發(fā)布時(shí)間：2018-06-10 12:22

  本文選題：時(shí)頻分析 + FVO�。� 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：地震波傳播過(guò)程中的振幅、頻率和相位等動(dòng)力學(xué)特征會(huì)發(fā)生變化,這些變化可以用來(lái)表征地下地層的儲(chǔ)層地質(zhì)信息。疊前地震道集不僅保留了地震記錄隨炮檢距變化的特性,還保留了大量橫波信息,能為巖性辨別和流體探測(cè)提供更豐富、準(zhǔn)確的依據(jù)。針對(duì)疊前地震屬性的研究已成為儲(chǔ)層流體探測(cè)領(lǐng)域的研究熱點(diǎn)之一。時(shí)頻分析技術(shù)的發(fā)展使得精確研究地震記錄的頻譜信息成為可能。S變換是一種變分辨率時(shí)頻分析方法,并且保持了與傅立葉變換的直接關(guān)系,與頻率可以直接對(duì)應(yīng)。在高頻段擁有較高的時(shí)間分辨率,在低頻段擁有較高的頻率分辨率。利用S變換分析地震數(shù)據(jù),能很好地滿足地震數(shù)據(jù)分析的要求。本文基于地震波傳播過(guò)程中,經(jīng)過(guò)含有流體的地層后,頻率隨炮檢距變化的現(xiàn)象,以及地層對(duì)地震信號(hào)頻率響應(yīng)的影響,研究了基于疊前地震道集的FVO(Frequency Versus Offset)分析方法。FVO分析方法主要包括FVO正演方法,即利用不同儲(chǔ)層巖性模型的FVO響應(yīng),建立區(qū)分不同流體的FVO檢測(cè)標(biāo)志;以及FVO儲(chǔ)層反演方法,即利用S變換提取實(shí)際地震記錄中的FVO響應(yīng),以此估算地層巖體的地震參數(shù),進(jìn)行油氣藏描述。本論文利用三層水平模型進(jìn)行正演,得到含氣和含水儲(chǔ)層FVO檢測(cè)標(biāo)志;利用S變換提取分角度疊加的疊前地震道集頻率衰減梯度,結(jié)合不同流體FVO檢測(cè)標(biāo)志進(jìn)行儲(chǔ)層預(yù)測(cè)。通過(guò)理論驗(yàn)證和實(shí)際資料驗(yàn)證了FVO分析方法進(jìn)行儲(chǔ)層預(yù)測(cè)的可行性。
[Abstract]:The amplitude, frequency and phase of seismic wave will change in the process of seismic wave propagation. These changes can be used to represent the reservoir geological information of underground strata. The prestack seismic gathers not only retain the characteristics of seismic records varying with offset, but also retain a large amount of S-wave information, which can provide a richer and more accurate basis for lithologic discrimination and fluid detection. The study of prestack seismic attributes has become one of the hotspots in the field of reservoir fluid exploration. With the development of time-frequency analysis technology, it is possible to study the spectrum information of seismic records accurately. S transform is a variable resolution time-frequency analysis method, and it maintains the direct relation with Fourier transform and can correspond to frequency directly. It has higher time resolution in high frequency band and higher frequency resolution in low frequency band. Using S transform to analyze seismic data can well meet the requirements of seismic data analysis. This paper is based on the phenomenon that the frequency varies with the offset during the seismic wave propagation, and the influence of the formation on the frequency response of the seismic signal. The FVO analysis method based on prestack seismic gather is studied. The FVO analysis method mainly includes the FVO forward modeling method, that is, using the FVO response of different reservoir lithologic models to establish the FVO detection mark to distinguish different fluids, and the FVO reservoir inversion method. The S-transform is used to extract the FVO response from the actual seismic records to estimate the seismic parameters of the strata and rock mass and to describe the oil and gas reservoirs. In this paper, the FVO detection mark of gas-bearing and water-bearing reservoirs is obtained by using the three-layer horizontal model, and the frequency attenuation gradient of prestack seismic gather is extracted by S transform, and the reservoir prediction is carried out by combining the FVO detection criteria of different fluids. The feasibility of FVO analysis method for reservoir prediction is verified by theoretical verification and practical data.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.4

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本文編號(hào)：2003206