随机地震反演在川西坳陷DY构造储层预测中的应用
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摘要
川西坳陷DY构造是川西深层须家河组勘探和开发的重点区块,目前已完钻5口井,测试显示该区块具有较好的勘探和开发潜力。为了更好地进行下一步勘探和开发工作,目前亟须查明该地区须家河组砂体的空间展布特征。通过对地震反演方法的比较认为,基于统计学的概率密度函数随机地震反演方法是DY构造现阶段最佳的地震反演方法。该方法将地震随机反演与地质统计有机结合,充分考虑了地下介质的随机特性,使反演结果更符合实际地质情况,且分辨率较高,解决了基于模型反演方法对井的依赖性较强、未考虑地下介质的随机特性、模型化严重、多解性较强等问题。在统计和分析测井资料所反映的地球物理特征的基础上,认为该地区仅利用速度反演就能够很好地得到砂体的空间展布特征,但是进一步区分有利砂体和干层的效果较差。采用基于统计学的概率密度函数随机地震反演方法,对川西坳陷DY构造须家河组的砂体进行了预测,预测结果与实际钻井结果吻合较好,为该地区下一步勘探和开发提供了依据。
DY structure of Western Sichuan Depression is the main area for the exploration and development of deep Xujiahe Formation. Five wells have been drilled,and well testing shows that the block is a potential area.In order to better carry out exploration and development for the next step,we need to investigate the spatial distribution characteristics of sand bodies of Xujiahe Formation in the block.Comparison by using seismic inversion methods indicates that stochastic seismic inversion method based on statistical probability density function is the best method appropriated for DY structure in present.The method gives enough consideration to the random characteristics of subsurface geologic bodies,to make the inversion results be more suitable to the actual conditions and be higher in resolution.Further,this method has overcome the problems caused by the model-based method,such as strong dependency on wells,without consideration on the random characteristics of subsurface geologic bodies,serious modeling degree and ambiguity, etc.Based on the statistics and analysis on the geophysical characteristics reflected by log data,we found that the spatial distribution feature of sandbodies can be well achieved only by using velocity inversion in the area,but it is difficult to further distinguish sandbodies and dry layer.The stochastic seismic inversion method was applied to predict the sandbodies of Xujiahe Formation in the area. The prediction result is accord with actual drilling data,which provides basis for further exploration and development.
DY structure of Western Sichuan Depression is the main area for the exploration and development of deep Xujiahe Formation. Five wells have been drilled,and well testing shows that the block is a potential area.In order to better carry out exploration and development for the next step,we need to investigate the spatial distribution characteristics of sand bodies of Xujiahe Formation in the block.Comparison by using seismic inversion methods indicates that stochastic seismic inversion method based on statistical probability density function is the best method appropriated for DY structure in present.The method gives enough consideration to the random characteristics of subsurface geologic bodies,to make the inversion results be more suitable to the actual conditions and be higher in resolution.Further,this method has overcome the problems caused by the model-based method,such as strong dependency on wells,without consideration on the random characteristics of subsurface geologic bodies,serious modeling degree and ambiguity, etc.Based on the statistics and analysis on the geophysical characteristics reflected by log data,we found that the spatial distribution feature of sandbodies can be well achieved only by using velocity inversion in the area,but it is difficult to further distinguish sandbodies and dry layer.The stochastic seismic inversion method was applied to predict the sandbodies of Xujiahe Formation in the area. The prediction result is accord with actual drilling data,which provides basis for further exploration and development.
引文
[1]谯述蓉,张虹,赵爽.川西DY地区须家河组致密砂岩储层预测技术及应用效果分析[J].石油与天然气地质,2008,29(6):774-780
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[10]张波.随机模拟技术在太阳岛—葵花岛地区储层预测中的应用[J].特种油气藏,2008,15(5):46-49
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[12]刘勇,雷茂盛,李来林,等.地震资料随机反演方法[J].石油物探,1998,37(增刊):31-35
[13]黄捍东,张如伟,魏世平.地震非线性随机反演方法在陆相薄砂岩储层预测中的应用[J].石油学报, 2009,30(3):386-390
[14]慎国强,孟宪军,王玉梅,等.随机地震反演方法及其在埕北35井区的应用[J].石油地球物理勘探, 2004,39(1):75-81
[15]王秀娟,吴时国,余鹏,等.混合地震反演技术及其在水合物勘探中的应用[J].石油物探,2007,46(3):278-301
[16]尹兵祥,杨剑萍,尹克敏.东营凹陷民丰断裂带地区地震反演及储层预测[J].石油物探,2007,46(5):484-487
[17]王思权,李瑞.概率密度函数随机反演在储层预测中的应用——以蜀南某地区嘉陵江组储层预测为例[J].天然气勘探与开发,2008,31(3):23-26
[2]张永刚.地震波阻抗反演技术的现状和发展[J].石油物探,2002,41(4):385-390
[3]黄花香,吴战培,熊艳,等.速度反演技术在四川盆地储层预测中的应用[J].石油物探,2002,41(4): 456-460
[4]王延光.储层地震反演方法以及应用中的关键问题与对策[J].石油物探,2002,41(3):299-303
[5]谭明友,张建宁.地震反演结果的评价方法[J].石油物探,2004,43(6):551-555.
[6]徐明华,朱心万,王达明,等.苏里格气田苏5区块储层地震反演预测技术[J].天然气工业,2007,27(12):33-35
[7]易平,林桂康.随机地震反演技术及在文昌13-1油田的应用[J].石油地球物理勘探,2005,40(1):87-89
[8]陈淑梅,丛向元,武艳春,等.测井随机反演技术在油田开发地震中的应用[J].天然气工业,2007,27(增刊A):333-335
[9]高哲红,陈秀娟,徐爱丽.基于模型约束非线性反演与测井随机约束反演技术的联合应用分析[J].天然气工业,2007,27(增刊A):345-348
[10]张波.随机模拟技术在太阳岛—葵花岛地区储层预测中的应用[J].特种油气藏,2008,15(5):46-49
[11]刘百红,李建华,魏小东,等.随机反演在储层预测中的应用[J].地球物理学进展,2009,24(2):581-589
[12]刘勇,雷茂盛,李来林,等.地震资料随机反演方法[J].石油物探,1998,37(增刊):31-35
[13]黄捍东,张如伟,魏世平.地震非线性随机反演方法在陆相薄砂岩储层预测中的应用[J].石油学报, 2009,30(3):386-390
[14]慎国强,孟宪军,王玉梅,等.随机地震反演方法及其在埕北35井区的应用[J].石油地球物理勘探, 2004,39(1):75-81
[15]王秀娟,吴时国,余鹏,等.混合地震反演技术及其在水合物勘探中的应用[J].石油物探,2007,46(3):278-301
[16]尹兵祥,杨剑萍,尹克敏.东营凹陷民丰断裂带地区地震反演及储层预测[J].石油物探,2007,46(5):484-487
[17]王思权,李瑞.概率密度函数随机反演在储层预测中的应用——以蜀南某地区嘉陵江组储层预测为例[J].天然气勘探与开发,2008,31(3):23-26
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