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南海北部边缘盆地CO2资源丰富,CO2成因类型主要属壳源型、壳幔混合型和火山幔源型,这些不同成因CO2的形成主要取决于具体的地质条件及控制因素。由于盆地所处地质背景、地质属性和结构类型的差异,导致不同地区的油气、CO2运聚规律与形成的地质条件及主控因素均明显不同。壳源型和壳幔混合型CO2富集于西北边缘莺歌海走滑伸展型盆地,受控于海相含钙砂泥岩与泥底辟热流体上侵活动的物理化学综合作用;火山幔源型CO2则主要展布于东北边缘琼东南及珠江口断陷裂谷盆地,其火山幔源岩浆脱排气活动与深大断裂导气输送作用的配置,控制了这种类型CO2的运聚乃至富集成藏过程。
The northern marginal basin of the South China Sea is rich in CO2 resources. The main types of CO2 genesis are the crust type, crust-mantle type and volcanic mantle type. The formation of these different causes of CO2 mainly depends on the specific geological conditions and controlling factors. Due to the difference of geological background, geological attribute and structure type in the basin, the migration and accumulation of oil and gas and CO2 in different areas are obviously different from the geological conditions and main controlling factors. Carboniferous and crust-mantle mixed CO2 is enriched in the Yinggehai strike-slip extensional basin on the northwestern margin and is controlled by the physical-chemical interaction of marine calc-sands and mudstones. The volcanic mantle-derived CO2 is mainly distributed in the Qindongnan and Pearl River estuary rift basins on the northeastern margin of the basin. The arrangement of the volcanic mantle-derived magma degassing activity and the deep-seated fault gas-conducting transport mechanism controls the accumulation and enrichment of this type of CO2 Integrated reservoir process.