摘要
共和盆地下白垩系烃源岩分布在贵德坳陷,预测烃源岩面积1 500km2,平均厚度200m。在万秀剖面中,烃源岩主要分布在万二段和万三段下部,厚232m,烃源岩类型主要为滨浅湖相-深湖相黑色泥页岩和灰色泥岩,其有机质丰度达中-好生油岩标准,有机质类型主要为Ⅰ-Ⅱ型,实测镜质体反射率均大于0.7%,94.3%的样品热解峰温大于435℃,达到了有机质热演化的成熟至高成熟阶段,并且万二段优于万三段。研究表明,共和盆地白垩系烃源岩为一套好烃源岩,具有很高的生烃潜力。
The lower cretaceous source rocks are distributed in Guide depression,Gonghe Basin,whose prediction area is 1500km2,and average thickness is 200m.The source rocks of Wanxiu outcrop in Gonghe Basin are mainly in Wan2and lower Wan3with thickness of 232m.The lithologic types of source rocks are black shale and grey mudstone in sediments,the source rocks indicated by organic matter abundance are the medium-good oil source rocks,and the organic matter types are mainly the type ofⅠ-Ⅱ.Vitrinite reflectance（Ro）values for all source rocks are above 0.7%,and the peak temperature of pyrolysis revealed by 94.3%samples is above 435℃,indicating that the source rocks are mature to high mature stage and that the source rocks in Wan2are better than those in Wan3.The results indicate that the lower cretaceous source rocks in Gonghe Basin are oil source rocks of high quality and have great potential for hydrocarbon generation.
出处
《湖北工程学院学报》
2014年第3期106-110,共5页
Journal of Hubei Engineering University
关键词
烃源岩
下白垩系
露头
共和盆地
source rock
lower cretaceous
outcrop
Gonghe basin
