莫里青复杂砂砾岩储层测井饱和度评价方法

发布时间：2018-05-26 02:24

本文选题：伊通莫里青 + 岩性识别　；参考：《东北石油大学》2016年硕士论文

【摘要】：伊通盆地位于吉林省东部,此盆地沉降幅度很大,盆地两侧物源充足,沉积速率快相变快。主要研究区块莫里青断陷为伊通盆地的一个沉积环境特殊岩性复杂的一个二级构造单元。水下扇是莫里青断陷砂体发育的主要类型,在岩性上主要表现为粒径粗分选差,岩性相对单一,孔隙结构较好的中扇区主要以砂砾岩、含砾砂岩、粉砂岩为主;颗粒较细、泥质含量高的的低孔低渗特征明显的含泥或含钙粉砂岩等。论文以岩心录井资料为基础,在常规测井资料综合标定的基础上,通过交会图分析实现对研究区划分的五类岩性的物性与含油性的分析。同时针对典型岩性进行测井响应分析,研究各条曲线的测井响应特征,对于不同岩层的反应能力与变化趋势,通过五大岩类的物性含油性分析结合主要影响岩性识别的测井曲线值通过交会图分析、贝叶斯聚类判别分析等技术建立判别函数,完成五种主要岩性的测井资料岩性识别,并且有较高的识别符合率。由于莫里青断陷储层岩性复杂,砂砾岩储层岩石骨架电阻率高,油、水层均表现为较高的视电阻率,粉砂岩储层又常表现为高含钙、高含泥、非均质性强,因此从传统意义上来应用阿尔奇公式计算含水饱和度的方法,很难得到好的计算结果。为了解决以上问题,通过分岩性的方法建立地层因数与有效孔隙度的关系式,从而确定不同岩性的岩性系数a与孔隙指数m;在确定饱和度指数n时,由于孔渗条件的复杂性,必须要考虑到岩样自身的孔渗特征对驱替过程产生的影响,也就是考虑孔喉半径这个影响因素,论文通过大量实验研究确立了含水饱和度与电阻率增大系数的关系并且形成由平均孔喉半径计算饱和度指数n的关系式,相关性比较高,最后通过密闭取心井饱和度分析资料进行方法验证,取得的效果较好。
[Abstract]:The Yitong Basin is located in the east of Jilin Province. The Morri fault depression is a secondary tectonic unit with complex lithology and special sedimentary environment in the Yitong basin. The subaqueous fan is the main type of sand body development in the Qingqing fault depression of Morri. The lithology of the subaqueous fan is mainly composed of sandy gravel, gravel sandstone, siltstone and fine grain, which is characterized by poor grain-size coarse sorting, relatively simple lithology and good pore structure. The characteristics of low porosity and low permeability with high shale content are obvious mud or calcium-bearing siltstone and so on. On the basis of core logging data and on the basis of comprehensive calibration of conventional logging data, the physical properties and oil-bearing properties of five types of lithology in the study area are analyzed by cross plot analysis. At the same time, the logging response of typical lithology is analyzed, and the logging response characteristics of each curve are studied, and the response ability and variation trend of different rock layers are studied. Through the petrophysical analysis of the five major rock types and the logging curve value which mainly affects the lithology identification, the discriminant function is established by means of cross plot analysis, Bayesian clustering discriminant analysis and so on, and the lithology identification of the logging data of the five major lithology is completed. And there is a higher recognition coincidence rate. Because of the complex lithology of Morri fault depression reservoir, the rock skeleton resistivity of sandy gravel reservoir is high, the oil and water layers are all high apparent resistivity, and the siltstone reservoir is often characterized by high calcium content, high mud content and strong heterogeneity. Therefore, it is difficult to obtain good results by using Archie formula to calculate water saturation in traditional sense. In order to solve the above problems, the relationship between formation factor and effective porosity is established by the method of lithology, so as to determine the lithology coefficient a and porosity index m of different lithology, because of the complexity of pore and permeability conditions when determining saturation exponent n, We must take into account the influence of the pore and permeability characteristics of rock samples on the displacement process, that is, the influence factor of pore throat radius. In this paper, the relationship between water saturation and resistivity increase coefficient is established through a lot of experimental studies, and the relation formula of saturation exponent n calculated from average pore throat radius is obtained. The correlation is relatively high. Finally, the method is verified by the saturation analysis data of closed coring well.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13;P631.81

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