| 摘要: |
| 在羌塘盆地已经发现了190余处油气显示。近年笔者在盆地北部晚侏罗世地层中发现了迄今最大规模的沥青脉。研究结果表明,该沥青脉产出于上侏罗统索瓦组地层之中,地层下部系与沥青脉的形成有一定关系的中侏罗统夏里组局部含油气显示的盐丘。沥青族组分(%)为:饱和烃5.72、芳烃18.46、沥青质52.37、非烃23.45,说明该沥青脉经过了运移、氧化的过程。同时,沥青脉产出于复背斜范围内,利于油气聚集成藏。这一发现对于羌塘盆地的油气地质的作用具有现实意义。 |
| 关键词: 羌塘盆地 晚侏罗世 沥青脉 |
| DOI： |
| 附件 |
| 投稿时间：2003-02-15 |
| 基金项目: |
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| The discovery and significance of the large-scale asphalt veins in the Qiangtang Basin, northern Xizang |
| DU Bai-wei, TAN Fu-wen, WANG Jian, WANG Xiao-long |
| (Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China) |
| Abstract: |
| The asphalt appeared on the Earth's surface may provide an important information about oil and gas occurrence for the early petroleum exploration. Abundant oil shows were discovered in the Qiangtang Basin, northern Xizang, where the large-scale asphalt veins were recognized in 2002 in the Late Jurassic strata in the northern part of the basin. The asphalt veins occur mostly in the Upper Jurassic Suowa Formation that is underlain by the salt domes locally with oil shows within the Middle Jurassic Xiali Formation. The components of the asphalt group consist of saturated hydrocarbon (5.72%), aromatic hydrocarbon (18.46%), asphalt (52.37%) and nonhydrocarbon components (23.45%). The above-mentioned observations show that the asphalt veins have been subjected to migration and oxidation. The occurrence of the asphalt veins within composite anticlines facilitates the accumulation of oil and gas. The discovery is of significance, implying that the basin is expected to be highly prospective for the oil and gas deposits. |
| Key words: Qiangtang Basin Late Jurassic asphalt veins |
