漠河盆地二十二站组烃源岩评价

Source Rock Evaluation of Ershierzhan Formation in Mohe Basin

摘要: 漠河盆地中侏罗统暗色泥岩发育，但勘探程度相对较低，区内烃源岩缺乏系统的认识及有效的评价。以石油地质学及油气地球化学理论为指导，综合有机质丰度、类型、成熟度等指标，有效评价了漠河盆地二十二站组烃源岩。研究表明：区内暗色泥岩表现为高总有机碳质量分数(w(TOC))特征，平均为1.37%，基本达到了中等–好烃源岩标准；有机质类型主要为II~III型；有机质演化普遍处于成熟阶段–过成熟阶段，且由东至西有机质演化程度逐渐增强。

Abstract: The Middle Jurassic dark mudstone was developed in Mohe Basin, but the degree of exploration was relatively low. It was lack of systematic understanding and effective evaluation on source rocks in the area. Guided by the petroleum geology and petroleum geochemical theory, the index of organic matter abundance, type and maturity was comprehensively used for evaluating the source rocks of Ershierzhan Formation in Mohe Basin. Research shows that the dark mudstone has high w(TOC). It is 1.37% in averages, and it reaches the standard of medium-good hydrocarbon source rocks. The organic matter type is II~III. The evolution of organic matter is generally at the mature-over-mature stage, and the evolution of organic matter enhances gradually from the east to the west.