河流相沉积储层地震精细预测方法研究与应用——以渤海湾盆地冀中坳陷古近系河道砂为例
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摘要
河流相沉积砂岩是陆相断陷常见的储层类型。由于河流改道频繁,砂、泥岩交互发育且横向变化快,造成地震反射连通性差,加之受分辨率限制,储层预测难度较大。以渤海湾盆地冀中坳陷中部研究区为例,进行了层位的精细标定和等时地层对比下的精细解释,进行优选提取地震属性并进行三维可视化立体雕刻;研究薄层的调谐频率,并利用分频研究结果预测河道平面分布;构建合理的地质模型,优选参数进行拟声波反演取得较高精度的预测结果。
Fluvial sandstone reservoirs are common in continental fault depressions.They are characterized by vertical alternating of sandstone and mudstone and lateral rapid change of lithofacies caused by frequent river diversion.These features lead to discrete seismic reflection.This,in addition to the limitation of seismic resolution,increases the difficulty of reservoir prediction.Taking the study area in the central Jizhong Depression of the Bohai Bay Basin as an example,we studied fine seismic interpretation based on accurate horizon calibration and isochronous stratigraphic correlation.Based on that,we optimized extraction of seismic attributes and built up 3D visualization model.Frequency tuning for thin layers was performed and the results of frequency division were used to predict river channel distribution in plane.We also set up rational geological models and performed pseudo-sonic inversion with optimized parameters to obtain high-precise reservoir prediction results.
Fluvial sandstone reservoirs are common in continental fault depressions.They are characterized by vertical alternating of sandstone and mudstone and lateral rapid change of lithofacies caused by frequent river diversion.These features lead to discrete seismic reflection.This,in addition to the limitation of seismic resolution,increases the difficulty of reservoir prediction.Taking the study area in the central Jizhong Depression of the Bohai Bay Basin as an example,we studied fine seismic interpretation based on accurate horizon calibration and isochronous stratigraphic correlation.Based on that,we optimized extraction of seismic attributes and built up 3D visualization model.Frequency tuning for thin layers was performed and the results of frequency division were used to predict river channel distribution in plane.We also set up rational geological models and performed pseudo-sonic inversion with optimized parameters to obtain high-precise reservoir prediction results.
引文
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2赵政璋,赵贤正,王英民,等.储层地震预测理论与实践[M].北京:科学出版社,2005
3毛凤鸣,陈安定,严元锋,等.苏北盆地复杂小断块油气成藏特征及地震识别技术[J].石油与天然气地质,2006,27(6):827～840
4谭俊敏,刘丽峰,许云书,等.麻黄山西区块二维地震资料综合解释与圈闭评价[J].石油与天然气地质,2007,28(1):92～99
5范洪军,李军,肖毓祥,等.地震分频技术在扇三角洲演化过程研究中的应用[J].石油与天然气地质,2007,28(5):682～686,692
6刘成斋.胜利探区地震采集技术发展历程回顾与启示[J].石油与天然气地质,2008,29(3):397～404
7王捷.油藏描述技术——勘探阶段[M].北京:石油工业出版社,1996
8印兴耀,韩文功,李振春,等.地震技术新进展[M].山东东营:中国石油大学出版社,2006
9沈财余,崔汝国.影响测井约束地震反演地质效果因素的分析[J].物探与化探,2003,27(2):123～127
10宋维琪.应用地震属性与测井数据反演储层参数[J].勘探地球物理进展,2003,26(3):216～219
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