论文部分内容阅读
苏北盆地具有形成大型CO2 气田的地质条件 ,黄桥CO2 气田是目前我国陆地开发利用最大的CO2气田之一 ,它具有海相层系与陆相层系共同成藏、深层气藏和浅层气藏互相沟通的特点。深层气藏以高纯度CO2为主 ,浅层气藏以含N2 为主 ,并含有高浓度的He。浅层气藏是深层气藏衍生的产物。CO2 气藏圈闭于由海相中、古生界层系组成的大型背斜中 ,海相碳酸盐岩 (包括部分碎屑岩 )裂隙发育、孔渗条件优越 ,是CO2 成藏的重要储集岩。CO2 气藏之上有巨厚陆相中、新生界 ,是气藏良好的区域盖层。不同气藏气体组分有明显变化 ,但所有气藏组分及其同位素特征表明CO2 气藏基本为岩浆—地幔来源。根据这一成因模式 ,黄桥地区有可观的CO2 远景储量可供勘探。
The Subei Basin has the geological conditions for forming a large-scale CO2 gas field. Huangqiao CO2 gas field is currently one of the most developed land-use CO2 gas fields in China. It has the features of co-formation of marine and continental facies, deep gas reservoirs and shallow layers Gas reservoirs communicate with each other. Deep gas reservoirs are mainly high-purity CO2, while shallow gas reservoirs are mainly N2-bearing and contain high-concentration He. Shallow gas reservoirs are derived from deep gas reservoirs. The CO2 gas trap is trapped in a large anticline consisting of marine and Paleozoic strata. Marine carbonate rocks (including some clastic rocks) have developed fractures with excellent pore-permeability conditions and are important for CO2 accumulation Reservoir rocks. Above the CO2 gas reservoir there is a huge continental facies, Cenozoic, is a good gas reservoir cover. The gas components of different gas reservoirs have obvious changes, but all the gas reservoir components and their isotopic characteristics indicate that the CO2 gas reservoir is basically a magmatic-mantle source. Based on this genetic model, there is considerable potential for CO2 in Huangqiao area for exploration.