试论大巴地区的油气远景——据秦岭-大巴地区的构造演化和油源岩的地球化学特征

ON OIL AND GAS PROSPECTS OF DABA AREA

高长林

Gao Changling

地质矿产部石油地质中心实验室

Central Laboratory of Petroleum Geology, Minstry of Geology and Mineral Resources

作者把过对秦—巴地区各层系的地球化学特征的研究,得出在该拗拉槽的昌盛阶段,其南翼发育有良好的油源岩;据其构造演化在陕南—川东北发育有—规模巨大的逆冲系。认为秦—巴拗拉槽的南翼部分与其接壤的扬子地台部位和分布于大巴山区的逆冲系是寻找油气的两个重要领域。

The author of this paper studies the tectonic evolution of Qingling-Daba Region and the organie geochemical characteristics of the source rocks in the area.More detail analysis have been made on the evolutionary regularities of the source rocks during the time of the tectonic development. It comes to the following conclusions. 1.The auiacogen there is a typical paleozoic protobasin developed from Sinian to Triassic time. The evolution of the basin can be devided into three stages and subdevided into six episodes.The source rocks developed mainly from Cambrian to Silurian (the most active growing period of the aulacogen) are claystones and carbonate rocks with a large thickness, high organic content,excellent kerogen type and high oil/gas generating potential. Although the organic matter is locally overmature, it is considered that the southern flank of the aulacogen and the adjacent part of Yangtze Platform are the favourable area for oil/gas exploration 2.The southern Shaanxi-northeastern Sichuan overthrust system is a major system. Its history of development and formation can be devided into 4 stages and the main stage is from Late Yenshanian to Himalayan time. It is believed that such a overthrust system is a significant frontier for oil/gas exploration.

https://doi.org/10.11781/sysydz198803213