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在获取大量地质地化资料的基础上，重点对CO₂成因及运聚成藏的主要控制因素进行了深入的剖析与探讨。研究表明，莺歌海盆地壳源型及壳幔混合型CO₂形成及富集成藏，主要受控于泥底辟热流体晚期分层分块多期的局部上侵活动与沉积巨厚的上新统—中新统海相含钙砂泥岩的物理化学综合作用，且其运聚分布规律亦具多期和分层分区的特点；琼东南盆地东部及珠江口盆地火山幔源型成因CO₂则主要受控于幔源型火山活动与沟通深部气源的基底深大断裂的发育展布程度,其运聚富集规律与幔源型火山活动及深大断裂的发育展布密切相关，CO₂气源主要来自地壳深部幔源火山活动所伴生的大量CO₂。因此,根据壳源型岩化成因CO₂与火山幔源型成因CO₂不同成因及成藏条件，可以追踪其气源,分析和预测天然气尤其是CO₂运聚分布规律,为天然气勘探部署及决策提供依据，减少和降低勘探风险。

Main Control Factors of CO2 Reservoir Formation in the Marginal Basins in the North Part of South China Sea

On the basis of a great deal of geological and geochemical data, the main control factors of the CO 2 origin, migration, accumulation and reservoir formation are emphatically analyzed and discussed in the paper. Through investigation, it was indicated that, in Yinggehai Basin, the origin, enrichment and reservoir formation of the crust source and mixed crust-mental source CO 2 were controlled by the comprehensive physicochemical action of the mud diapir hot fluids of late layering-blocking multistage local upward invation on the massive marine calcareous sandstones and mudstones of Pliocene-Miocene and its migration, accumu lation and distribution laws were of multistage layering-zon-ing characteristics; and, in East Qiongdongnan Basin and Zhujiangkou Basin, the volcanic mantle source CO 2 was mainly controlled by the mantle sourc volcanic activity and the development and distribution of basement discordogenic faults and its migration and enrichment laws were closely re lated to them, the CO 2 gas source being the CO 2 associated with the deep mantle-derived volcanic activity. Therefore, according to the CO 2 with different origins and their reser voiring conditions, their gas sources may be found out and the migration, accumulation and distribution laws of natural gas, especially CO 2 , can be analyzed and predicted, thus providing basis for the disposition and policy-making of gas exploration and reducing exploration risk.