Paleoenvironmental difference and controlling factor of trace elements in Pinghu Formation of typical wells in Pinghu Slope Belt of the Xihu Sag, East China Sea Basin
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摘要:
结合地质背景，对研究区的烃源岩进行了有机地球化学综合评价，对西湖凹陷平湖组烃源岩的形成环境等方面进行了系统研究，分析探讨不同沉积环境中平湖组烃源岩的发育特征，重点研究平湖组3个层段沉积物中微量元素的含量及其变化特征与沉积发育时的古盐度、古氧化还原条件、古气候的对应关系，再结合有机碳含量与元素的关系，厘清烃源岩的形成环境及主控因素。研究结果表明：①平湖组各层段多含煤，烃源岩有机质丰度高，为Ⅱ2—Ⅲ型有机质，处于成熟—高成熟阶段，有良好的生烃潜力，平湖组中段烃源岩好于上段与下段；②水体特征为淡水-半咸水，存在局部海侵过程，受到震荡式水体变化影响，平湖组沉积时，总体表现为氧化-还原沉积环境，古气候以温暖湿润为主，从早至晚逐渐向温暖湿润变化；③元素比值及有机碳含量分析表明，研究区烃源岩的发育主要受古气候与古生产力控制，温暖湿润的气候有利于平湖组烃源岩的发育，较高的古生产力主导平湖组中段有机质的富集。
Abstract:Based on the geological background, the organic geochemical comprehensive evaluation on the source rocks in the study area was carried out, and the paleoenvironment of source rocks in the Pinghu Formation in the Xihu Sag were analyzed. The content and variation of trace elements in the three layers of the Pinghu Formation, the corresponding relationship between the paleosalinity, paleoredox conditions, and the paleoclimate during sedimentation were studied. Combined with the relationship between organic carbon content and elements, the paleoenvironment and controlling factors of the source rocks were clarified. Results show that ① all the sections of the Pinghu Formation contain coal, and the organic matter in the source rock is abundant in the types of Ⅱ2 -Ⅲ that are in the mature-high mature stage and have good hydrocarbon generation potential. Meanwhile, the source rocks in the middle section of the Pinghu Formation are better than that in the upper and lower sections. ② The water body was fresh to brackish water with local transgression due to oscillation of local water body. The overall paleoenvironment of Pinghu Formation was in oxidation-reduction. The paleoclimate was mainly warm-humid, and then changed gradually to warm-humid. ③ The development of the source rocks was controlled by mainly paleoclimate and paleoproductivity as indicated by element ratio and organic carbon content analyses. The ancient warm and humid conditions favored the development of the source rocks, and the high paleoproductivity enhanced the enrichment of organic matter in the middle section of Pinghu Formation.
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Key words:
- elemental geochemistry /
- paleoenvironmental reconstruction /
- source rocks /
- Xihu Sag /
- East China Sea
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