中国东部幔源流体的活动特征与成藏效应  

ACTIVE CHARACTERISTICS AND ACCUMULATIVE EF-FECTS OF MANTLE-DERIVED FLUIDS IN EA STERN CHINA

作　　者：陶明信[1] 徐永昌[1] 韩文功[1] 高波[1] 马锦龙[1] 王万春[1] 

机构地区：[1]中国科学院兰州地质研究所

出　　处：《大地构造与成矿学》2001年第3期265-270,共6页Geotectonica et Metallogenia

基　　金：国家重点基础研究发展规划项目G1999043309;中国科学院知识创新工程项目资助.

摘　　要：中国东部进入地洼构造演化阶段后发生了一系列构造活化现象,形成了一系列伸展性断层和巨型深大断裂带,其中的一些超壳或岩石圈断裂成为壳幔物质与能量交换,特别是地幔流体上升的主要构造通道。在郯庐断裂带附近及两侧的松辽、辽河、黄骅、济阳、苏北和三水盆地(坳陷)中的许多气井中,He和CO2的含量很高,部分气井中He的浓度超过其工业品位(0.05%)CO2的含量在80%以上,甚至近于纯CO2气藏。这些气井中的He和CO2不仅显示幔源特征,而且CO2具有岩浆成因特征。此类幔源气体一般都和壳源气体组分复合,在储盖层及构造圈闭发育的地区聚集成藏。A series of tectonic mobilizations come to pass after eastern China ente red diwa (geodepression)stage,which lead to form a series of s tretching fractures and giant deep f ault zone.Some of them are cross-crustal/lithospheric fractures,which are major structural passages of crust-mantle mass and en ergy exchange,especially of ascent of mantle fluid.In many gas wells of the Songliao,Liaoh e,Huanghua,Jiyang,Subei and Sansh ui basins near the Tan -Lu fault zone or on both sides there are abundant He and CO 2 gases,He concentrations exceed their industrial grade(0.05%)in partial wells,CO 2 content is more than 80%,or nearly pure CO 2 reservoirs.Those He and CO 2 show not only mantle-derived characteristics but also magmatic origin.This kind of ma ntle-derived gases averagly compou nd with crust-derieved ones,gather and form reservoirs where reservoirs and structural traps a re well developed.

关 键 词：中国东部 构造活化 深大断裂带 幔源流体 成藏效应 壳源气体 构造圈闭 储盖层 

分 类 号：P618.130.2[天文地球—矿床学] TE12[天文地球—地质学]