【作者】 潘浪；

【导师】 魏贵民； 胡灿；

【作者基本信息】 成都理工大学 ， 应用数学， 2010， 硕士

【摘要】 随着油气勘探进入高勘探程度阶段,油气勘探逐渐由构造油藏转到地层岩性油藏。人们更加深刻地认识到浊积扇砂体以其有利的生储盖组合条件成为油田最具潜力的勘探目标之一。尽管这些油田中的湖相浊积岩储层还不是主要的油气产层,但随着沉积盆地油气勘探开发的深入,浊积岩油气藏的勘探对于中国油区的挖潜仍具有重要的现实意义,将是一个十分值得重视的油气勘探目标。利用地震相干体技术,我们可从地震资料中提取隐藏其间的多种有用信息,这为解决复杂地质体的储层描述提供了实用的分析手段。伴随着油田勘探开发走向成熟,岩性油藏逐渐成为主要勘探目标,在油田生产中占主导地位。本文将小波变换与地震相干体技术相结合,提出了用模拟地震子波的小波函数(或高分辨率导数小波函数)对原始三维地震记录体作小波变换,通过对不同品质的地震资料选取适当的小波参数及相干处理参数,可以得到不同通道的相干体;对相干体作切片可以得到不同通道的切片图像。达到提高解释的精度,实现地质异常体的精细解释,能使不同层次地质异常体都能清晰的展示出来。主要取得了以下一些成果和结论:1.将小波变换与地震相干属性分析技术相结合,通过对小波的中心频率、尺度因子等参数的确定,选取最优小波函数,利用小波域分频方法计算地震数据各个频带内的瞬时特征参数,结合算法计算各个频带内的地震相干数据体,从而得出浊积扇地震识别的新算法。2.将得到的新算法应用到实际的地震资料解释中,对QHD34-2-1井和QHD34-4-1井进行相干体连井剖面研究。从剖面图上可以看出SB32层位处湖底浊积扇砂体所处的环境具深水泥岩区的反射特点,外部形态主要呈楔状,透镜状等;内部反射结构为平行—亚平行、中强振幅,中低频、较连续的反射,在破折带下的槽洼地区,通常可见槽状充填反射,反映扇中水道下切较深的特点。3.最后用新算法对研究区东二段进行平面识别研究,与传统方法对比优劣。可以看出新算法识别的岩体特性与构造解释相吻合,证实了构造解释的合理性。证明了新算法的优越性。更多还原

【Abstract】 With the oil-gas exploration entering into the high exploration degree stage, the goal of oil-gas exploration changes gradually from the formation lithology oil deposit to the structural oil pool. The people realized profoundly that turbidite fan sand body and the advantageous combined condition of source-reservoir-seal assemblage become one of most potential exploration goals of oil field. With the thorough development of sedimentary basin oil-gas exploration, although lacustrine turbidite reservoir in these oil field is not the main oil gas production level, turbidite oil-gas reservoir exploration still has the vital practical meaning for Chinese the muddy product crag oil gas pool’s exploration regarding Chinese oil exploration, will be the oil-gas exploration goal which worth pay attention to.Using seismic attribute analysis technology,we can extract many kinds of useful information hidden in the seismic data,which also provides practical analysis method for the complex geologic body’s reservoir description.With oil-gas exploration becoming mature, lithologic reservoir gradually becomes the main exploration goal, and occupies the dominant position in the oil field production.Based on the understanding of the coherence technique principle and the wavelet transformation, this dissertation combining the wavelet transformation and the earthquake coherent attribute analysis technique, proposed that using the wavelet function of simulative seismic wavelet (or high resolution derivative wavelet function) made the wavelet transformation to the primitive three dimensional earthquake record body, obtained the respective channel’s earthquake record body of different resolution,and then use the coherent algorithm based on feature structure separately on three dimensional earthquake record body the different resolution.Through choosing the suitable wavelet parameter and the coherent processing parameter for different quality’s seismic data, the new algorithm can obtain the coherent bodies of different channel’s. Making the slice to the coherent bodies can obtain the different channel’s slice image. which can enhance the explanation precision, achieve the geologic anomaly body’s fine explanation, and enable the clear demonstration of the different level geologic anomaly body.The research results of this dissertation are summarized as follows:1. This paper combining the wavelet transformation and the earthquake coherent attribute analysis technique, through choosing the wavelet center frequency parameter, scale factor, the optimal wavelet function, we use wavelet territory frequency division method compute the earthquake data instantaneous characteristic parameter of each frequency band, and use the algorithm to calculate the earthquake coherent data body in each frequency band, then achieve the new algorithm of turbidite fan earthquake recognization.2. Will be the new algorithm is applied to actual seismic data interpretation, on the QHD34-2-1 well and QHD34-4-1 wells with well section of Coherence. Profile can be seen from the layer located at the bottom of the lake SB32 turbidite fan environment in which sand mud area with deep reflection characteristics of the main morphological wedge, lens, etc.; internal reflection structure parallel - sub parallel, the strong amplitude, low frequency, reflecting a more continuous, in breaking off the tank lying areas vaginal discharge, usually trough-like filling reflection can be seen, reflecting the fan in the watercourses have cut deep feature3. Finally, the new algorithm in the study area east Erduan for plane recognition, advantages and disadvantages compared with traditional methods. Demonstrates the new algorithm in identification of rock characteristics and structural interpretation is consistent, confirmed the structural interpretation is reasonable. Proved that the new algorithm.更多还原