百色地区下三叠统-泥盆系烃源岩有机地球化学特征及生烃潜力分析

百色盆地海相烃源岩主要为孤立台地和台间海槽碳酸盐岩.根据百色盆地周缘大量露头样品的残余有机碳含量、干酪根碳同位素、饱和烃色谱及色质等地球化学实验数据,分析了下三叠统-泥盆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、低丰度的地化特征,在有机质丰度的热解损失和地表风化损失校正基础上,采用蒙特卡罗法模拟计算烃源岩生烃强度.在综合分析烃源岩地化特征和生烃强度的基础上,认为百色盆地下三叠统-泥盆系海相烃源岩具有低-中等级别的生烃能力.

Geochemical characteristics and assessment of hydrocarbon-generation potential of the Lower Triassic source rock in Baise basin, China

The marine hydrocarbon source rock is generally carbonate rock of isolated platforms and interplatform troughs in the Baise basin.According to the chemical experimental data of residual organic carbon content,kerogen carbon isotope,aliphaltic gas chromatography/mass spectrometry of 67 outcrop specimens in the Baise basin,the authors analyse the geochemical characteristics of the type and the maturation of organic matter in the Lower Triassic-Devonian source rock.Because the surface source rock are high thermal evolution and low residual organic matter abundance,based on correcting the organic matter abundance pyrolysis loss and surface weathering loss,the authors estimate the hydrocarbon-generation intensity of source rock using the Monte Carlo technique.After analyzing the geochemical characteristics and the hydrocarbon-generation intensity of the source rock,the authors consider that the Lower Triassic-Devonian marine source rock has low-middle hydrocarbon-generation potential in the Baise basin.