白音昆地凹陷烃源岩地球化学特征及潜力分析

Potential Analysis and Geochemical Characteristics of Source Rocks in Baiyinkundi Sag

通过有机碳、岩石热解、干酪根显微组分等多种地球化学分析手段,对白音昆地凹陷九佛堂组和沙海组下段两套暗色泥岩进行了系统评价。研究表明,九佛堂组的暗色泥岩地化指标好于沙海组下段,为该区主要生油层;沙海组下段则作为次要生油层。该区资源潜力较大。针对白音昆地凹陷这一勘探新区,应继续按照"下洼找油"的勘探理念,在凹陷南侧靠近中央洼陷带处寻找九佛堂组和沙海组下段暗色泥岩发育区,进而围绕源岩优选有利区带,为该区下步勘探提供了依据。

Based on the study of a lot of geochemistry anaysis method such as organic carbon,rocks pyrolysis and kerogen macerals constituent,etc,the two sets of dark shale have been evaluated systematically in the Jiufotang and the lower Shahai formation of Baiyinkundi sag. The research indicates that,the organic geochemical index of dark shale in the Jiufotang formation is better than that in the lower Shahai formation. Therefore,the Jiufotang formation is the main source rocks formation in this area,and the lower Shahai formation is considered secondary source rocks formation. The resource potentials of the sag is large. According to the exploration concept of 'seeking for oil around deep down depressions',it is important to the new exploration area for Baiyinkundi sag to continue to look for developed area of dark shale in the Jiufoutang and the lower Shahai formation in the south of the sag and carry out favorable area optimization around the source rocks near the central depression. It provides basis for the following exploration of Baiyinkundi sag.