

关键词(KeyWords)： 决口水道;沉积特征;沉积模式;小层沉积微相;剩余油
crevasse channel; sedimentary characteristic; sedimentary pattern; bed sedimentary micro facies; residual oil

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 马世忠,王再山,王渝明
MA Shi zhong\+1;WANG Zai shan\+2;WANG Yu ming\+2 (1.Exploration Department of Daqing Petroleum Institute;

参考文献(References)：

• [1 ]READINGHG Sedimentaryenvironmentsandfacies [M] ,secondedition .London:BlackwellScientificPublications,1 986.
• [2 ]李思田 含能源盆地沉积体系 [M] 北京 :中国地质大学出版社 ,1 996
• [3]张红薇 ,赵翰卿 泛滥 分流平原相储层中河间砂体的精细描述[J] 大庆石油地质与开发 ,1 998,1 7(4)
• [4]巢华庆 ,许运新 大庆油田持续稳产的开发技术 [J] 石油勘探与开发 ,1 997,2 4 (1 )