储层随机模拟中的多尺度变差函数估算方法
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摘要
鉴于常规储层建模中平面变差函数获取途径单一,难以求取切合实际的变差函数的问题,提出多尺度平面变差函数求取策略。在多尺度变差函数适用性分析基础上,利用扶余油田平台12井区内测井资料(包括直井和水平井)、地震资料获取了6号小层的平面变差函数,通过分析、对比以上三种资料的平面变差函数,模拟不同尺度储层的特征。结果表明:①不同尺度的储层具有不同尺度的变差函数结构,而某种特定的资料只会获得某一尺度储层的变差函数,由多种资料得到的多尺度平面变差函数适用于不同尺度的储层描述。②研究区200m井距的常规直井测井资料砂岩变差函数的主、次变程分别为144.54m和100.03m,在大、小尺度上都不能很好地表征空间变异性;地震波阻抗数据体的砂岩变差函数的主、次变程分别为533.82m和409.10m,反映了大尺度(小层复合砂体)的变异特征;不同方向水平井测井资料砂岩变差函数的主、次变程分别为39.71m和11.22m,反映了小尺度(小层内单砂体)的变异特征。该方法为建立分层次储层地质模型提供了合理的平面变差函数,对具有类似资料特点地区的储层建模有借鉴作用。
Horizontal variograms cannot always be used in the reservoir simulation because there is only a single way to acquire them in conventional reservoir modeling.To solve this problem,we propose a strategy to obtain multi-scale horizontal variograms with different data.To test the applicability of the proposed approach,horizontal variograms of Layer6 are obtained based on 12-well logging data(including vertical and horizontal wells)and seismic data in Fuyu Oilfield,and then characteristics of different-scale reservoirs simulated by these variograms are analyzed.The following phenomena are observed:(1)The geological genesis may result in different-scale reservoirs with different-scale variograms,and a specific scale reservoir variogram can be obtained from a specific scale data,so multiscale horizontal variograms obtained from various data are suitable for different-scales reservoir description;(2)For sand variograms obtained from conventional vertical-well logging data in this area,the main and secondary ranges are 144.54 m and100.03 mrespectively,the spatial variation cannot be well described neither on the large scale nor on the small scale;(3)For sand variograms obtained from seismic impedance cube,the main and secondary ranges are 533.82 mand 409.1 mrespectively,which shows variation characteristics of large scale(composite sand body of thin layer).For Variograms obtained from horizontal-well logging data in different directions,the main and secondary ranges are 39.7 mand 11 mrespectively,which shows the variation characteristics of small scale(single sand body of thin layer).The proposed approach provides reasonable horizontal variograms for multi-scale reservoir modeling,which can be used for reservoir modeling in study areas with similar data.
Horizontal variograms cannot always be used in the reservoir simulation because there is only a single way to acquire them in conventional reservoir modeling.To solve this problem,we propose a strategy to obtain multi-scale horizontal variograms with different data.To test the applicability of the proposed approach,horizontal variograms of Layer6 are obtained based on 12-well logging data(including vertical and horizontal wells)and seismic data in Fuyu Oilfield,and then characteristics of different-scale reservoirs simulated by these variograms are analyzed.The following phenomena are observed:(1)The geological genesis may result in different-scale reservoirs with different-scale variograms,and a specific scale reservoir variogram can be obtained from a specific scale data,so multiscale horizontal variograms obtained from various data are suitable for different-scales reservoir description;(2)For sand variograms obtained from conventional vertical-well logging data in this area,the main and secondary ranges are 144.54 m and100.03 mrespectively,the spatial variation cannot be well described neither on the large scale nor on the small scale;(3)For sand variograms obtained from seismic impedance cube,the main and secondary ranges are 533.82 mand 409.1 mrespectively,which shows variation characteristics of large scale(composite sand body of thin layer).For Variograms obtained from horizontal-well logging data in different directions,the main and secondary ranges are 39.7 mand 11 mrespectively,which shows the variation characteristics of small scale(single sand body of thin layer).The proposed approach provides reasonable horizontal variograms for multi-scale reservoir modeling,which can be used for reservoir modeling in study areas with similar data.
引文
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[12] 刘太勋,陶自强.界面约束法在曲流河储层构型建模中的应用[J].中国石油大学学报(自然科学版),2011,35(3):26-30.LIU Taixun,TAO Ziqiang.Application of bounding surface restriction to meandering river reservoir architecture modeling[J].Journal of China University of Petroleum(Edition of Natural Science),2011,35(3):26-30.
[13] 李宇鹏,吴胜和,耿丽慧,等.基于空间矢量的点坝砂体储层构型建模[J].石油学报,2013,34(1):133-139.LI Yupeng,WU Shenghe,GENG Lihui,et al.Spatial-vector-based reservoir architecture modeling of meandering point bar sand[J].Acta Petrolei Sinica,2013,34(1):133-139.
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[17] 陈文浩,董少群,王志章,等.致密砂岩地震储层质量评价方法研究[J].中国石油大学学报:自然科学版,2016,40(3):63-68.CHEN Wenhao,DONG Shaoqun,WANG Zhizhang,et al.Seismic reservoir quality evaluation in tight sandstone reservoirs[J].Journal of China University of Petroleum(Edition of Natural Science),2016,40(3):63-68.
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[19] 胡向阳,袁向春,侯加根,等.多尺度岩溶相控碳酸盐岩缝洞型油藏储集体建模方法[J].石油学报,2014,35(2):340-346.HU Xiangyang,YUAN Xiangchun,HOU Jiagen,et al.Modeling method of carbonate fractured-cavity reservoirs using multiscale karst facies-controlling[J].Acta Petrolei Sinica,2014,35(2):340-346.
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