断裂及岩浆活动对幔源CO_2气成藏的作用——以济阳坳陷为例  

Fault and Magmatic Activity as Control of Mantle Source CO_2 Gas Accumulation: A Case Study of Jiyang Depression

作　　者：林松辉[1] 

机构地区：[1]中国科学院广州地球化学研究所

出　　处：《地球科学（中国地质大学学报）》2005年第4期473-479,共7页Earth Science-Journal of China University of Geosciences

基　　金：中国石油化工股份有限公司科研项目(No.P02066)"胜利山东探区CO2气资源勘探综合研究";国家自然科学基金项目(No.40372067).

摘　　要：尽管CO2气在地壳浅层运聚成藏与常规的烃气相似,都要求有丰富的源、储层、圈闭、输导系统和盖层,但在成因或来源上与烃气有天壤之别.通过对与CO2气田(藏)有关的深大断裂、火成岩进行综合研究认为,岩浆是CO2运移的载体,火成岩的发育则是断裂时空同步活动的重要标志,幔源CO2气的成藏要素最为重要的是“运”,即要有直接或间接与地幔相连的深大断裂,而且,作为一条断裂通道的活动要时空同步.故而CO2气田(藏)的形成,同断裂活动和岩浆活动有着密切的关系.断裂对CO2气田(藏)形成的控制作用表现为:(1)深大断裂控制CO2成藏带;(2)边界断裂及其派生的不同方向、不同级别的断裂控制了盆地内CO2气田(藏)的形成与分布.In the shallow level of the earth's crust, migration and accumulation of CO2 are similar to those of conventional hydrocarbon, and both demand rich sources, reservoirs, traps, migration system and caprocks. However, CO2 is greatly different from hydrocarbon in origin and source. By research for deep faults and igneous rocks related to CO2 gas fields, the author considers that magma is the carrier for CO2 gas migration, while the development of igneous rocks is an important sign of the synchronous fault spatio-temporal activity. The migration is one of the most important elements for mantle source CO2 gas accumulation, which means that there are deep faults connected to the mantle, directly or indirectly, and fault activity must be consistent with CO2 gas migration in space and time. Thus formation of CO2 gas fields is closely related to fault and magma tic activity. Control of the fault in the formation of CO2 gas fields is as follows: (1) deep faults control CO2 gas accumulation belts; (2) the boundary faults and their derivative faults at different directions and different scales control the formation and distribution of CO2 gas fields in the basin.

关 键 词：幔源CO2气 岩浆活动 断裂活动 深大断裂 济阳坳陷 

分 类 号：P618.13[天文地球—矿床学]