黑龙江依兰煤田达连河组油页岩生物标志化合物特征及地质意义

Characteristics and geological significance of oil shale biological marker compound in Dalianhe Formation of the Yilan coal basin in Heilongjiang Province

摘要: 采用气相色谱、气相色谱-质谱技术开展了依兰煤田达连河组油页岩的生物标志化合物特征研究。饱和烃气相色谱显示，达连河组油页岩有机质具有混合来源。中部厚层油页岩样品奇偶优势（OEP）值普遍大于2.4，表明其成熟度相对较低，而煤层间厚层油页岩的OEP均小于2.4，表明随深度的增加其成熟度相对较高。中部厚层油页岩段样品的Pr/Ph值均大于0.8，含煤段油页岩样品的Pr/Ph值均大于2.8。综合分析认为，达连河组下部含煤段油页岩层有机质丰度高，水生低等生物对有机质贡献较大，有机质类型主要为Ⅱ1型，具有姥鲛烷优势，为弱氧化—弱还原、淡水湖沼相沉积；中部厚层油页岩段有机质类型主要为Ⅱ1型、Ⅱ2型，具有姥植均势，反映了淡水—微咸水深湖相环境。

Abstract: Organic matter is abundant in oil shale of coal seam in Dalianhe Formation. Low maturity form of aquatic organism contributes significantly to organic matter. Organic matter is mainly of type Ⅰand Ⅱ1, indicating pristine dominance and deposition in a fresh water, lake-swamp, lower oxygen and anoxic environment. The organic matters of oil shale member are mainly composed of type Ⅱ1 and Ⅱ2, reflecting pristine dominance and deposition in a fresh water and salty water environment.