摘要
泥质质量分数是指示碎屑岩岩性变化的重要指标,其对岩石物性及弹性性质均具有重要影响。对于深层致密油储层,准确预测地层岩性变化尤为重要。文中以塔中X井区孔隙型海相致密碎屑岩地层为研究对象,利用孔弹性Biot理论获取地层岩石弹性参数,重点探讨了孔隙纵横比(α)对地层岩性变化点的指示作用。目的层的基质矿物体积模量(K_o)主要分布在20-60 GPa,基质矿物剪切模量(μ_o)主要分布在10~25 GPa;随着泥质质量分数(V_(sh))的增加,孔隙型岩石的α值逐渐降低,具有分段性,砂岩的α值分布在0.25-1.00,泥岩的α值分布在0.01~0.25;岩性转折点所对应的α值为0.25,Vsh为40%,岩石体积模量(K_s)为40 GPa,孔隙度(ф)为3%,转折端孔隙度可以为储层物性下限的确定提供参考。
The content of clay is an important index to indicate the change of clastic rocks, and it has important influence on the physical properties and elastic properties of rocks. Taking the pore type marine tight clastic rock stratum in the X well area of the Tazhong as the research object, the elastic parameters of the stratum are obtained with the Biot theory and the indication of the α to the change of the formation lithology is discussed. The main ideas are as follows: K_o is mainly distributed in 20-60 GPa, and μ_o is mainly distributed in 10-25 GPa; with the increase of V_(sh), the α value of the porous rock gradually decreases, the α value of sandstone in 0.25-1.00, and the α value of the mudstone in 0.01-0.25; at the turning point, α=0.25, V_(sh)=40%, K_s=40 GPa, ф=3%, the porosity of the turning point can provide a reference for determining the lower limit of reservoir physical properties.
出处
《断块油气田》
CAS
北大核心
2016年第6期731-737,共7页
Fault-Block Oil & Gas Field
基金
国家自然科学基金项目"渤海湾盆地济阳坳陷古近系陆相富有机质页岩裂缝研究"(41372139)
"中国南方下古生界海相富有机质页岩裂缝发育程度与主控因素定量关系研究"(41072098)
国家科技重大专项课题"煤系地层游离气富集规律分布与研究"(2011ZX05033-004)
国家科技重大专项专题"渤海湾盆地页岩气资源评价"(2011ZX05018-001-002)
"致密油有效开发机理与关键技术"(2016ZX05046-003-001)
关键词
孔隙纵横比
孔隙型
海相
致密油
岩性
方法
pore aspect ratio
pore type
marine facies
tight oil
lithology
method
作者简介
曹翔宇,男,1991年生,在读硕士研究生,矿产普查与勘探专业。主要从事石油构造分析与控油作用、非常规油气构造和裂缝及其与含气量关系研究。E—mail:1549429281@qq.com。