利用长、短旋回波形分析法去除地震强屏蔽

发布时间：2018-05-06 20:31

  本文选题：Wheeler变换 + 子体波形主成分分解　； 参考：《石油地球物理勘探》2017年05期

【摘要】：基于地震沉积学准层状地层,提出了一个对应的阻抗模型,其地震信号可视为长、短旋回的组合反射。长旋回具有低频、连续和相位稳定的特征,短旋回则相反。地震的强轴屏蔽可理解为长旋回背景,被屏蔽的砂体则为短旋回信息。采用一种基于长、短旋回波形分析方法去除强屏蔽的影响,通过Wheeler正、反变换、子体波形主成分分解、短旋回分频显示等构成长、短旋回分析技术流程,达到去除屏蔽、识别薄砂层的目的。利用正演模型试验,论证了算法的正确性和可行性;应用上述流程识别了松辽盆地北部强屏蔽T2之下的砂体信息,经主成分分解后的振幅切片反映了两条从南向北展布的浅水三角洲前缘沉积体,证实上述流程具有较好的去强屏蔽效果,对于其他具有屏蔽特征或相似地质条件的储层(例如煤层)描述具有借鉴价值。
[Abstract]:Based on the quasi stratiform seismic sedimentology, a corresponding impedance model is proposed, in which the seismic signal can be regarded as a combination reflection of long and short cycles. Long cycles are characterized by low frequency, continuity and phase stability, while short cycles are opposite. The strong axis shield of earthquake can be understood as a long cycle background, and the shielded sand body is a short cycle information. A method based on long and short cycle waveform analysis is adopted to remove the influence of strong shielding. The long and short cycle analysis technology flow is achieved by Wheeler forward, inverse transformation, principal component decomposition of sub-waveform, and short cycle frequency division display. The purpose of identifying thin sand beds. The correctness and feasibility of the algorithm are demonstrated by the forward modeling test, and the sand body information under strong shielding T2 in the north of Songliao Basin is identified by the above procedure. The amplitude slice after principal component decomposition reflects two shallow water delta front sedimentary bodies distributed from south to north. It is proved that the above process has a good effect of strong shielding. It can be used for reference to other reservoirs (such as coal seam) with shielding characteristics or similar geological conditions.
【作者单位】： 中国石油大庆油田有限责任公司;中国石油大庆油田有限责任公司勘探事业部;
【基金】：国家重大科技专项“大型油气田及煤层气开发”(2011ZX05001-001-004) 中国石油天然气股份公司重大科技专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(2012E-2603)联合资助
【分类号】：P631.4
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本文编号：1853766