| 摘要: |
| 本文通过对湘中地区早寒武世岩相古地理的研究,认为早寒武世期间,湘中地区为发育在陆架之上的缺氧滞留盆地沉积环境,沉积了一套以黑色炭质板状页岩及含硅质炭质泥岩等为主的黑色沉积。该套黑色沉积沿着湘中地区以及扬子东南缘呈带状稳定分布,反映出当时湘中地区是一"富烃沉积区",具有生烃潜力;该套寒武纪海相地层是油气勘探的重要层位。 |
| 关键词: 烃源岩 沉积环境 岩相古地理 湘中地区 早寒武世 |
| DOI： |
| 附件 |
| 投稿时间：2011-05-08修订日期：2011-07-19 |
| 基金项目:国家重大科技专项“全国油气基础地质编图”(2008ZX05043-005)、中国地质调查局项目“中国岩相古地理编图”(1212010916060) |
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| Sedimentary environments of the Lower Cambrian source rocks in central Hunan |
| LIANG Wei, MOU Chuan-long, ZHOU Ken-ken, GE Xiang-ying |
(1. Academy of Chinese Geological Sciences, Beijing 100037, China;
2. Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, Sichuan, China;
3. College of Geology, Shandong University of Science and Technology, Qingdao 266510, Shandong, China) |
| Abstract: |
| Tectonically, central Hunan lies on the southeastern margin of the middle-upper Yangtze plate. During the Early Cambrian, this region was in a relatively stable cratonic basin. The integration of upwelling oceanic currents, sea-level rises and anoxic events gave rise to the formation of the favourable environments for the generation of source rocks. Throughout the Early Cambrian, the central Hunan region was once developed as the anoxic stagnant basin above the continental shelf, and composed of a succession of black deposits comprising black carbonaceous tabular shales and siliceous-carbonaceous mudstones. The black deposits extend from the central Hunan region to the whole southeastern margin of the middle-upper Yangtze plate, implying that the study area was then enriched in hydrocarbons, and thus has great hydrocarbon potential. This region is selected as a key area not only for basic geological survey and oil and gas exploration, but also for the exploration of shale gas. |
| Key words: source rock sedimentary environment sedimentary facies and palaeogeography central Hunan Early Cambrian |
