青海省三露天天然气水合物储层测井解释方法研究

发布时间：2018-04-09 15:59

本文选题：三露天井田　切入点：冻土区　出处：《中国地质大学(北京)》2015年硕士论文

【摘要】：天然气水合物作为储量巨大的潜在替代能源一直备受关注。而青海省祁连山冻土区作为世界上第一个发现天然气水合物的中纬度高山冻土区,对其的勘探开发已成为热点问题。由于天然气水合物的自身物理性质及其对储层岩石物理性质的影响,对电阻率、声波速度、密度等地球物理测井响应均产生一定异常,使其成为识别天然气水合物储层的有效标志。影响天然气水合物的资源量的物性参数包括储层的分布范围、厚度、孔隙度以及水合物的饱和度,而其又与地层常规测井参数具有直接的对应关系,因此研究天然气水合物储层的测井响应特征对其勘探开发具有重要意义。本文基于钻探解释和测井岩性识别结果,综合利用青海省三露天多口天然气水合物钻孔的常规测井和超声波成像测井资料,分别总结了研究区裂隙型和孔隙型水合物储层的测井响应特征,并将其与国内外天然气水合物储层的典型测井响应特征进行对比分析;基于研究区两类储层测井响应特征,提出了其各自的储层测井识别方法;总结归纳了国内外现有的多种水合物储层参数计算方法,并对储层识别与参数计算方法在本研究区的应用效果进行了分析。研究结果表明:(1)裂隙型水合物储层比纯泥岩层段的裂隙更发育;声波速度较高,范围为1.5~4.5km/s;电阻率最高可达90Ω.m。孔隙型水合物储层比砂岩水层的声波速度高,范围为2.0~4.0km/s;电阻率亦为高值,范围为90~180Ω.m。(2)确定了两类储层各自的测井识别方法,即利用常规测井和超声波成像测井资料识别裂隙型水合物储层,利用电阻率和声波速度测井曲线重叠法识别孔隙型水合物储层,且识别结果表明其应用效果较好。(3)众多储层参数计算方法中,基于岩心资料,利用密度与自然伽马测井数据回归孔隙度的评价效果最好;简化的阿尔奇公式对含水合物饱和度的评价效果最好。
[Abstract]:As a potential alternative energy source with huge reserves, natural gas hydrate has attracted much attention.As the first high altitude permafrost region in the world where natural gas hydrate is found in Qilian Mountain, Qinghai Province, the exploration and development of gas hydrate has become a hot issue.Due to the physical properties of natural gas hydrate and its influence on the physical properties of reservoir rocks, the geophysical logging responses such as resistivity, acoustic velocity and density are abnormal.It is an effective sign to identify gas hydrate reservoir.The physical parameters affecting the amount of natural gas hydrate resources include the reservoir distribution range, thickness, porosity and hydrate saturation, which are directly corresponding to the conventional logging parameters.Therefore, it is important for exploration and development to study the logging response characteristics of gas hydrate reservoir.Based on the results of drilling interpretation and logging lithology identification, the conventional logging and ultrasonic imaging logging data of gas hydrate drilling in three open spaces in Qinghai Province are synthetically used in this paper.The logging response characteristics of fractured and porous hydrate reservoirs in the study area are summarized, and compared with the typical logging response characteristics of natural gas hydrate reservoirs at home and abroad.This paper puts forward their respective methods of reservoir logging identification, summarizes the existing calculation methods of hydrate reservoir parameters at home and abroad, and analyzes the application effect of reservoir identification and parameter calculation methods in this study area.The results show that the fissure hydrate reservoir is more developed than the pure mudstone formation, the acoustic velocity is higher, the range is 1.5 ~ 4.5km / s, and the resistivity is up to 90 惟路m ~ (-1).The sonic velocity of the porous hydrate reservoir is higher than that of the sandstone reservoir, the range is 2.0 ~ 4.0 km / s, and the resistivity is also high, and the range is 90 ~ 180 惟路m ~ (-2).In other words, the conventional logging and ultrasonic imaging logging data are used to identify the fractured hydrate reservoir, and the overlap method of resistivity and acoustic velocity logging curve is used to identify the porous hydrate reservoir.The recognition results show that among the many reservoir parameter calculation methods, the density and natural gamma logging data are the best to evaluate the porosity based on the core data.The simplified Archie formula is the best in evaluating hydrate saturation.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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