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右江盆地含油气成矿流体性质及其成藏-成矿作用
引用本文:顾雪祥,李葆华,徐仕海,付绍洪,董树义.右江盆地含油气成矿流体性质及其成藏-成矿作用[J].地学前缘,2007,14(5).
作者姓名:顾雪祥  李葆华  徐仕海  付绍洪  董树义
作者单位:1. 中国地质大学(北京)地球科学与资源学院,北京,100083
2. 成都理工大学,地球科学学院,四川,成都,610059
3. 中国科学院,地球化学研究所,矿床地球化学国家重点实验室,贵州,贵阳,550002
4. 中国地质大学(北京)地球科学与资源学院,北京,100083;成都理工大学,地球科学学院,四川,成都,610059
基金项目:国家自然科学基金 , 中国地质大学校科研和教改项目 , 高等学校学科创新引智计划
摘    要:右江盆地含油气成矿流体是一种多组分、多相态的不混溶体系,成藏流体具低温(多为90~160℃)和低盐度(多小于6wt%NaCl)的特征,其主要组分是有机质、CO2和H2O;金矿成矿流体以中低温(多集中于150~250℃)和低盐度(0.4~6.7wt%NaCl)为特征,其主要组分为H2O和CO2,次为烃类有机组分。盆地内古油藏与金矿床在空间上密切共存,在成藏和成矿流体活动时限上基本一致,在成因上一脉相承,表明两者均为盆地有机成矿流体演化的产物。加里东晚期至印支中期,"盆-台相间"的沉积构造格局为成矿和成藏奠定了物质基础,盆地有机成矿流体的活动使油气和金属分别聚集形成油气藏和金属矿床。印支晚期至燕山早期,伴随褶皱造山作用的盆地流体活动使油气的原始分布格局发生改变,并造成了油气和金属矿床的空间分带。燕山中晚期强烈的构造抬升剥蚀,使油气藏和金属矿床遭受强烈的破坏与改造。

关 键 词:流体物理化学性质  含油气成矿流体  盆地流体  成藏-成矿作用  右江盆地

Characteristics of hydrocarbon-bearing ore-forming fluids in the Youjiang Basin, South China: implications for hydrocarbon accumulation and ore mineralization
Gu Xuexiang,Li Baohua,Xu Shihai,Fu Shaohong,Dong Shuyi.Characteristics of hydrocarbon-bearing ore-forming fluids in the Youjiang Basin, South China: implications for hydrocarbon accumulation and ore mineralization[J].Earth Science Frontiers,2007,14(5).
Authors:Gu Xuexiang  Li Baohua  Xu Shihai  Fu Shaohong  Dong Shuyi
Abstract:Hydrocarbon-bearing ore-forming fluids in the Youjiang Basin,South China are a multi-components and multi-phases immiscible system.The reservoir-forming fluid is characterized by low temperature(typically between 90-160℃)and low salinity(mostly below 6 wt % NaCl equivalent)with main components of hydrocarbon,CO2,and H2O.The ore-forming fluids of gold deposits having medium to low temperatures(typically between 150-250℃)and a low salinity(0.4-6.7 wt % NaCl equivalent)are mainly composed of H2O and CO2 with only subordinate hydrocarbons.The close spatial association of the paleo-hydrocarbon reservoirs with gold deposits,the contemporaneous activity of reservoir fluids and ore-forming fluids,and the intimate relationship between the genesis of reservoir and of the gold mineralization,suggest that both the hydrocarbon reservoirs and the gold deposits are products of organic basinal fluids.During the Late Caledonian to the middle Indosinian,the alternation of the sedimentary-tectonic framework between basin and platform laid a base for the formation of hydrocarbon reservoirs and mineral deposits.The activation of organic ore-bearing basinal fluids was responsible for both metal and oil-gas accumulation.The basinal fluid flow accompanied by orogeny during the late Indosinian to early Yanshanian changed the distribution pattern of hydrocarbons and resulted in spatial zonation of mineral deposits and oil-gas reservoirs.Extensive tectonic uplift and denudation during the middle and late Yanshanian have greatly reworked and partly destroyed the deposits and reservoirs.
Keywords:physicochemical characteristics of fluid  hydrocarbon-bearing ore-forming fluids  basin fluids  hydrocarbon accumulation and gold mineralization  Youjiang Basin
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