东营凹陷沙三段烃源岩生烃模式研究

为了进一步明确分散有机质(一般烃源岩)与有机质富集层(优质烃源岩)生烃过程的差异,采用东营凹陷沙三段中、下亚段烃源岩岩心进行生排烃模拟实验。结合地质剖面分析,认为沙三段中、下亚段烃源岩的生烃特征有明显的不同。沙三段中亚段主要生烃阶段为Ro大于0.5%;沙三段下亚段在Ro为0.4%-0.5%时可生成少量低熟油,当Ro大于0.5%时进入成熟阶段,具有较高的油气产率。沙三段下亚段烃源岩比中亚段明显具有更高的生烃潜力,且生烃区间较大。这取决于其特定的沉积环境所形成的烃源岩在有机质类型、富集程度等方面的差异。

Research on hydrocarbon - generating mode of Es3 source rocks in Dongying Sag

In order to study the different hydrocarbon generating process of dispersed organic matters ( common source rocks) and organic - rich sediments ( high - quality source rocks) , hydrocarbon generation and expulsion experiments were made by source rock cores of lower and middle Es3 from Dongying Sag directly. Combined with geologic profile analysis,it is considered that hydrocarbon - generating characteristics of the two source rocks were different to a great extent. Middle Es3 source rocks greatly generated hydrocarbon when Ro>0. 5%. Lower Es3 source rocks generated a small amount of low - mature oil when Ro was 0. 4% to 0. 5% ; it entered mature period and had higher hydrocarbon production rate when Ro > 0. 5%. Lower Es3 source rocks were higher in hydrocarbon generation potential than middle Es3 and had a longer hydrocarbon generation period. This depends on the source rocks difference on type and abundance degree of the organic matters formed under special sedimentary environment.