海相油气地质2017，Vol.22Issue(2)：31-39,9.DOI:10.3969/j.issn.1672-9854.2017.02.005
鄂尔多斯盆地西南部长8段砂岩沥青
地球化学特征及其来源分析
Geochemical Characteristics and Oil-source Correlation of Bitumen in Sandstone of Chang-8 Member in Southwestern Ordos Basin
王自翔 1王永莉 2孙则朋 2朱深圳 3汪亘 2徐亮 3孙丽娜2
作者信息
- 1. 中国石油化工股份有限公司江汉油田分公司
- 2. 中国科学院地质与地球物理研究所兰州油气资源研究中心/中国科学院油气资源研究重点实验室
- 3. 中国科学院大学
- 折叠
摘要
Abstract
21 bituminous sandstone samples of Chang-8 member in southwestern Orders Basin were collected, and the biomarkers of bitumen were detected by means of GC-MS. The compositional and distributional characteristics of biomarker compounds of bitumen samples were studied and the origin of bitumen is discussed. The result shows that:(1) The relative content of tetracyclic terpane to hopanes and C29 regular steranes to C27 are high, C24 tetracyclic terpane/(C24 tetracyclic terpane+C26 tricyclic terpane) ranges from 0.26 to 0.52,C23 tricyclic terpane/(C23 tricyclic terpane+C30 hopanes) ranges from 0.06 to 0.41, these data indicate that their organic parent materials are mixed ones and the higher land plants make a great contribution to the oil generation. (2) The low-content ofβ-carotane, gammacerane and C30+hopanes,and that the ratio of Pr/Ph is 0.67~1.07,indicate that the oil was formed under the weak oxidizing to weak reducing freshwater or brackish-water lacustrine environment. (3) Several ratios, including C31 hopanes 22S/(22S+22R),C29 sterane 20S/(20S+20R),C29 sterane ββ(/αα+ββ) and C29 diasterane 20S/(20S+20R), completely or almost completely reached such equilibrium value that it indicates the studied bitumens are mature. The results of oil-source rock correlation show that the geochemical characteristics of bitumen in sandstone of Chang-8 Member from southwest area of Ordos Basin are similar to those of the upper Triassic Chang-7 subsection, so it is proposed that the bitumen originated mainly from the Chang-7 source rock.关键词
鄂尔多斯盆地/延长组8段/沥青/烃源岩/生物标志化合物/油源对比Key words
Bitumen/Source rock/Biomarkers/Oil-source correlation/Ordos Basin分类
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王自翔,王永莉,孙则朋,朱深圳,汪亘,徐亮,孙丽娜..鄂尔多斯盆地西南部长8段砂岩沥青
地球化学特征及其来源分析[J].海相油气地质,2017,22(2):31-39,9.
