摘要
本文根据中国大地构造环境、古地理轮廓、沉积岩相与地层层序特征研究了我国侏罗系的分布、层序及岩相,并分析了我国侏罗系的含油气地质条件。作者以贺兰山—龙门山—康滇隆起—哀牢山为界将中国侏罗纪沉积区分为东西两部分,东部以北东、北北东向的断陷盆地群为主,西部则以近东西向的山间盆地为主。侏罗纪早期东部沿海一带为太平洋的一部分,东部内陆区为裂谷型断陷—坳陷和内陆坳陷型盆地;西部的西藏区为海相沉积区,新疆为内陆沉积区,其他区为山间盆地沉积区。侏罗纪晚期,由于东部陆壳继续抬升,太平洋板块向大陆俯冲,使得中国东部火山活动非常剧烈,在盆地中形成了大量的火山岩层或火山—沉积岩层。中国西部西藏地区仍为海域,但范围缩小。其余沉积盆地由于地壳上升和长期沉积而变浅,沉积了一套红色碎屑物质。作者在分析了侏罗纪的构造环境和沉积条件后指出,侏罗系不但是我国的一个重要成煤层系,而且也是一个重要的含油气层系,有着广阔的含油气前景。
Based on the characteristics of tectonic setting, palaeogeographic outline, sedimental lithofacies and stratigraphicsequence in China, the study and analysis of distribution sequence and lithofacies of Jurassic and its petroliferous geo-logic conditions has been made. The Jurassic sedimentary provinces, bounded with Helan Mt. -Longmen Mt. -Kangdian uplift-Ailao Mt. are divided by the authors into eastern and western parts. The east is dominated by north- east, north- north- east oriented faulted basins, the west by near east- west oriented intermontane basins. Inearly Jurassic, the coastline area in the east became a part of the Pacific, while the inland province became rift faults- depressions and inland depressed basins; Xizang(Tibet) area in the west was marine sedimentary province, Xin-jiang was inland one while the others were all intermontane basin sedimentary province. In late Jurassic, as upliftingof the eastern continental crust and the Pacific plate subducted toward the continent, fierce volcanic activities occurredin thd east, forming a large of volcanic rocks or volcanic- sedimentary rocks in the basins. During that period,Xizang province remained as the same, but the ocean area became smaller, the other basins would become shalloweras a result of crust uplifting and long-term depositing, thus a set of red clastic substances were formed. Having ana-lyzed tectonic setting and sedimentary environment of Jurassic, the authors point out that Jurassic is not only a domi-nant coal-generated sequence, but also is an important petroliferous one, having extensively favorable petroliferousprospects.
出处
《新疆石油地质》
CAS
CSCD
北大核心
1993年第2期101-116,共16页
Xinjiang Petroleum Geology
关键词
侏罗纪
岩相
古地理
含油气
油气藏
Jurassic
Palaeogeography
Paleoclimate-paleobiocoenosis
Rift fault-depression basin
Inland depressed basin
Intermontane basin
