临清坳陷东部太原组煤系烃源岩沉积有机相分析

Analysis of organic facies of coal-bearing source rocks in Taiyuan formation of Eastern Linqing Depression

临清坳陷东部太原组煤系是1套良好的生油源岩,其生油潜力主要取决于沉积有机相。根据沉积学和有机地球化学特征,对其有机相类型和纵向分布规律进行了研究:太原组中部湖成沼泽腐泥-腐植煤相和滨浅湖—沼泽腐植泥相为煤成烃的主要源区;太原组顶、底部均以滨海沼泽腐植煤相沉积为主,生烃潜力较小;半深湖—浅湖腐泥相纵向上分布较少,生烃贡献小。烃源岩综合分析为解决石炭—二叠系煤系源岩生油研究提供了重要资料。

The coal measures of Taiyuan formation in the Eastern Linqing Depression are a set of good source rocks. The genetic potential mainly depends on depositional organic facies. Based on sedimentology and organic geochemistry characteristics, the organic facies and vertical distribution are studied for this area. The major source provenances of coal-generated hydrocarbon are lacustrine marsh putrid mud-chameolith facies and shore-shallow lake-marsh putrid mud facies in the middle of Taiyuan formation; the seamarsh chameolith facies dominated the top and bottom of Taiyuan formation and had little genetic potential; the semideep-shallow lake putrid mud facies distributed sparsely vertically and contributed little to hydrocarbon generation. Comprehensive analysis of source rocks has provided important information for the study of hydrocarbon generation from coal-bearing source rocks in Carboniferous-Permian formations.