渤海湾盆地东营凹陷砂岩储层地震特征及对岩石结构的指示
|
摘要
系统选取渤海湾盆地东营凹陷古近系各层段砂岩样品250块(以沙河街组为主),并在模拟储层条件下利用脉冲穿透法测试样品的纵、横波速度,在此基础上给出储层条件下速度-孔隙度、速度-密度等的统计岩石物理模型。样品在纵波速度-泊松比交汇图中呈现出两种主要变化趋势,分别对应泥质与钙质胶结物的影响。在每个变化趋势中,随泥质含量与钙质胶结物含量的增加,岩石结构从颗粒支撑逐渐表现为基质支撑,弹性波能量的传播也从通过颗粒接触边界转变为通过岩石基质传播。这是使砂岩样品测试结果表现出两种截然不同变化趋势的主要原因,为利用岩石物理特性从地震资料中提取岩石结构、沉积与成岩特征的信息提供了依据。
A total of 250 sandstone samples were selected from various sections of the Paleogene(dominated by the Shahejie Formation) in the Dongying Sag of the Bohai Bay Basin to measure their compressional-and shear-wave velocities by pulse transmission techniques under simulated reservoir conditions.Statistic petrophysical models under reservoir conditions,such as velocity versus porosity and velocity versus density,were built based on the measured data.On the cross plot of P-wave velocity vs.Possion's ratio,the samples show two major trends,which reflect the effects of shale content and calcareous cement content on the elastic properties of sandstone samples respectively.For each trend,the rock texture changes gradually from grain-supporting to matrix-supporting with the increase of shale content and calcareous cement content,and thus the propagation of elastic wave also changes from via grain-to-grain contacts to via rock matrix.These are the main reasons for the two entirely different trends of the sandstone samples.The results provide a basis for extracting information about rock texture,sedimentary and diagenetic features by using the petrophysical properties of reservoir sandstones.
A total of 250 sandstone samples were selected from various sections of the Paleogene(dominated by the Shahejie Formation) in the Dongying Sag of the Bohai Bay Basin to measure their compressional-and shear-wave velocities by pulse transmission techniques under simulated reservoir conditions.Statistic petrophysical models under reservoir conditions,such as velocity versus porosity and velocity versus density,were built based on the measured data.On the cross plot of P-wave velocity vs.Possion's ratio,the samples show two major trends,which reflect the effects of shale content and calcareous cement content on the elastic properties of sandstone samples respectively.For each trend,the rock texture changes gradually from grain-supporting to matrix-supporting with the increase of shale content and calcareous cement content,and thus the propagation of elastic wave also changes from via grain-to-grain contacts to via rock matrix.These are the main reasons for the two entirely different trends of the sandstone samples.The results provide a basis for extracting information about rock texture,sedimentary and diagenetic features by using the petrophysical properties of reservoir sandstones.
引文
1李丕龙,庞雄奇.陆相断陷盆地隐蔽油气藏形成——以济阳坳陷为例[M].北京:石油工业出版社,2004.85～113
2蔡进功,谢忠怀,刘宝军,等.胜利油区深部砂岩储集层类型及特征[J].石油学报,2001,22(5):34～37
3邱桂强.东营凹陷古近系成岩层序特征与储集差异性分析[J].沉积学报,2007,25(6):915～922
4陈冬霞,庞雄奇,翁庆萍,等.岩性油气藏三元成因模式及初步应用[J].石油与天然气地质,2003,24(3):228～232
5张晶,王伟锋,荣启宏,等.东营凹陷民丰洼陷沙河街组三段岩性油藏控制因素[J].石油与天然气地质,2007,28(2):235～249
6邓继新,王尚旭,李生杰,等.砂岩储层地震属性参数对孔隙流体的敏感性评价[J].石油学报,2006,27(6):58～62
7李生杰.岩性、孔隙及其流体变化对岩石弹性性质的影响[J].石油与天然气地质,2005,26(6):760～764
8王尚旭.含气地层弹性性质及其波场响应[J].石油与天然气地质,2006,26(6):730～735
9袁红军.东营凹陷博兴洼陷滨浅湖相滩坝砂岩储层预测[J].石油与天然气地质,2007,26(4):497～503
10邓继新,史謌,俞军.流体饱和岩石速度频散研究[J].北京大学学报,2003,39(6):835～843
11Mavko G,Mukerji T,Dvorkin J.The rock physics handbook:tools for seismic analysis in porous media[M].New York,USA:Cam-bridge University Press,1998.106-160
12Han Dehua.Effects of porosity and clay contents on wave velocities in sandstone and unconsolidated sediments[D].Standford Uni-versity,1987
2蔡进功,谢忠怀,刘宝军,等.胜利油区深部砂岩储集层类型及特征[J].石油学报,2001,22(5):34～37
3邱桂强.东营凹陷古近系成岩层序特征与储集差异性分析[J].沉积学报,2007,25(6):915～922
4陈冬霞,庞雄奇,翁庆萍,等.岩性油气藏三元成因模式及初步应用[J].石油与天然气地质,2003,24(3):228～232
5张晶,王伟锋,荣启宏,等.东营凹陷民丰洼陷沙河街组三段岩性油藏控制因素[J].石油与天然气地质,2007,28(2):235～249
6邓继新,王尚旭,李生杰,等.砂岩储层地震属性参数对孔隙流体的敏感性评价[J].石油学报,2006,27(6):58～62
7李生杰.岩性、孔隙及其流体变化对岩石弹性性质的影响[J].石油与天然气地质,2005,26(6):760～764
8王尚旭.含气地层弹性性质及其波场响应[J].石油与天然气地质,2006,26(6):730～735
9袁红军.东营凹陷博兴洼陷滨浅湖相滩坝砂岩储层预测[J].石油与天然气地质,2007,26(4):497～503
10邓继新,史謌,俞军.流体饱和岩石速度频散研究[J].北京大学学报,2003,39(6):835～843
11Mavko G,Mukerji T,Dvorkin J.The rock physics handbook:tools for seismic analysis in porous media[M].New York,USA:Cam-bridge University Press,1998.106-160
12Han Dehua.Effects of porosity and clay contents on wave velocities in sandstone and unconsolidated sediments[D].Standford Uni-versity,1987
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心