粒度资料计算碎屑岩油藏束缚水饱和度新方法
A new method for calculating irreducible water saturation of clastic rocks reservoir from granularity data
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- 引用格式:
-
康志勇,尚策,丁群,唐海龙.粒度资料计算碎屑岩油藏束缚水饱和度新方法[J].天然气与石油,2022,40(5):81-89.doi:10.3969/j.issn.1006-5539.2022.05.012
KANG Zhiyong, SHANG Ce, DING Qun, TANG Hailong.A new method for calculating irreducible water saturation of clastic rocks reservoir from granularity data[J].Natural Gas and Oil,2022,40(5):81-89.doi:10.3969/j.issn.1006-5539.2022.05.012
- DOI:
- 10.3969/j.issn.1006-5539.2022.05.012
- 作者:
- 康志勇1 尚策1 丁群2 唐海龙1
KANG Zhiyong1, SHANG Ce1, DING Qun2, TANG Hailong1
- 作者单位:
- 1. 中国石油辽河油田公司勘探开发研究院, 辽宁 盘锦 124010; 2. 中国石油冀东油田公司勘探开发部， 河北 唐山 063004
1. Research Institute of Exploration and Development, PetroChina Liaohe Oilfield Company, Panjin, Liaoning, 124010, China; 2. Exploration and Development Department, PetroChina Jidong Oilfield Company, Tangshan, Hebei, 063004, China
- 关键词:
- 碎屑岩粒度分析;束缚水饱和度方程;比表面积;水膜厚度;质量分数;岩石体积密度;全岩X衍射;黏土矿物
Grain size analysis of clastic rocks; Irreducible water saturation equation; Specific surface area; Water film thickness; Mass fraction; Rock bulk density; Whole rock X-ray diffraction; Clay minerals
- 摘要:
岩心实验分析法、经验公式法和测井解释法是目前确定碎屑岩油藏束缚水饱和度的主要方法。由于成本等因素,多数评价单元都无条件用岩心实验分析法获取束缚水饱和度,只能采用精度相对较低的经验公式法或测井解释法求取。针对这一问题,在分析碎屑岩油藏束缚水饱和度形成机理的基础上,采用碎屑岩粒度、碎屑岩体积密度、黏土矿物含量、全岩X衍射等分析项目,确定碎屑岩比表面积和碎屑颗粒表面水膜厚度等参数求取碎屑岩束缚水饱和度。由此建立了以碎屑岩颗粒直径、碎屑颗粒质量分数、岩石体积密度及黏土矿物质量分数等参数为基础的束缚水饱和度方程。采用该方程解释评价单元束缚水饱和度的精度高于测井解释法得出的精度,与岩心实验分析法中岩心间接分析法确定结果精度相当。该方程揭示了碎屑岩束缚水饱和度与水膜厚度和比表面积的乘积成正比,与岩石总孔隙度成反比,这一认识奠定了碎屑岩束缚水饱和度评价的理论基础，对低成本、高精确度确定碎屑岩束缚水饱和度具有现实意义。
Core experimental analysis method, logging interpretation method and empirical formula method are the main methods to determine the irreducible water saturation of clastic rock reservoir. Due to cost and other factors, most evaluation units are unable to obtain irreducible water saturation with core analysis method, which can only be obtained by logging interpretation method or empirical formula method with relatively low accuracy. To solve this problem, based on the analysis of the formation mechanism of irreducible water saturation in clastic rock reservoir, the specific surface area of clastic rock and the surface water film thickness of clastic particles are determined using the analysis items such as clastic rock particle size, clastic rock bulk density, clay minerals and whole rock X-ray diffraction. The irreducible water saturation equation based on the parameters of clastic rock particle diameter, clastic particle mass fraction, rock bulk density and clay mineral mass fraction is established. The accuracy of using this equation to explain the irreducible water saturation of the evaluation unit is higher than that by logging interpretation method, and is equivalent to that determined by core indirect analysis method in core experimental analysis. The equation reveals that the irreducible water saturation of clastic rocks is directly proportional to the product of water film thickness and specific surface area, and inversely proportional to the total porosity of rocks, which lays a theoretical foundation for the evaluation of irreducible water saturation of clastic rocks. The study has practical implications for the determaination of irreducible water saturation of clastic rock with lower costs and high precision.
