苏里格气田59区盒8段地震储层预测技术研究

发布时间：2018-01-13 17:08

本文关键词：苏里格气田59区盒8段地震储层预测技术研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着油气勘探开发的不断深入,致密砂岩气已显现出巨大的发展潜力,在弥补常规天然气的不足中扮演了重要角色。苏里格气田是中国储量最大且产量最高的致密砂岩气田,在致密砂岩气的研究中起到了重要的作用。苏59区位于苏里格气田西区,该区气藏分布受构造作用的影响较小,主控因素为砂体的横向展布以及储集层的非均质性。盒8段属于典型的致密砂岩岩性气藏,砂体横向分布较广但变化剧烈,纵向分布层次多但单砂体厚度相对较小,气、水关系复杂,地震资料低频缺乏,给储层预测精度的提高带来了较大的难度。本文以盒8段致密砂岩储层为目的层,综合利用该区的地质、地震、钻井、测井、录井等资料,采用波阻抗反演预测有利砂体的横向展布,采用地震属性预测有利砂岩含气区,综合上述结果进行分析,围绕有利储层预测展开研究,完成苏里格气田59区盒8段地震储层预测,取得了较好的预测效果。本次研究主要取得了以下成果:1、分析统计了不同类型井的测井响应特征,总结得出当储层的物性较好、含气量较高时具有低阻抗的特点,为采用波阻抗反演技术预测有利砂岩储层提供了依据。2、分析统计了不同类型井的储层地震响应特征,总结得出储层的含气性与振幅、频率的变化存在一定规律,为采用地震属性分析技术预测有利砂岩含气区提供了依据。3、采用波阻抗反演技术,充分利用了地震资料横向分辨率高和测井数据纵向分辨率高的特点,获得了盒8下段9100-10800g/cmcm3*m/s的低阻抗异常分布,有效地刻画出盒8下段有利砂岩储层的横向展布。4、对原始地震数据进行谱分解,获得不同频率段的单频地震数据,在此基础上分析了含气储层的低频伴影现象,计算了地层吸收剖面、低频瞬时振幅、高频衰减梯度,并对求取的地震属性进行了综合分析,有效地刻画出有利砂岩含气区的横向展布。5、将波阻抗反演结果与地震属性综合分析结果相结合,综合利用各方法的优点,最大限度地提高盒8下段有利储层的预测精度。
[Abstract]:With the deepening of oil and gas exploration and development, tight sandstone gas has shown great development potential. Sulige is the largest and most productive tight sandstone gas field in China. Su59 area is located in the western part of Sulige gas field, and the distribution of gas reservoir in Su59 area is less affected by tectonic action. The main controlling factors are the transverse distribution of sand body and the heterogeneity of reservoir. Section 8 belongs to typical tight sandstone lithologic gas reservoir. There are many vertical distribution layers, but the thickness of single sand body is relatively small, the relationship between gas and water is complicated, and the low frequency seismic data is lacking. It is difficult to improve reservoir prediction accuracy. In this paper, the tight sandstone reservoir of Section 8 is taken as the target layer, and the geological, seismic, drilling, logging, logging and other data are comprehensively used in this area. Wave impedance inversion is used to predict the transverse distribution of favorable sand body and seismic attribute is used to predict favorable sandstone gas bearing area. The above results are analyzed and the research is carried out around favorable reservoir prediction. The seismic reservoir prediction of Box 8 member in area 59 of Sulige gas field has been completed, and good prediction results have been obtained. The following results have been obtained in this study: 1, and the logging response characteristics of different types of wells have been analyzed and counted. It is concluded that when the reservoir has good physical properties and high gas content, it has the characteristics of low impedance, which provides a basis for the prediction of favorable sandstone reservoir by using wave impedance inversion technology. The seismic response characteristics of different types of wells are analyzed and analyzed. It is concluded that there are certain laws of gas bearing, amplitude and frequency variation of reservoirs. It provides a basis for prediction of favorable sandstone gas bearing area by seismic attribute analysis technology, and uses wave impedance inversion technology to make full use of the characteristics of high lateral resolution of seismic data and high vertical resolution of logging data. The low impedance anomaly distribution of 9100-10800g / cm / cm ~ (-3) m / s in the lower member of Bo8 is obtained, which can effectively depict the transverse distribution of favorable sandstone reservoirs in the lower member of Box 8. On the basis of the spectral decomposition of the original seismic data, the single frequency seismic data of different frequency segments are obtained. On this basis, the low frequency tracing phenomenon of the gas-bearing reservoir is analyzed, and the formation absorption profile and the instantaneous amplitude of the low frequency are calculated. The high frequency attenuation gradient and the obtained seismic attributes are analyzed synthetically, which can effectively depict the transverse distribution of favorable sandstone gas bearing area, and combine the inversion result of wave impedance with the comprehensive analysis result of seismic attribute. Using the advantages of each method, the prediction accuracy of the favorable reservoir in the lower member of Bo8 is improved to the maximum extent.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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