自旋回和异旋回的识别及其在油藏地层对比中的作用
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摘要
在分析自旋回、异旋回的发育背景、控制因素、存在的级别和范围的基础上,探讨自旋回的识别方法和自旋回对异旋回的改造和影响。结果表明:低频的层序或旋回(1～4级)是受基准面变化产生的异旋回,中频的层序或旋回(5～6级)是受自旋回改造或干扰强烈的异旋回,高频层序或旋回(7级以上)属于自旋回;自旋回一般破坏异旋回的特征,使地层对比变得困难,但可以通过垂直物源方向和平行物源方向的对比剖面相互校对进行识别;特征明显的、分布范围广的事件性沉积(自旋回)可以在小层对比中起到正面作用,在油藏级别的地层对比过程中,由于地震剖面分辨率低,所起的作用很小,必须建立对比模式。
On the basis of the analysis of the developing background,controlling factors and the scale of auto-cycle and allo-cycle,the recognition method of auto-cycle and the effects and alternation of auto-cycle on allo-cycle were discussed.The results show that the lower frequency scale sequence or cycle(1-4 scale) are allo-cycle produced by base level change,middle frequency scale sequence or cycle(5-6 scale) are allo-cycle reformed or highly effected by auto-cycle,high frequency scale sequence or cycle(higher than 7 scale) are auto-cycle.The characteristics of allo-cycle are frequently destroyed by auto-cycle,which makes it difficult to do correlation according to allo-cycle.But the auto-cycle can be recognized by correlating the correlation profiles which are parallel and perpendicular to the sedimentary source direction.The characterized and widely spread event deposits(auto-cycle) are important to the high frequency scale strata correlation.Because the resolution of seismic profile is lower,its role in the strata correlation of reservoir scale is small,so correlation models are needed to be developed.
On the basis of the analysis of the developing background,controlling factors and the scale of auto-cycle and allo-cycle,the recognition method of auto-cycle and the effects and alternation of auto-cycle on allo-cycle were discussed.The results show that the lower frequency scale sequence or cycle(1-4 scale) are allo-cycle produced by base level change,middle frequency scale sequence or cycle(5-6 scale) are allo-cycle reformed or highly effected by auto-cycle,high frequency scale sequence or cycle(higher than 7 scale) are auto-cycle.The characteristics of allo-cycle are frequently destroyed by auto-cycle,which makes it difficult to do correlation according to allo-cycle.But the auto-cycle can be recognized by correlating the correlation profiles which are parallel and perpendicular to the sedimentary source direction.The characterized and widely spread event deposits(auto-cycle) are important to the high frequency scale strata correlation.Because the resolution of seismic profile is lower,its role in the strata correlation of reservoir scale is small,so correlation models are needed to be developed.
引文
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[13]WRIGHT V P,MARRIOTT S B.The sequence stratig-raphy of fluvial depositional systems the role of flood-plain sediment storage[J].Sedimentary Geology,1993,86:203-210.
[2]邓宏文,吴海波,王宁,等.河流相层序地层划分方法:以松辽盆地下白垩统扶余油层为例[J].石油与天然气地质,2007,28(5):621-627.DENG Hong-wen,WU Hai-bo,WANG Ning,et al.Di-vision of fluvial sequence stratigraphy:an example fromthe Lower Cretaceous Fuyu oil-bearing layer,the SongliaoBasin[J].Oil&Gas Geology,2007,28(5):621-627.
[3]李宏伟,袁士义,朱怡翔,等.河流相地层相分异与沉积物体积分配规律[J].石油与天然气地质,2005,26(3):356-360.LI Hong-wei,YUAN Shi-yi,ZHU Yi-xiang,et al.Faci-es differentiation and sedimentation volume partition offluvial strata[J].Oil&Gas Geology,2005,26(3):356-360.
[4]刘波.基准面旋回与沉积旋回的对比方法探讨[J].沉积学报,2002,20(1):112-117.LIU Bo.Discussion on the correlation methods of base-level cycle and sedimentary cycle sequence[J].ActaSedimentologica Sinica,2002,20(1):112-117.
[5]CROSS T A.Stratigraphic controls on reservoir attributesin continental strata[J].Geoscience Frontiers,2000,7(4):322-350.
[6]SHANLEY KW,MCCABE P J,HETTINGER R D.Tid-al influence in Cretaceous fluvial strata from Utah,USA:a key to sequence stratigraphic interpretation[J].Sedim-entology,1993,35:905-930.
[7]袁新涛,沈平平.高分辨率层序框架内小层综合对比方法[J].石油学报,2007,28(6):87-91.YUAN Xin-tao,SHEN Ping-ping.Continental strata cor-relation of high-resolution sequence in reservoir develop-ment phase[J].Acta Petrolei Sinica,2007,28(6):87-91.
[8]张周良.河流相地层的层序地层学与河流类型[J].地质论评,1996,42(增刊):188-193.ZHANG Zhou-liang.Fluvial sequence stratigraphy andriver types[J].Geological Review,1996,42(sup):188-193.
[9]邓宏文,王红亮,阎伟鹏,等.河流相层序地层构成模式探讨[J].沉积学报,2004,22(3):373-379.DENG Hong-wen,WANG Hong-liang,YAN Wei-peng,et al.Architecture model of sequence stratigraphy in flu-vial facies[J].Acta Sedimentologica Sinica,2004,22(3):373-379.
[10]冯有良,邱以钢.高精度层序地层学在济阳坳陷下第三系隐蔽油气藏勘探中的应用[J].石油学报,2003,24(1):49-52.FENG You-liang,QIU Yi-gang.Application of highresolution sequence stratigraphy to exploration of LowerTertiary subtle reservoirs in Jiyang Subbasin[J].ActaPetrolei Sinica,2003,24(1):49-52.
[11]吴胜和,马晓芬,王仲林.温米油田开发阶段高分辨率层序地层学研究[J].石油学报,1999,20(5):33-38.WU Sheng-he,MA Xiao-fen,WANG Zhong-lin,et al.High resolution sequence stratigraphical research in res-ervoir development stage of Wenmi Oilfield[J].ActaPetrolei Sinica,1999,20(5):33-38.
[12]国景星,戴启德,吴丽艳,等.冲积-河流相层序地层学研究[J].石油大学学报:自然科学版,2003,27(4):15-19.GUO Jing-xing,DAI Qi-de,WU Li-yan,et al.Studyon alluvial-fluvial facies sequence stratigraphy[J].Jour-nal of the University of Petroleum,China(Edition ofNatural Science),2003,27(4):15-19.
[13]WRIGHT V P,MARRIOTT S B.The sequence stratig-raphy of fluvial depositional systems the role of flood-plain sediment storage[J].Sedimentary Geology,1993,86:203-210.
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