학술논문
页岩气储层岩石孔隙特征对岩石密度作用机理探究 / Research on Influence of Porosity of Shale Gas Reservoir on Rock Density
Document Type
Academic Journal
Author
赵子斌; 侯读杰; 陈皓禹; 程熊; 董立成; 贾智彬; Zhao Zibin; Hou Dujie; Chen Haoyu; Chen Xiong; Dong Licheng; Jia Zhibin
Source
科技通报 / Bulletin of Science and Technology. 33(10):23-28
Subject
Language
Chinese
ISSN
1001-7119
Abstract
利用页岩气储层岩石密度等信息反演储层孔隙类型等发育特征,在页岩气储层评价过程中有重要意义.研究通过岩石各组分含量加权计算岩石密度,具体地分析了北美的几套热演化成熟的页岩气有利层系的孔隙度及孔隙类型与密度间关系,分析影响岩石密度的因素,得出了(1)相同或相近孔隙度的具"有机孔"优势岩石呈现出高相对密度,"凝絮孔"等其他无机孔隙优势的岩石呈现出低相对密度;(2)具相同孔隙类型优势的岩石密度随着孔隙度的增大而降低;(3)具不同孔隙类型优势的岩石对比中,随孔隙度增大"有机孔"优势岩石比具其他类型优势孔隙的岩石密度低,反之则高.这些结论可为快速大致判断新区新井目的层位孔隙发育特征提供思路.
It is significant for inversion of characteristic of pores to use density of shale/mudstone in shale gas reservoir evaluation. Density of shale/mudstone were calculated by each mineral percent contents. The correlation among mineral composition, porosity and density were specifically analysed, reaching the factors that affected the rock density. The results show that (1) shale gas reservoir rocks that holding advantage of organic-pores appears higher density than other types of pores with similar porosity; ( 2) density of rocks with same type of pores decrease with the increase of porosity; (3) whereas in the comparison of holding various types of pores, density of rocks with advantage of organic-pores decreases faster than other types of pores when porosity decreases. These conclusions may provide a method to estimate and judge the characteristics of pores in target strata roughly and fast.
It is significant for inversion of characteristic of pores to use density of shale/mudstone in shale gas reservoir evaluation. Density of shale/mudstone were calculated by each mineral percent contents. The correlation among mineral composition, porosity and density were specifically analysed, reaching the factors that affected the rock density. The results show that (1) shale gas reservoir rocks that holding advantage of organic-pores appears higher density than other types of pores with similar porosity; ( 2) density of rocks with same type of pores decrease with the increase of porosity; (3) whereas in the comparison of holding various types of pores, density of rocks with advantage of organic-pores decreases faster than other types of pores when porosity decreases. These conclusions may provide a method to estimate and judge the characteristics of pores in target strata roughly and fast.