埕岛东斜坡主力烃源岩判定及油气来源分析

Identification of Main Source Rocks and Oil-Source Correlation in Eastern Slope of Chengdao

以地化实测数据为基础,综合应用钻井、测井等地质资料,从有机质丰度、类型、成熟度以及生物标志物等方面对埕岛东斜坡烃源岩生烃能力及成烃特征进行了研究。结果表明埕岛东斜坡东营组中下部、沙一段都发育好–优质烃源岩,并重新界定了东营组生烃门限。油源对比表明埕岛东斜坡及其周缘东营组油气以自生自储为主,混有少量沙一段的贡献,而沙三段油气主要分布在坡折带以及深洼带靠近断裂的潜山储层中。结合成藏条件分析认为,除坡折带的构造–岩性油藏之外,深洼带生烃门限范围内的岩性油气藏也是进一步勘探的有利地区。

Based on drilling, logging and geochemical data, the comprehensive research of the hydrocarbon generation capacity and characteristics of the source rocks in eastern slope of Chengdao were conducted from the geochemical characteristics such as total organic content, type, maturity and biomarkers. The results show that excellent source rocks were found in the lower-middle part of the Dongying formaiton and Es1 of research area. Oil-source correlation indicated that the oil found in Dongying reservoirs is mainly originated from Dongying formations and mixed with a small amount of Es1, while the oil from Es3 were mainly distributed in the slope break belt and buried hill reservoirs in the deep depression. Combined with the analysis of reservoir forming conditions, it was concluded that in addition to the tectonic-lithologic reservoir in the slope break belt, the lithologic reservoir in the deep depression will also be favorable areas for further exploration.