二连盆地石炭系—二叠系烃源岩有机地球化学特征及生烃潜力

二连盆地海相烃源岩主要为海槽沉积的石炭系—二叠系泥岩和碳酸盐岩。根据盆地周缘69个露头剖面样品的残余有机碳含量等地球化学实验数据,分析了石炭系—二叠系海相烃源岩的有机质丰度、类型、热演化程度。针对地表烃源岩样品具有高热演化、低丰度的地球化学特征,在有机质丰度的热解损失和地表风化损失校正基础上,采用TSM盆地模拟技术计算烃源岩生烃强度。综合分析认为,二连盆地石炭系—二叠系海相烃源岩具有低—中等级别的生烃能力。

Organic Geochemistry Characteristics and Hydrocarbon Generation Potential of Carboniferous-Permian Marine Source Rocks in Erlian Basin

The marine hydrocarbon source rocks in Erlian Basin are mainly composed of argillaceous rocks and carbonate rocks deposited in a trough environment. According to the data of experimental geochemistry such as residual TOC,carbon isotope of kerogen (δ13C) and GC-MS analysis of hydrocarbon in outcrop samples from basin margin,the abundance,types and thermal evolution extent of organic matter from Carboniferous-Permian marine source rocks are presented. The TSM basin modeling technology was applied to calculate hydrocarbon-generating intensity on the basis of thermolysis loss of organic matter abundance and correction of surface weathering loss,and combined with the geochemistry characteristics of hydrocarbon samples with high thermal evolution and low abundance. By the integrated analysis of geochemistry characteristics and hydrocarbon-generating intensity,it is included that Carboniferous-Permian source rocks in Erlian Basin have low-to medium-graded hydrocarbon-generating potential.