摘要
胶莱盆地东北部白垩系莱阳组下部的逍仙庄段和中部的水南段发育有两套暗色泥岩和碳酸盐岩沉积。其有机地球化学环境参数分析表明 ,这两套沉积其形成于缺氧还原的微咸水咸水的半深湖深湖环境 ,是盆地主要的烃源岩系。烃源岩有机碳含量较高 ,尤其是水南段可以达到中等—好烃源岩的标准。但烃源岩中可溶有机质含量变化较大 ,并以低值为主。生烃潜力变化较大 ,可溶有机质转化率和烃转化率都比较低。干酪根显微组分以腐泥组分含量高为特征 ,烃源岩有机质的输入以低等水生生物和原生生物为主 ,混有陆源高等植物。逍仙庄段干酪根以Ⅱ2 —Ⅲ型为主 ,水南段以Ⅰ—Ⅱ1型为主。综合Tmax,Ro,OEP ,CPI和甾萜烷成熟度参数可以看出 ,烃源岩的成熟度已明显进入生油窗 ,逍仙庄段以成熟晚期和高成熟为特征 ,水南段正处于最佳生油期。
Two sets of dark shale and carbonate rocks developed in the Xiaoxianzhuang section and the Shuinan section of the Cretaceous Laiyang Group are the main hydrocarbon source rocks in the Jiaolai Basin.The parameters of organic geochemistry indicated that the two sets of source rocks were deposited in the bathybic and bathyal milieu with the subsaline-saline water. The contents of organic carbon in the Cretaceous source rocks are higher.The extractable organic matter(EOM) contents in the source rocks varied within a wide range, and the most EOM contents of the samples are in the low levels. The generation potentials of hydrocarbon also varied greatly.The conversion rates of the extractable organic matter and the hydrocarbon are both lower.The amorphous solid are mainly macerals of kerogen,and the vitrinite comes second. The amount of exinite and inertinite are very small.The organic matters of source rocks were mainly derived from the lower hydrophilic organism and protobiont mixed with fewer input of higher plant.The kerogen in the Xiaoxianzhuang section is in the Ⅱ_2-Ⅲ type,and that in the Shuinan section is in the Ⅰ-Ⅱ_1 type.Some parameters of steranes and terpenoids show that the maturations of organic matters have entered into 'oil window' and have not reached to the over-matured stage.
出处
《石油大学学报（自然科学版）》
CSCD
北大核心
2003年第5期16-20,共5页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
胶莱盆地
白垩系
烃源岩
有机地球化学特征
生烃潜力
有机碳
石油勘探
Jiaolai Basin
Cretaceous
source rocks
organic geochemistry characteristics
hydrocarbon-generation potential
organic carbon
