基于正演模拟的复合曲流带砂体内部构型解剖研究及应用
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摘要
Q油田是渤海大型河流相沉积的稠油油田,其北区NmⅣ1主力含油砂体为复合曲流带沉积,经过16年的注水开发,油水关系复杂,平面注水受效不均的问题日益严重,如何优化注釆结构来改善开发效果已成为急需解决的问题。优化现有注釆井网的关键是认识复合曲流带砂体内部不同单河道砂体的切叠关系及展布特征,即对目标砂体开展内部不同单河道的构型单元分布特征研究。首先,依据岩电标定的测井曲线特征、局部发育的薄夹层以及曲流河纵向下切模式,对复合砂体内部不同单河道砂进行划分与对比;然后基于单井沉积微相划分结果,开展井间剖面相对比分析,表明复合砂体内部存在5种不同单河道砂体切叠模式;建立5种正演概念模型,利用地震正演模拟合成地震记录,总结了不同单河道砂体间顶面高程差异、点坝边界、废弃河道等曲流河砂体构型边界的波形特征;利用地震属性提取及多种地质构型方法,综合分析,最终实现了海上大井距条件下复合曲流带砂体内部不同单一曲流河砂体构型边界的精细识别;最后由注采动态资料的响应关系评估不同的切叠模式对注水效果的侧向遮挡程度,并以此为依据,优化现有的注釆井网并取得了非常好的生产效果。
Q oil field is a big fluvial deposition heavy oil field in Bohai.The NmⅣ1 oil-bearing sand body is composed of abandoned meander belt sedimentation.After more than 15 years' waterflood development,the present situation of the complex oil-water distribution and ineffective water-injection is grim.How to optimize the injection structure and improve the development more effectively is a main problem that the oilfield is facing.The key to optimizing the existing well network is identifying different single meander river sands and distinguishing the connection line between different sand bodies within or beyond separate channels.First of all,according to the characteristics of rock-electic logging curve,thin layers and the incision of channel,the different single channel sandbodies can be identified within the complex meander belt deposition in the process of multiple wells section correlation.Second,based on recognition of sedimentary microfacies,five different micro phase sand body cutting relations within or beyond single channel in meander belt were concluded by wells correlation.Five respective geological models were built based on five connections described above.Through combined seismic record obtained from seismic forward modelling,the different seismic wave features of the structure boundary of meander river sand body are summarized such as height difference between sand bodies,point bar boundary and abandoned channel etc.By the method of seismic attribute extraction and various geologic configuration,precise recognition of different single river sands within complex meander belt deposition will be realized.At last,accompanied with production dynamic data,the degree of lateral barrier of water injection effect is evaluated by different cutting modes.According to that,there is a very good effect by optimizing the injection structure.
Q oil field is a big fluvial deposition heavy oil field in Bohai.The NmⅣ1 oil-bearing sand body is composed of abandoned meander belt sedimentation.After more than 15 years' waterflood development,the present situation of the complex oil-water distribution and ineffective water-injection is grim.How to optimize the injection structure and improve the development more effectively is a main problem that the oilfield is facing.The key to optimizing the existing well network is identifying different single meander river sands and distinguishing the connection line between different sand bodies within or beyond separate channels.First of all,according to the characteristics of rock-electic logging curve,thin layers and the incision of channel,the different single channel sandbodies can be identified within the complex meander belt deposition in the process of multiple wells section correlation.Second,based on recognition of sedimentary microfacies,five different micro phase sand body cutting relations within or beyond single channel in meander belt were concluded by wells correlation.Five respective geological models were built based on five connections described above.Through combined seismic record obtained from seismic forward modelling,the different seismic wave features of the structure boundary of meander river sand body are summarized such as height difference between sand bodies,point bar boundary and abandoned channel etc.By the method of seismic attribute extraction and various geologic configuration,precise recognition of different single river sands within complex meander belt deposition will be realized.At last,accompanied with production dynamic data,the degree of lateral barrier of water injection effect is evaluated by different cutting modes.According to that,there is a very good effect by optimizing the injection structure.
引文
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[14]季敏,王尚旭,李生杰,等.物理模型的地震属性预测效果分析[J].石油勘探与开发,2007,34(3):339-341.
[2]汪巍,侯东梅,马佳国,等.海上油田高弯度曲流河储层构型表征---以渤海曹妃甸11-1油田主力砂体Lm943为例[J].中国海上油气,2016,28(4):55-62.
[3]刘建民,徐守余.河流相储层沉积模式及对剩余油分布的控制[J].石油学报,2003,24(1):58-62.
[4]王凤兰,白振强,朱伟.曲流河砂体内部构型及不同开发阶段剩余油分布研究[J].沉积学报,2003,24(1):58-62.
[5]沈玉林,郭英海,李壮福,等.鄂尔多斯地区石炭-二叠纪三角洲的沉积机理[J].中国矿业大学学报,2012,41(6):936-942.
[6]MIALL A D.Architectural element analysis:a new method of facies analysis applied to fluvial deposites[J].Earth Science Reviews,1985,22(2):261-308.
[7]MIALL A D.Reservoir heterogeneities in fluvial sandstone:Lessons from outcrop studies[J].AAPG Bulletin,1988,72(6):682-697.
[8]马中振,戴国威,盛晓峰,等.松辽盆地北部连续型致密砂岩油藏的认识及其地质意义[J].中国矿业大学学报,2013,42(2):221-229.
[9]周银邦,吴胜和,计秉玉,等.曲流河储层构型表征研究进展[J].地球科学进展,2011,26(7):695-702.
[10]岳大力,吴胜和,谭河清,等.曲流河古河道储层构型精细解剖:以孤东油田七区西馆陶组为例[J].地学前缘,2008,15(1):101-109.
[11]岳大力,吴胜和,刘建民.曲流河点坝地下储层构型精细解剖方法[J].石油学报,2007,28(4):99-103.
[12]岳大力,吴胜和,程会明,等.基于三维储层构型模型的油藏数值模拟及剩余油分布模式[J].中国石油大学学报:自然科学版,2008,32(2):21-27.
[13]于兴河.油田开发中后期储层面临的问题与基于沉积成因的地质表征方法[J].地学前缘,2012,19(2):1-14.
[14]季敏,王尚旭,李生杰,等.物理模型的地震属性预测效果分析[J].石油勘探与开发,2007,34(3):339-341.
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