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| 1 | 重庆地区五峰组—龙马溪组页岩笔石光学特征及其在成熟度评价中的应用显示文摘上奥陶统五峰组—下志留统龙马溪组富有机质页岩以富含笔石为特征,是中国上扬子地区最重要的烃源岩层和页岩气储层之一,但在实际工作中却存在成熟度难以确定的困难。通过对重庆地区五峰组—龙马溪组大量块光片中笔石的光学特征观察和反射率测试,结果表明:五峰组—龙马溪组页岩中被认为是类镜质组颗粒或者沥青的有机质可能是笔石表皮体。五峰组—龙马溪组页岩有机质的非颗粒状结构笔石表皮体丰度较大,且其具有不同于沥青的特殊生物结构和光学特征:生物结构复杂、分节、具有纺锤层、易被黄铁矿充填,尤其是在高过成熟阶段表现出强烈的各向异性。五峰组—龙马溪组样品中非颗粒状结构笔石表皮体的平均双反射率值(最大反射率与最小反射率之差)介于0.71%~5.78%之间,其光学性质类似于二轴光性体。非颗粒状结构笔石表皮体的最大反射率经校正后,渝东南地区五峰组—龙马溪组的等效镜质体反射率值介于2.75%~4.72%之间;而渝东北城口和巫溪地区五峰组—龙马溪组的等效镜质体反射率值分别为1.05%~1.17%和5.42%~5.58%。渝东北巫溪和渝东南五峰组—龙马溪组样品处于过成熟热演化阶段,而渝东北城口五峰组—龙马溪组样品仍处于成熟热演化阶段。 | 罗情勇 郝婧玥 李可文 戴娜 栾进华 程礼军 张志平 胡科 钟宁宁 | 2017 | 天然气地球科学2017，28，12： | 4 |
| 2 | Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone显示文摘Sesquiterpanes are ubiquitous components of crude oils and ancient sediments.Liquid saturated hydrocarbons from simulated pyrolysis experiments on immature organic-rich mudstone collected from the Lower Cretaceous Hesigewula Sag were analyzed by gas chromatography-mass spectrometry(GC-MS).C14 bicyclic sesquiterpanes,namely,8β(H)-drimane,8β(H)-homodrimane,and 8 a(H)-homodrimane were detected and identified on basis of their diagnostic fragment ions(m/z123,179,193,and 207),and previously published mass spectra data,and these bicyclic sesquiterpanes presented relatively regular characteristics in their thermal evolution.The ratios 8β(H)-drimane/8β(H)-homodrimane,8β(H)-homodrimane/8 a(H)-homodrimane,and 8β(H)-drimane/8 a(H)-homodrimane all show a clear upward trend with increasing temperature below the temperature turning point.Thus,all these ratios can be used as evolution indexes of source rocks in the immature-lowmaturity stage.However,the last two ratios may be more suitable than the first ratio as valid parameters for measuring the extent of thermal evolution of organic matter in the immature-low-maturity stage because their change amplitude with increasing temperature is more obvious. | Gang Yan Yao-Hui Xu Yan Liu Peng-Hai Tang Wei-Bin Liu | 2019 | Petroleum Science2019，16，3： | 3 |
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