CAJ | 학술논문

中上扬子区海相层系烃源岩相对该区陆相烃源岩总体富硫，且不同层位、同层位不同岩性烃源岩硫含量差异明显，总硫含量与总有机碳含量间存在一定的正相关性。烃源岩中各种形态硫以有机硫和无机黄铁矿硫为主，单质硫在海相烃源岩中较常见，但占总硫含量的比例低。海相烃源岩硫同位素变化范围大，主要在-35‰~30‰，有机硫和单质硫同位素相对偏负，均值分别为-8.68‰和-5.65‰；黄铁矿和硫酸盐硫同位素则相对偏重，均值分别为4.15‰和2.19‰。
중상양자구해상층계경원암상대해구륙상경원암총체부류，차불동층위、동층위불동암성경원암류함량차이명현，총류함량여총유궤탄함량간존재일정적정상관성。경원암중각충형태류이유궤류화무궤황철광류위주，단질류재해상경원암중교상견，단점총류함량적비례저。해상경원암류동위소변화범위대，주요재-35‰~30‰，유궤류화단질류동위소상대편부，균치분별위-8.68‰화-5.65‰；황철광화류산염류동위소칙상대편중，균치분별위4.15‰화2.19‰。
Marine hydrocarbon source rocks in the Middle-Upper Yangtze region are rich in sulfur compared with terrestrial source rocks. Significant differences exist in sulfur content of source rocks in different formations or in the same formation with different lithology. There are obvious positive correlations between sulfur content and TOC of source rock. Sulfur in marine source rock exists mainly in form of organic sulfur and pyritic sulfur. Ele-mental sulfur is common in soluble extracts of marine source rock, but it has a variable content and occupies a lower percentage of total sulfur content. The δ34 S value of sulfur in marine source rock has a broad variation range from -35‰ to 30‰. The average values of δ34 S of organic sulfur and elemental sulfur are negative with-8. 68‰ and -5. 65‰ respectively, and those of pyritic sulfur and sulfate sulfur are positive with 4. 15‰ and 2. 19‰ respectively.