Dawsonite Characteristics and Its Implications on the CO2 in Yinggehai-Huangliu Formation of Ledong Area, Yinggehai Basin
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摘要: 作为天然CO2的示踪矿物，片钠铝石的形成与CO2充注密切相关.莺歌海盆地乐东区乐东X构造莺歌海组-黄流组CO2气藏内发育含片钠铝石砂岩，在开展的岩石学和地球化学研究基础上，确定了研究区片钠铝石的产状和纵向分布特征，分析了形成片钠铝石的“碳来源”和气水条件，进而探讨了与片钠铝石具有成因联系的CO2的成因.乐东X构造含片钠铝石砂岩为细—极细粒长石石英砂岩和岩屑石英砂岩，片钠铝石主要以充填孔隙及交代颗粒的形式产出，是成岩共生序列中形成较晚的自生矿物之一.在纵向上，片钠铝石仅集中发育于高含CO2气层的底部以及其下的水层中，这一分布特征以地质实例的形式证实了片钠铝石的形成需要水的参与.研究区浅层CO2充注后形成的碳酸盐矿物为片钠铝石和铁白云石.片钠铝石的碳氧同位素特征表明形成片钠铝石的“碳”与LDX构造气层中CO2具有相同的碳来源，以无机幔源成因CO2为主.红河断裂以及莺歌海盆地中央坳陷内一系列底辟构造及伴生的垂向裂隙可能为CO2的运移通道.Abstract: It has been proved that there is a great relationship between the genesis of dawsonite and the injection of CO2, while dawsonite, the trace mineral of CO2, is developed in the Yinggehai-Huangliu Formation, Ledong Area, Yinggehai Basin. Petrologic and isotopic geochemical characteristics were investigated by polarizing microscope, scanning electron microscope (SEM) and carbon-oxygen isotopic analysis. The diagenesis sequence indicates that dawsonite and ankerite formed after CO2 flooding, meanwhile, the carbon-oxygen isotopic analyses show that the mantle-magmatic CO2 provided the carbon sources for the deposite of dawsonite. Thereby, it can be deduced that, CO2 in gas reservoir and CO2 which for dawsonite genesis had the same carbon source, both of which had got the contribution from the mantle-magmatic CO2. The migration pathway for the mantle CO2 might be the Red River fault zone and the central diaper structures in Ledong Area, Yinggehai Basin. The longitudinal distribution characteristics of dawsonite, which mainly developed in the interface between gas (with high CO2 content) and water layer, provide the geological evidence showing that water is essential for the interaction between CO2 and the minerals.
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Key words:
- dawsonite /
- carbon /
- CO2 gas reservoir /
- Ledong area /
- Yinggehai Basin
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图 1 莺歌海盆地乐东区含片钠铝石砂岩发育位置
Fig. 1. Location of dawsonite-bearing sandstones of Ledong, Yinggehai Basin.
图 2 乐东X构造莺歌海-黄流组含片钠铝石砂岩岩石类型
Fig. 2. Sandstone composition diagram for dawsonite-bearing samples
图 3 自生矿物典型镜下照片
a.菱铁矿（Sid）呈自形晶分布于碎屑颗粒边缘和次生加大石英（Q2）内侧，1 860.72 m，莺歌海组，偏光显微镜，正交偏光；b.放射状片钠铝石（Daw）交代石英次生加大（Q2），1 841.62 m，莺歌海组，偏光显微镜，正交偏光；c.菊花状片钠铝石集合体（Daw）充填孔隙，1 896.07 m，莺歌海组，偏光显微镜，正交偏光；d.片钠铝石（Daw）交代白云石（Dol），1 860.72 m，莺歌海组，偏光显微镜，正交偏光；e.片钠铝石（Daw）交代白云石（Dol），1 894.84 m，莺歌海组，扫描电镜；f.生长在放射状片钠铝石（Daw）表面的高岭石（Kao），1 894.84 m，莺歌海组，扫描电镜；g.铁白云石（Ank）或呈自形晶充填孔隙，或呈白云石（Dol）镶边，1 894.84 m，莺歌海组，扫描电镜背散射；h.生长在片钠铝石（Daw）内部的铁白云石（Ank），1 894.84 m，莺歌海组，扫描电镜背散射.
Fig. 3. Micrographs of diagenetic minerals.
图 4 莺歌海盆地乐东X构造储层莺歌海组—黄流组地层成岩共生序列
Fig. 4. Paragenetic sequence for dawsonite-bearing sandstones in Ledong area, Yinggehai Basin
图 5 LDX-1井莺歌海—黄流组片钠铝石和铁白云石纵向分布
Fig. 5. Plot of volume values versus depth for dawsonite (green triangles) and ankerite (red squares) in LDX-1#
图 6 莺歌海盆地莺歌海—黄流组片钠铝石碳氧同位素特征
①.本次研究；②. Baker et al.（1995）；Uysal et al.（2011）；③. Golab et al.（2006）；④. Ferrini et al.（2003）；⑤. Zhao et al.（2018）；⑥. Liu et al.（2011）；⑦. Ming et al.（2017）；⑧. Gao et al.（2009）；⑩. Zalba et al.（2011）
Fig. 6. Plot of δ13C versus δ18O values for dawsonite
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