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多尺度数学形态学在多次波压制中的应用
Application of multi-scale mathematical morphology in multiples suppression
王 江1 党 萱2 王重阳2 张 宏1 王 杰1
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DOI:10.12055/gaskk.issn.1673-3177.2017.03.008
作者单位:1. 大庆油田有限责任公司勘探开发研究院
中文关键字:呼和湖断陷 早白垩世 煤系地层 多尺度数学形态学 多次波动校正 多次波压制 地震频带
英文关键字: Huhehu fault depression; Early Cretaceous; Coal measure strata; Multi-scale mathematical morphology; Multiples moveout correction; Multiples suppression; Seismic frequency band
中文摘要:

呼和湖断陷是海拉尔盆地中的聚煤凹陷之一,具有良好的煤成气勘探开发潜力。主要煤系地层下白垩统大磨拐河组和南屯组的煤层与砂岩、泥岩交互发育,煤层厚度大部分小于1/4地震波长,致使地震资料层间多次波发育,其能量强、分布范围广且速度与一次反射波相近。常规处理方法对多次波压制效果不佳,满足不了精细构造和岩性解释需求。因此,根据多次波在形态和尺度上与有效波的差异,利用其在视速度方向上的大尺度特征,在经过多次波动校正的共中心点(CMP)道集上去除多次波,获得了高质量的CMP 道集数据和叠前时间偏移成果,突出了有效波细节信息,地层反射特征清楚,接触关系清晰,断点干脆。在呼和湖断陷的应用实例表明,通过数学形态学多次波压制,地震剖面的分辨率得到明显提高,主要目的层南屯组地震数据主频由原(2025 Hz 提高到(2530Hz,频带也拓宽至(652Hz




英文摘要: The Huhehu fault depression, as one of coal accumulating depressions in the Hailar Basin, presents good potential for exploration and development of coal formed gas. In the main coal measure strata, the coal beds of Damoguaihe and Nantun Formations of Lower Cretaceous are developed alternatively with sandstones and mudstones. The thickness of coal beds is mostly less than a quarter of the seismic wave length, resulting in the existence of multiple waves between seismic data layers. Multiple wave is distributed in the large area, its energy is strong and its velocity is close to that of primary reflection wave. Therefore, the conventional processing method cannot suppress the multiple waves well, and cannot meet the requirements of fine structure and lithology interpretation. In this paper, the differences of morphology and size between multiple waves and effective waves were investigated, and the multiple waves on the CMP (common mid-point) gather which is processed with multiples moveout correction were removed by using its large-scale characteristics in the direction of apparent velocity. Thus, high-quality CMP gather data and pre-stack time migration results were obtained, and the detailed information of effective waves were highlighted. As a result, the reflection characteristics of strata are clear, the contact relationship is distinct, and the break point is defined. Field application in the Huhehu fault depression shows that the resolution of seismic profile is increased significantly by applying the mathematical morphology to the multiples suppression. The main frequency of seismic data is increased from 20-25 Hz to 25-30Hz, and the bandwidth is broadened to 6-52 Hz in the Nantun Formation.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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