莺—琼盆地多源非生物CO_2运聚成藏特征  

MIGRATION AND ACCUMULATION OF ABIOGENIC CO_2 FROM MULTIPLE SOURCES IN THE YINGGEHAI-QIONGDONGNAN BASIN

作　　者：何家雄[1] 夏斌[1] 阎贫[1] 龚发雄[1] 

机构地区：[1]中国科学院边缘海地质重点实验室

出　　处：《天然气工业》2007年第4期10-14,共5页Natural Gas Industry

基　　金：中科院知识创新项目(KZCX2-YW-203);国家"863"计划"海洋非烃气资源的判别技术"(2002AA615040)项目成果

摘　　要：南海北部莺—琼盆地壳源型、壳幔混合型及火山幔源型三类非生物(无机)成因二氧化碳资源丰富,据目前的勘探及研究成果,其二氧化碳资源量逾1×1012m3,勘探所获地质储量近3000×108m3,居中国之首。该区非生物二氧化碳资源一方面既能广泛应用于国民经济及工农业生产中,另一方面也可能成为导致“厄尔尼诺”现象、严重影响生态环境的主要温室气体。为此,对其运聚与成藏特征进行了研究。结果认为:①该区多源非生物二氧化碳可划分为壳源型、壳幔混合型及火山慢源型等3大成因类型;②壳源型、壳幔混合型非生物二氧化碳主要富集于莺歌海盆地泥底辟浅层,具平面上分区分块剖面上分层分带的运聚成藏特征,而火山幔源型二氧化碳主要展布于琼东南盆地东部Ⅱ断裂带周缘区,且受控于深大断裂及火山幔源活动的相互配置;③南海北部莺—琼盆地二氧化碳资源潜力大,尤其是莺歌海盆地壳源型非生物二氧化碳资源量及地质储量规模大,在国内外亦是罕见的,颇具资源潜力与综合开发利用前景。The Yinggehai-Qiongdongnan Basin,located in the northern part of South China Sea,is rich in abiogenic(inorganic)CO2 sourced from crust,crust-mantle and volcanic-mantle.Current exploration and study results show that the amount of CO2 resources is over 1 TCM and the geologic reserves are about 300 BCM,the largest in China.On the one hand,these abiogenic CO2 resources in this study area can be extensively utilized in the national economy and the industrial and agricultural production.On the other hand,they can also become greenhouse gases causing 'EI Nino' and seriously impactimg ecological environment.Therefore,their patterns of migration and accumulation should be studied as soon as possible.The following 3 conclusions are drawn from our study.① Three genetic types of abiogenetic CO2 are recognized in the study area,including crust-derived,crust-mantle-derived and volcano-mantle derived CO2.② The former two types of abiogenetic CO2 are mainly distributed in the shallow mud diapers in the Yinggehai Basin and their migration and accumulation are characterized by lateral segmentation and vertical zonation,while the third one is mainly distributed in the periphery of fault zone Ⅱ in the eastern part of the Qiongdongnan Basin and is controlled by the timing of deep major fault and volcano-mantle activities.③The CO2 resource potentials are large in the Yinggehai-Qiongdongnan Basin,the northern part of South China Sea,especially in the Yinggehai Basin where the resources and geologic reserves of crust-derived abiogenic CO2 are among the largest both at home and abroad,thus the prospect of comprehensive development and utilization is bright.

关 键 词：莺-琼盆地 非生物成因 二氧化碳 运移 聚集 成藏 特点 资源评价 资源量 利用 

分 类 号：P618.13[天文地球—矿床学]