白音查干凹陷达尔其地区沉积相模型及地震反射特征研究

发布时间：2018-04-16 03:28

本文选题：达尔其地区 + 腾格尔组　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：地震体中含有很多的地质信息,如何更好的开发利用,一直是一个热点与难点。本次论文主要通过工区的测录井资料,研究工区沉积微相,在划分单一微相的基础上,对同一沉积时期内沉积微相组合进行研究,并通过研究达尔其工区的地震反射特征,找出沉积微相组合与地震反射特征的对应关系。达尔其地区位于白音查干凹陷南部斜坡北端,主要发育有辫状河三角洲沉积相,微相为河口坝、河道间、席状砂及水下辫状河道。对于工区的地震反射特征研究发现,工区缓坡带发育的滨浅湖相具有中强振幅、中等连续特征,频率受深度影响会有变化。当水体变深时,从滨浅湖相转向半深湖一深湖相,表现出振幅增强、频率降低且连续性增高的趋势。河道相表现为中振幅、低连续特征,反映砂体侧向分布局限。辫状河三角洲前缘相对应高频、中强振幅地震相。根据测录井资料,对工区的地质模型主要分了六种,在对D24区块的具体研究中发现,沉积微相组合模式不同,其振幅值大小也不同,其中河口坝+河道间组合及河口坝+河道间+席状砂组合模式的振幅值较大,振幅值主要取决于砂泥互层发育情况。工区频谱类型主要发育单峰、双峰及多峰。单峰的地震相较为单一,在上下两条主要的延伸较长的同向轴之间没有多余的振幅较为明显的同向轴,而双峰和多峰的在两条顶界底界同向轴之间还发育有其它的振幅较明显的同向轴。振幅值较大时,频谱图中会发育一个明显的主峰。
[Abstract]:Seismic body contains a lot of geological information, how to better development and utilization, has been a hot and difficult point.In this paper, the sedimentary microfacies in the working area are studied by logging data. On the basis of dividing the single microfacies, the combination of sedimentary microfacies in the same sedimentary period is studied, and the seismic reflection characteristics of the Dalki area are studied.The relationship between sedimentary microfacies combination and seismic reflection characteristics is found out.The Dalki area is located at the northern end of the southern slope of Baiyinchagan sag. There are mainly braided river delta sedimentary facies. The microfacies are estuarine dam, interchannel, sheet sand and underwater braided channel.It is found that the shallow lacustrine facies developed in the gentle slope zone of the working area have moderate amplitude, medium continuity, and the frequency will be affected by depth.When the water becomes deeper, it turns from the shallow littoral lake to the semi-deep lake to the deep lake, which shows the trend of increasing amplitude, decreasing frequency and increasing continuity.The channel facies is characterized by medium amplitude and low continuity, reflecting the limitation of lateral distribution of sand body.The braided river delta front phase corresponds to high frequency and medium strong amplitude seismic facies.According to the logging data, the geological models of the working area are mainly divided into six types. In the specific study of block D24, it is found that the amplitude of the sedimentary microfacies assemblage model is different,The amplitudes of the interchannel assemblage of estuarine dam and the sheet sand assemblage of estuarine dam are relatively large, and the amplitude mainly depends on the development of sand and mud interbed.Single peak, double peak and multi-peak are the main spectrum types in the working area.The single peak seismic phase is relatively single, and there is no obvious coaxial amplitude between the two main extending coaxial lines.However, there are other coaxial amplitudes between the two top boundary and the bottom boundary of the double peak and the multi-peak.When the amplitude value is larger, there will be an obvious main peak in the spectrum map.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.4

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