柴达木盆地北缘中、下侏罗统烃源岩生烃潜力

新疆石油地质 ›› 2009, Vol. 30 ›› Issue (1): 21-24.

柴达木盆地北缘中、下侏罗统烃源岩生烃潜力

曹剑¹, 边立曾¹, 刘云田^1,2, 胡凯¹, 杨少勇², 汪立群², 陈琰², 孙平安¹

1.南京大学地球科学系,南京 210093;
2.中国石油青海油田分公司,甘肃敦煌 736202

出版日期:2009-02-01 发布日期:2020-08-21
作者简介:曹剑（1978-）,男,江苏姜堰人,博士,石油地质, （E-mail）jcao@nju.edu.cn.
基金资助:
国家自然科学基金项目（40602014,40638042）资助

Hydrocarbon Generative Potentials of Middle and Lower Jurassic Source Rocks in Northern Margin of Qaidam Basin

CAO Jian¹, BIAN Li-zeng¹, LIU Yun-tian^1,2, HU Kai¹, YANG Shao-yong², WANG Li-qun², CHENYan², SUN Ping-an¹

1. Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093, China;
2. Qinghai Oilfield Company, PetroChina,Dunhuang, Gansu 736202, China

Online:2009-02-01 Published:2020-08-21

摘要/Abstract

摘要： 通过对柴达木盆地北缘中、下侏罗统烃源岩地球化学特征的详细对比分析表明,中侏罗统的沉积范围大于下侏罗统,且水体更深,构成了更大范围的连通湖盆。中侏罗统烃源岩生烃母质中的藻类体丰度较下侏罗统烃源岩的高,而角质体含量相对较低。据此,中侏罗统烃源岩的有机质类型好于下侏罗统烃源岩。但根据现今残余烃源岩的分布和有机质丰度特征,下侏罗统烃源岩的生烃基础却好于中侏罗统,前者在生烃凹陷区目前已进入高过成熟演化阶段（R _o >2.0%）,而后者在不同构造单元以差异热演化为特征。综合对比分析认为,两套烃源岩均具有良好的生烃潜力,在今后的油气勘探和地质研究中,应将两套烃源岩置于同等重要位置。

关键词: 柴达木盆地, 北缘, 侏罗系, 烃源岩, 成烃特征, 生烃潜力

Abstract: The Middle and Lower Jurassic coal-bearing mudstone source rocks occur widely in the northern margin of Qaidam basin. The depositional area in the Middle Jurassic is larger than that in the Lower Jurassic, with a relatively deeper water depth. This indicates that the lake boundary of the Middle Jurassic is wider. Also, the Middle Jurassic source rock has a higher abundance of algae and a lower abundance of cutinite than the Lower Jurassic source rock, showing that the Middle Jurassic source rock is better than the Lower Jurassic one in organic matter type. However, the distribution of present-day residual source rock and the total organic carbon abundance indicate that the hydrocarbon generative potential of the Lower Jurassic source rock is better than that of the Middle Jurassic one. Because the Lower Jurassic source rock has entered into highly maturated evolution stage (R _o >2.0%), the Middle Jurassic one is dominated by differential thermal evolution in different structural elements. Therefore, both the Lower and Middle Jurassic source rocks are all in good hydrocarbon generative potentials. This implies that not only the Lower Jurassic source rock, but also the Middle Jurassic ones should be equally placed enough importance for petroleum geological research and exploration in the future.

Key words: Qaidam basin, northern margin, Jurassic, source rock, hydrocarbon-forming feature, hydrocarbon generative potential

中图分类号:

TE112.114

曹剑, 边立曾, 刘云田, 胡凯, 杨少勇, 汪立群, 陈琰, 孙平安. 柴达木盆地北缘中、下侏罗统烃源岩生烃潜力[J]. 新疆石油地质, 2009, 30(1): 21-24.

CAO Jian, BIAN Li-zeng, LIU Yun-tian, HU Kai, YANG Shao-yong, WANG Li-qun, CHENYan, SUN Ping-an. Hydrocarbon Generative Potentials of Middle and Lower Jurassic Source Rocks in Northern Margin of Qaidam Basin[J]. Xinjiang Petroleum Geology, 2009, 30(1): 21-24.

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