ORIGIN, MIGRATION AND ACCUMULATION OF CO2 IN SANSHUI BASIN AT NORTHERN SOUTH CHINA SEA CONTINENTAL MARGIN AND MAIN CONTROLLING FACTORS
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摘要: 三水盆地二氧化碳依据其地质地球化学特征判识,主要属火山幔源型成因类型,亦有灰岩热蚀变壳源型及少量壳幔混合型成因类型。二氧化碳气源供给主要来自火山幔源活动之原始岩浆脱排气作用,但灰岩受火成岩热蚀变所产出的二氧化碳为其重要补充。火山幔源型二氧化碳气藏形成及分布,主要取决于火山幔源脱排气活动、深大断裂导气输送作用及有效圈闭三者相互间的时空配置,并受控于气源供给系统(气源构成与输导格架)和运聚成藏之圈闭聚集系统(储盖组合及有效圈闭)这两大主控因素之制约。基于该区火山幔源型和灰岩热蚀变壳源型二氧化碳成因及气源构成特点与运聚富集规律,即可评价预测这些不同成因二氧化碳的有利富集区带及资源潜力,进而为油气勘探部署决策及综合利用等提供指导和借鉴。Abstract: Geological and geochemical characteristics suggest that the CO2 of the Sanshui Basin is mainly of a volcanic mantle type. The rest is from the thermal alteration of limestone crust, with a small amount formed by the mixing of gases from both of the mantle and crust. The CO2 was mainly supplied by the degassing of magma in the volcanic mantle. However, the CO2 released from limestone under the affect of thermal alteration by igneous intrusion could be an important supplement to it. The formation and distribution of the carbon dioxide of volcanic mantle-type mainly depended on the space-time configuration of the degassing of the volcanic mantle, the deep fault pattern, which provided the path for gas migration, and the availability of effective traps. There are two main controlling factors, namely the source and gas supply system (gas source contents and transport framework), and the accumulation and trap system (reservoir-seal combination and effective trap). According to the origin, the characteristics of gas source composition and the migration and accumulation pattern of the carbon dioxide of volcanic mantle type and limestone thermal alteration type in this area, we could make an evaluation of resource potential and prediction of favorable exploration targets to provide a reference for decision making in exploration and deployment of the resources.
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