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| 歧南凹陷地震沉积学研究 |
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董艳蕾1,2,朱筱敏1,2,曾洪流3,边树涛4,刘长利1,2,成克男1,2,徐新宇1,2
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(1.中国石油大学资源与信息学院，北京102249 ;2.中国石油大学油气成藏机理教育部重点实验室，北京102249;3.美国德克萨斯大学奥斯丁分校,Austin 78713 - 8924 ;4.中国地质大学能源学院，北京100083)
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| 摘要: |
| 为了对黄骅坳陷歧南凹陷的沉积体系进行更为精确细致的刻両，利用相位调整、分频解释和地层切片等关键 技术,对该区古近系和新近系进行了地震沉积学的研究。结果表明:经过90°相位调整后的地震数据使地震道近似 于波阻抗剖面,从而可大大提高剖面的可解释性;利用分频技术得到的一系列频率切片比用常规振幅和相位切片在 捕获微小的横向变化和展现不同的沉积特征方面更加有效;歧南凹陷明化镇组下段为曲流河沉积，沙河街组一段为 辫状河三角洲沉积,其中曲流河沉积的地层切片展现出支流汇人干流、凹岸侵蚀、凸岸加积、截弯取直和牛轭湖等一 系列沉积微相特征;品质好的三维地震资料是地震沉积学的研究基础,在断层不发育的明化镇组河流相地区,应用 效果最好。 |
| 关键词: 地震沉积学 相位调整 分频技术 地层切片 歧南凹陷 |
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| 基金项目:国家“973"重点基础研究规划项目(2003CB214608) |
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| Study of seismic sedimentology in Qinan sag |
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DONG Yan-lei1,2,ZHU Xiao-min1,2,ZENG Hong-liu3,BIAN Shu-tao4,LIU Chang-li1,2,CHENG Ke-nan1,2,XU Xin-yu1,2
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(1. School of Resource and Information Technology in China University of Petroleum, Beijing 102249，CTuVia;2. Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education t China University of Petroleum,Beijing 102249, China ;3. Bureau of Economic Geology, Austin f Texas, U, S.，Austin 78713-8924;4. School of Energy Resource, China University of Geosciences, Beijing 100083, China)
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| Abstract: |
| In order to depict the depositional system of Qinan sag of Huanghua depression more accurately, seismic sedimento-logical studies were carried out through using three key technologies including phase shift, frequency division and strata! slicing. The results show that the 90。phasing of seismic data reconditions seismic traces to resemble impedance profiles，so that the interpretability of the data can be improved. The frequency division slices are more effective than the conventional amplitude and phase slices on capturing the tiny lateral changes and displaying the various depositional characteristics. The stratal slices of Minghuazhen formation are interpreted as meandering rivers and the slices of member 1 of Shahejie formation are interpreted as braided delta. A series of depositional characteristics can be displayed in the slices of meandering rivers, such as contributories affluxing into the main river, erosion in cut bank and aggradation in inner bank, cutoff and oxbow lake. 3D seismic data with good quality is the basis of the study of seismic sedimentology ? and Minghuazhen formation of the working area without too many faults, which is the fluvial depostional system, is suitable to develop the study of seismic sedimentology. |
| Key words: seismic sedimentology phase shift frequency division stratal slicing Qinan sag |
