页岩气储层总孔隙度与有效孔隙度测量及测井评价——以四川盆地龙马溪组页岩气储层为例

发布时间：2018-01-17 14:10

本文关键词：页岩气储层总孔隙度与有效孔隙度测量及测井评价——以四川盆地龙马溪组页岩气储层为例　出处：《石油与天然气地质》2017年03期 　论文类型：期刊论文

【摘要】：在地层束缚水条件下,对页岩气储层有效孔隙度理解及测量方法尚无统一标准,由此造成同一样品的孔隙度测量结果显著差异,给储层评价带来困难。对来自四川盆地龙马溪组页岩气储层的平行岩心样品分别依据GRI和SY/T 5336—2006标准进行总孔隙度和有效孔隙度测量,并配套进行岩矿组分、粘土组分和有机碳含量(TOC)测量。通过实验数据分析认为,页岩气储层总孔隙度和有效孔隙度测量结果两者相差1~3倍,造成差异的根本原因是对与粘土有关的束缚水体积不同的处理方式;页岩气储层中充气孔隙度与TOC呈高度正相关关系,相关系数达到0.9以上,表明有机孔隙是页岩气储层中有效孔隙的主要贡献者;束缚水孔隙与粘土矿物含量呈现良好正相关关系,表明与粘土有关的微细孔隙被束缚水占据,为无效孔隙。基于上述认识,构建了有效孔隙定量关系。同时,基于干粘土体积模型建立了总孔隙度评价方法,利用测井资料确定了实际地层的总孔隙度和有效孔隙度。应用表明,测井评价结果与不同实验室测定的总孔隙度和有效孔隙度吻合较好。
[Abstract]:Under the condition of formation bound water, there is no uniform standard for understanding and measuring effective porosity of shale gas reservoir, which results in significant difference of porosity measurement results of the same sample. The parallel core samples from the shale gas reservoir of Longmaxi formation in Sichuan Basin are based on GRI and SY/T, respectively. The total porosity and effective porosity were measured by 5336-2006 standard. The rock and mineral components, clay components and organic carbon content were measured by TOC. Through the analysis of experimental data, it is concluded that the difference between the total porosity and effective porosity of shale gas reservoir is 1 or 3 times. The root cause of the difference is the treatment of different volume of bound water related to clay; There is a highly positive correlation between aeration porosity and TOC in shale gas reservoir, and the correlation coefficient is more than 0. 9, which indicates that organic porosity is the main contributor of effective porosity in shale gas reservoir. There is a good positive correlation between the bound water porosity and the clay mineral content, which indicates that the micro-pores related to clay are occupied by the bound water and are invalid pores. Based on the above understanding, the effective pore quantitative relationship is constructed. At the same time. Based on the dry clay volume model, the total porosity evaluation method is established, and the total porosity and effective porosity of the actual formation are determined by using the logging data. The results of log evaluation are in good agreement with the total porosity and effective porosity measured in different laboratories.
【作者单位】：中国石化石油勘探开发研究院;页岩油气富集机理与有效开发国家重点实验室;
【基金】：国家科技重大专项(2016ZX05060001-012)
【分类号】：P618.13;P631.81
【正文快照】： 孔隙度是储层岩石的固有性质,也是油气储层评价的基础参数。对于传统砂岩储层来说,孔隙度测量技术是成熟技术,不同商业实验室测量结果一致性较好,测量精度值得信赖。但对页岩气储层来说,则不然:由不同实验室或不同方法对同一样品的孔隙度测量结果差异大,其差异可达1~3倍[1],岩

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