三塘湖盆地石炭系火山岩构造背景与油气成藏  

Tectonic background and hydrocarbon accumulation of carboniferous volcanic in Santanghu basin

作　　者：闫玉魁[1,2] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]中国石油吐哈油田公司勘探处,新疆哈密839009

出　　处：《中国矿业》2009年第6期46-49,52,共5页China Mining Magazine

摘　　要：火山岩的岩浆起源和岩浆演化受控于所处的地球动力学背景,不同构造环境下形成的火山岩地球化学特征不同。本文通过对三塘湖盆地石炭系火山岩化学成分、微量元素丰度和稀土元素配分形式等研究,结合构造演化分析,认为石炭系火山岩总体形成于大陆边缘构造环境,但不同时期构造背景略有不同,其中哈尔加吾组火山岩以板内环境为主,卡拉岗组火山岩以火山岛弧环境为主。此背景条件下形成的中基性火山岩富含斜长石和沸石杏仁体,易于风化淋滤形成优质储层,在源控范围内形成下生上储式风化壳型油气藏和自生自储式火山岩内幕型油气藏。The magmatic origin and evolvement of volcanic rock are controlled by its geodynamic back- ground. Volcanic rock in different tectonic environment forms different geochemical characteristics. The study such as chemical constituents, trace element abundances and REE pattern of Carboniferous volcanics in Santanghu basin and analysis of tectonic evolvement show that the Carboniferous volcanics was formed in continental margin setting generally. Tectonic background has slightly difference in different stages, among them, volcanic rock of C2 h is mainly on within-plate setting, and C2 k is mainly on volcanic island arc setting. Mafic-intermediate volcanic rocks that formed in the setting are abundant in plagioclase and zeolite amygdale, which are apt to be weathering and leaching and form the high-quality reservoir, and weathered crust reservoir with lower generation and upper accumulation and inner formation volcanic reservoir with self generation and self accumulation formed in oil-source control range.

关 键 词：构造背景 火山岩 岩石系列 火山岛弧 大陆板块 

分 类 号：P168.130.2[天文地球—天文学]