鲁西南晚古生代泥页岩地球化学特征与沉积环境分析

Geochemical Characteristics of Mud Shale and Sedimentary Microfacies Research of Late Paleozoic in Southwestern Shandong Province

摘要:

鲁西南地区是重要的煤炭生产基地，但油气资源调查工作及相关沉积环境分析开展较少。鲁页参1井的实施证实山西组下部和太原组上部及中下部发育的暗色泥页岩具有生油岩特征。通过XRF高精度元素扫描方式对鲁页参1井晚古生代泥页岩层段进行连续扫描，获得以主、微量元素含量为主的配套数据300个，结合岩石学、沉积地球化学方法对鲁西隆起晚古生代地层特征及沉积环境演化进行研究。结果表明：以鲁页参1井为代表的晚古生代泥页岩有机碳含量较高，大部分烃源岩达到中等级别以上，干酪根以利于生气的Ⅲ型为主；热演化程度处于成熟演化阶段，具有较好的生烃潜力；晚古生代沉积环境整体呈现由海相向陆相转变的趋势，属海陆过渡相沉积，地化指标和粘土矿物特征对沉积环境及其变化趋势指示明显。

Abstract:

As to study the sedimentary characteristics and environments of southwestern Shandong province could provide a basis for the assessment of source rocks, geochemical elements of LYC1 well sediment core is tested by highresolution XRF scanning method. 300 set of data of geochemical elements have been gained. By using petrology and sedimentary geochemical mehods, characteristics and sedimentary environment evolution of Luxi uplift in late Paleozoic period have been studied. It is showed that organic carbon contents of late Paleozoic shale which LYC1 well is the representative is high. Most of the hydrocarbon source rocks reached medium level and above, and kerogen is mainly Ⅲ type which is favorable for producing gases. Thermal evolution degree is in mature stage and has good potentiality of hydrocarbon generation. Late Paleozoic sedimentary environment presents an overall trend from marine facies to continental facies. It belongs to continental transitional facies. Geochemical index and characteristics of clay minerals have an apparent of sedimentary environment change trend