Characteristics of Organic Geochemistry of Lucaogou Formation Source Rocks, Upper Permian, Santanghu Basin
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摘要: 三塘湖盆地上二叠统芦草沟组分布面积广、厚度大、有机碳含量高，具好的生烃潜力，是盆地内主力烃源岩。烃源岩样品可溶有机质中含有丰富的脂肪酸、脂肪酸酯等含羰基化合物，随着埋深增加，饱和烃和芳烃含量递增，非烃含量和有机碳则呈递减趋势，表明含羰基化合物对源岩生烃有较大的贡献。饱和烃的各项指标显示，烃源岩的沉积环境为咸化湖相还原环境，母质输入以水生生物为主，陆源物质输入较少。诸多证据表明，在沉积初期和成岩早期细菌输入较多，细菌输入有机质构成了原始有机质的一部分，细菌改造原始有机质并产生前述含羰基化合物，在热作用和微生物作用下均可成烃。Abstract: Upper Permian Lucaogou Formation of Santanghu Basin with a wide distribution, large thickness, high organic carbon content, and good hydrocarbon potential, was the main source rocks in the basin. Soluble organic matter from rock samples contains rich carbonyl compounds such as fatty acids, fatty acid esters, etc. Saturated hydrocarbons and aromatics content increasing along with the depth increase, but nonhydrocarbon content and organic carbon decreasing, showed these carbonyl compounds in the source rocks have made a greater contribution to hydrocarbon generation. The indicators of saturated hydrocarbon showed that the depositional environment of source rocks was the salinity lake, reduction conditions. The input of the parent material dominated by aquatic organisms, terrestrial input less. A lot of evidence indicated that bacteria entered the organic matter deposition during the early diagenesis stages and formed part of the original organic matter; bacteria transformed the original organic matter and produced the aforementioned carbonyl compounds, hydrocarbons could be generated in the thermal effect and affection of microorganisms.
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Key words:
- Lucaogou Formation /
- source rock /
- geochemical characteristics /
- carbonyl compounds /
- hydrocarbon generation /
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