川东北飞仙关组白云岩岩石结构演化.pdf

第24卷第5期
现代地质
2010年10月
CEOSCTENCE
c.2010
川东北飞仙关组白云岩岩石结构演化
杨博,蔡忠贤,赵文光
(1.甘肃省国土资源规划研究院,甘肃兰州730002.中西地质大学资源学院,湖北武汉430074;
3.中国石油勘探开发研究院,北京100083)
摘要:根据矿物结晶学理论,白云石可按照晶体大小和晶边形貌划分为不同的结构,其结构的演化主要受原岩化学组
成、岩石结构和白云岩化流体的影响。白云岩原岩可分为不同化学组分的泥灰岩和含颗粒泥灰岩,泥灰岩可细分为成
分均匀的和含溶孔、胶结物的泥灰岩;含颗粒泥灰岩可细分为未接受任何改造的、发生溶蚀胶结作用的和发生泥晶化
等作用的含颗粒泥灰岩。以川东北飞仙关组白云岩为例,在不同浓度的白云岩化流体条件中,讨论不同结构白云岩岩
石的演化。结果表明:泥晶化及溶蚀作用是白云石岩石结构演化和形成的基础;大多数气粒白云岩在低浓度白云岩化
溶液中形成:糖粒状白云岩为外来高浓度的白云岩化流体改造形成。
关键词:白云石晶体;结构演化;白云岩化流体;川东北
中图分类号:1TE122.2
文献标志码:A
文章编号:1000-8527(2010)05-0945-06
Evolution of Dolomite Crystal Textures in Feixianguan Formation of
the Northeast of Sichuan Basin China
YANG Bo, CAI Zhong-xian, ZHAO Wen-guang,
(l. Gansu Inste of and Resus Pa ng nd Res, L h, 730000 h 2. Facudy of Resources, China Uniersity of
Ceocines,Wuhan,Hhubei430074,Caina;3.ReseuchlasituegfPedoleuwmEwploralionandDeelopmena,PetroChina,Being1003,China)
Abstract Based on the nucleation and growth kinetics theory, the dolomite crystal can be classified according
to crystal size distribution and crystal munday shape The evolution of the crystal texture is controlled by the
chemical composition and extures of preexisting k and dolomitic luid. The preexisting rock can be classified
into muddy limestone and muddy limestone with grains. The muddy limestone is classified as the one with uni
form composition and the one with dissolved pore and cement. The muddy limestone with grains is classified as
that with no altemation, with suffered corrosion and with cementation and micritization. The dolomite crystal
textures in Feixianguan Formation of the NE Sichuan Basin can be cited to discuss the classification and evolu
tion of dolomite crystal textures in dolomitic fluid with dif erent concentration. The results show: (1 )the corr-
sion and micritization in preexisting rock is the base of classification and evolution of dolomite crystal textures
(2 )most of grains are replaced in dolomitic fluid with low concentration;(3)sucrosic dolomite is formed in for-
eign dolomitic fluid with high concentration
Key words: dolomite crystal; texture evolution; dolomitic fluid; northeast of Sichuan Basin
构分类是由 Sibley和Greg-所提出。广义的岩
石“结构”的特征包括:颗粒大小、晶体形态、边
目前,使用最广泛、最经典的白云岩岩石结界、大小、方位和堆积作用?。 Sibley和Wigh
收稿日期:2010-03-25:改回日期:2010-06-17;任编辑:孙义梅。
基金项目:闻家“973”项H(2005CB422105)。
作者简介:杨博,男,硕士研究生,1980年出生,能源地质工程专业,从事层序地层学与储层地质学研究。
Email:yangbo82717@yahoo.comcu
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