胜利油田火山岩辉石中岩浆包裹体成分及有关成因问题  

Composition and Significance of Magmatic Inclusions in Pyroxenes of Volcanic Rocks from the Shengli Oilfield, China

作　　者：赫英[1] 朱兴国[1] 廖永胜[2] 徐培苍 刘文峰[3] 王志海 

机构地区：[1]西北大学地质系,西安710069 [2]胜利石油管理局地质研究院,山东东营257015 [3]中国地质调查局西安地质矿产研究所,710054

出　　处：《地质论评》2000年第6期638-644,共7页Geological Review

基　　金：国家973项目 (编号G1999043211);国家自然科学基金 (编号49573186;49972034)

摘　　要：对胜利油田火山岩中辉石及其中岩浆包裹体成分的研究表明:CO_2气藏区和非CO_2气藏区新生代火山岩辉石及其中岩浆包裹体成分有明显区别,前者中辉石为普通辉石,成分相对富SiO_2,而贫Al_2O_3、TiO_2、MgO和挥发份;而后者中辉石为透辉石,成分相对贫SiO_2和挥发份,而富Al_2O_3、TiO_2和MgO。前者岩浆包裹体玻相中富含CO_2,包裹体中的金属子矿物多为黄铁矿;而后者岩浆包裹体玻相中贫CO_2,包裹体中的金属子矿物多为锐钛矿。和辉石的成分相比,岩浆包裹体玻相成分中富集Al_2O_3、Na_2O、K_2O和挥发份;而和棕色玻相相比,岩浆包裹体无色玻相富Al_2O_3、Na_2O、K_2O和CO_2,暗示辉石及其中岩浆包裹体玻璃可能源自同一岩浆,随岩浆的结晶演化CO_2等挥发份更加富集于岩浆中。本研究为理解胜利油田火山岩浆演化过程及CO_2气藏形成的岩浆去气机制提供了信息和证据。This paper reports a study of the composition and significance of magmatic inclusions in pyroxene of volcanic rocks from the Shengli Oilfield. There are significant differences in the composition of pyroxene and its magmatic inclusions between CO2 gas fields and non-CO2 gas fields: for the former, the pyroxene is augite characterized by higher SiO2, lower Al2O3, TiO2 and volatile components, the metallic micro-mineral in the magmatic inclusions is pyrite; but for the latter, the pyroxene is diopside characterized by lower SiO2 and volatile components, higher Al2O3, TiO2 and volatile component, the metallic micro-mineral in the magmatic inclusions is anatase. Also in the former, a high CO2 content is seen in the glass phase of the magmatic inclusions. The results show that the glass of the magmatic inclusions has higher Al2O3, Na2O, K2O and volatile components than the pyroxene, and the brown glass of the magmatic inclusions has higher Al2O3, Na2O, K2O and CO2 contents than the colorless glass, suggesting an enrichment of CO2 with the evolution of the magma. This study has contributed to a better understanding of the evolution of magma and the magma-degassing mechanism of the formation of CO2 gas pools in the Shengli Oilfield.

关 键 词：岩浆包裹体 火山岩 辉石 胜利油田 二氧化碳气藏 

分 类 号：P588.1[天文地球—岩石学]