沉积相地震波波形响应特征研究——以渤海湾盆地孤南洼陷沙三中亚段中部为例
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摘要
依据地震波波形理论,进行地震相自动识别、划分,可确定沉积体系平面分布特征。与传统方法相比较,该方法具有更省时、更客观、更准确的优势。利用此方法研究了渤海湾盆地孤南洼陷沙三中亚段中部地层沉积体系平面分布规律。相模型道与沉积相具有较好的响应关系,其对沉积相变化较敏感,可用于微相划分。研究表明,孤南洼陷沙三中亚段中部地层沉积时期,存在辫状河三角洲、盆底扇和湖泊3种沉积体系。辫状河三角洲在该区发育前缘亚相,分布于孤南洼陷南部斜坡区域;盆底扇主要分布于洼陷北部,位于孤南断裂坡脚部位,浅湖近岸滩坝滑塌也可形成盆底扇复合体。该时期的湖泊较浅,主要发育浅湖亚相,近岸滩坝及席状砂也较丰富。
According to the seismic waveform theories,the seismic facies have been identified and divided automatically and the plane distribution of the depositional systems have also been determined.Compared with the traditional methods,this method has the advantages of saving time,more objective and more accuracy.Using this method,the plane distribution of the depositional system of the middle part of middle submember of the 3rd member of Shahejie Formation has been studied in Gunan Sag of the Bohai Bay Basin.There is preferable relationship between the seismic facies models and the sedimentary facies,and at the same time,they are sensitive for sedimentary facies changes,therefore,can be used for microfacies division.It indicates that three depositional systems,including braided-river delta,basin floor fan and lake depositional system,were existing in the Gunan Sag at this time.The front subfacies of the braided-river delta was developed in the south slope of Gunan Sag.The basin floor fan was mainly distributed in the north of the sag,located in basal slope of the Gunan fault.In addition,the slump of the nearshore strand bar also can form basin floor fan complex.In this period,the nearshore strand sandstone bar and sheet are more abundant.
According to the seismic waveform theories,the seismic facies have been identified and divided automatically and the plane distribution of the depositional systems have also been determined.Compared with the traditional methods,this method has the advantages of saving time,more objective and more accuracy.Using this method,the plane distribution of the depositional system of the middle part of middle submember of the 3rd member of Shahejie Formation has been studied in Gunan Sag of the Bohai Bay Basin.There is preferable relationship between the seismic facies models and the sedimentary facies,and at the same time,they are sensitive for sedimentary facies changes,therefore,can be used for microfacies division.It indicates that three depositional systems,including braided-river delta,basin floor fan and lake depositional system,were existing in the Gunan Sag at this time.The front subfacies of the braided-river delta was developed in the south slope of Gunan Sag.The basin floor fan was mainly distributed in the north of the sag,located in basal slope of the Gunan fault.In addition,the slump of the nearshore strand bar also can form basin floor fan complex.In this period,the nearshore strand sandstone bar and sheet are more abundant.
引文
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2胡海燕.渤海湾盆地新滩油田垦东32-33块隐蔽油气藏研究[J].石油实验地质,2007,29(2):203~206
3姜辉,于兴河,李庆明等.Muglad盆地Nugara坳陷东凹Dar-fur群地震层序格架和地震相[J].油气地质与采收率,2006,13(5):24~27
4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
5杨飞,张宏艳,陈俊生.岩性油藏勘探方法研究:以渤海湾盆地辽河坳陷为例[J].石油实验地质,2007,29(1):95~98
6曹学良,曹延军,姜传恩等.胡状集地区地震岩性反演与储层预测[J].石油与天然气地质,2001,22(3):225~229
7庄丽.东营凹陷永安镇三角洲层序地层与沉积体系[J].石油实验地质,2006,28(6):544~548
8 Weimer P.Siliciclastic sequence stratigraphy:recent develop-ments and applications[M].Tulsa:AAPG,1979.345~376
9程浪洪.塔里木盆地轮古西地区多地震属性储层综合预测[J].油气地质与采收率,2007,14(3):78~80
10郝志伟,王楠,孙明涛等.太平油田馆陶组下段辫状河储层地震反射假象分析[J].油气地质与采收率,2007,14(1):62~65
11包约翰.自适应模式识别与神经网络[M].北京:科学出版社,1992
12刘力辉.应用自组织神经网络划分地震微相[J].石油地球物理勘探,1996,31(增刊2):90~100
13段玉顺.地震相的自动识别方法及应用[J].石油地球物理勘探,2004,39(2):158~162
14张乐,姜在兴,郑宁等.孤南洼陷新生代构造演化特征及其对沉积的控制作用[J].油气地质与采收率,2007,14(3):37~41
15高树新,任怀强,杨少春.渤海湾盆地济阳坳陷陈家庄凸起东段北斜坡油源特征及成藏分析[J].石油实验地质,2007,29(1):73~77
16董春梅.基于河水位变化的层序地层模式:以济阳坳陷孤东油田为例[J].石油实验地质,2006,28(3):249~252
17赵俊兴.高分辨层序地层学方法在沉积前古地貌恢复中的应用[J].成都理工大学学报(自然科学版),2003,30(1):74~78
18王家豪.层序地层学应用于古地貌分析[J].地球科学———中国地质大学学报,2003,28(4):381~385
19徐长贵.古地貌分析在渤海古近系储层预测中的应用[J].石油勘探与开发,2004,31(5):511~515
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