砂质辫状河储层构型对流体运动的控制作用
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摘要
针对开发后期流体运动规律及储集层内部剩余油分布复杂的问题,以渤海Q油田馆陶油组砂质辫状河储集层为例,根据落淤层分布样式,建立机理模型,通过数值模拟及油藏工程方法,从横向、垂向2个方面定量研究了储层构型模式对流体运动的控制作用,得到砂质辫状河储层构型模式控制系数的表达式。研究结果表明:砂质辫状河储层构型模式的横向控制作用随着落淤层的厚度、落淤层水平宽度、落淤层频率、地层倾角的增加而变强。当落淤层厚度大于10 m,垂向渗透率小于100 mD时,落淤层对流体的垂向控制作用较强,完全抑制了底水能量,不具备提液潜力;当馆陶油组落淤层厚度小于1 m,垂向渗透率大于100 mD时,落淤层在垂向上对油井生产无影响,无法抑制底水能量,容易形成底水锥进。该研究对掌握油田开发后期剩余油分布规律及增产挖潜具有重要意义,可为油田开发后期综合调整指明方向。
Due to the complex problems in fluid migration and remaining oil distribution in the late development stage,the sandy braided river reservoir of the Guantao oil group in the Bohai Q oilfield is taken to establish a mechanism model according to the fall-siltseam distribution patterns. The numerical simulation and reservoir engineering methods are used to quantitatively study the effects of reservoir configuration on fluid migration from the lateral and longitudinal directions and finally obtain the control coefficient expression of sandy braided river reservoir configuration. Research indicates that the lateral effect of sandy braided river reservoir configuration increases with the fallsiltseam thickness,lateral width,frequency and stratum dip-angle. When the siltseam thickness exceeds 10 m and the longitudinal permeability is less than 100 mD,the fall-siltseam shows a strong effect on longitudinal fluid migration,which completely suppresses the bottom-aquifer energy and there is no potential for liquid extraction.When the fall-siltseam thickness of the Guantao oil group is less than 1 m and the longitudinal permeability is greater than 100 mD,there is little effect of fall-siltseam on oil production,which cannot suppress bottom-aquifer energy and usually results in bottom-aquifer coning. This research is of great significance for remaining oil distribution patterns and production enhancement,which could also provide certain guidance for the comprehensive adjustment in the late development stage.
Due to the complex problems in fluid migration and remaining oil distribution in the late development stage,the sandy braided river reservoir of the Guantao oil group in the Bohai Q oilfield is taken to establish a mechanism model according to the fall-siltseam distribution patterns. The numerical simulation and reservoir engineering methods are used to quantitatively study the effects of reservoir configuration on fluid migration from the lateral and longitudinal directions and finally obtain the control coefficient expression of sandy braided river reservoir configuration. Research indicates that the lateral effect of sandy braided river reservoir configuration increases with the fallsiltseam thickness,lateral width,frequency and stratum dip-angle. When the siltseam thickness exceeds 10 m and the longitudinal permeability is less than 100 mD,the fall-siltseam shows a strong effect on longitudinal fluid migration,which completely suppresses the bottom-aquifer energy and there is no potential for liquid extraction.When the fall-siltseam thickness of the Guantao oil group is less than 1 m and the longitudinal permeability is greater than 100 mD,there is little effect of fall-siltseam on oil production,which cannot suppress bottom-aquifer energy and usually results in bottom-aquifer coning. This research is of great significance for remaining oil distribution patterns and production enhancement,which could also provide certain guidance for the comprehensive adjustment in the late development stage.
引文
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[17]张昌民.储层研究中的层次分析法[J].石油与天然气地质,1992,13(3):344-350.
[18]赵翰卿.储层非均质体系、砂体内部建筑结构和流动单元研究思路探讨[J].大庆石油地质与开发,2002,21(6):16-18.
[19]尹太举,张昌民,汤军,等.马厂油田储层层次结构分析[J].江汉石油学院学报,2001,23(4):19-22.
[20]陈玉琨,吴胜和,王延杰,等.常年流水型砂质辫状河心滩坝内部落淤层展布样式探讨[J].沉积与特提斯地质,2015,35(1):96-101.
[2]MIALL A D.Reconstructing the architecture and sequence stratigraphy of the preserved fluvial record as a tool for reservoir development:a reality check[J].AAPG,2006,90(7):989-1002.
[3]ASHWORTH P J,SMITH G H,BEST J L,et al.Evolution and sedimentology of a channel fill in the sandy braided South Saskatchewan River and its comparison to the deposits of an adjacent compound bar[J].Sedimentology,2011,58(7):1860-1883.
[4]WILLIS B.Ancient river systems in the Himalayan foredeep Chinji Villge area,northern Pakistan[J].Sedimentary Geology,1993,88(1):1-76.
[5]BEST J L,ASHWORTH P J,BRISTOW C S,et al.Three-dimensional sedimentary architecture of a large,midchannel sand braid bar,Jamuna river,Bangladesh[J].Journal of Sedimentary Research,2003,73(4):516-530.
[6]BRIDGE J S,TYE R S.Interpreting the dimensions of ancient fluvial channel bars,channels,and channel belts from wireline-logs and cores[J].AAPG,2000,84(8):1205-1228.
[7]何鲤,舒文震.长江上游的心滩---重庆珊瑚坝现代沉积考察[J].沉积学报,1986,4(1):118-125.
[8]曹耀华,张春生,刘忠保,等.长江枝江段凤凰滩现代沉积特征[J].江汉石油学院学报,1994,16(4):8-14.
[9]伍涛,王建国,王德发.辫状河砂体储层沉积学研究---以张家口地区露头砂体为例[J].沉积学报,1998,16(1):27-28.
[10]葛云龙,逯径铁,廖保方,等.辫状河相储集层地质模型---“泛连通体”[J].石油勘探与开发,1998,25(5):77-79.
[11]RUST B R,JONES B G.The Hawkesbury Sandstone South of Sydney,Australia:triassic analogue for the deposit of a large,braided river[J].Journal of Sedimentary Research,1987,57(2):222-233.
[12]何顺利,兰朝利,门成全.苏里格气田储层的新型辫状河沉积模式[J].石油学报,2005,26(6):25-29.
[13]廖保方,葛云龙,逯径铁,等.辫状河现代沉积研究与相模式---中国永定河剖析[J].沉积学报,1998,16(1):34-39.
[14]陈红,姚光庆,刘惠卿.宝浪油田三工河组III油组厚砂层夹层特征研究[J].复杂油气藏,2008,13(1):5-10.
[15]王改云,杨少春,廖飞燕,等.辫状河储层中隔夹层的层次结构分析[J].天然气地球科学,2009,20(3):378-383.
[16]岳大力,赵俊威,温立峰.辫状河心滩内部夹层控制的剩余油分布物理模拟实验[J].地学前缘,2012,19(2):157-161.
[17]张昌民.储层研究中的层次分析法[J].石油与天然气地质,1992,13(3):344-350.
[18]赵翰卿.储层非均质体系、砂体内部建筑结构和流动单元研究思路探讨[J].大庆石油地质与开发,2002,21(6):16-18.
[19]尹太举,张昌民,汤军,等.马厂油田储层层次结构分析[J].江汉石油学院学报,2001,23(4):19-22.
[20]陈玉琨,吴胜和,王延杰,等.常年流水型砂质辫状河心滩坝内部落淤层展布样式探讨[J].沉积与特提斯地质,2015,35(1):96-101.
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