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Mesozoic source rocks and petroleum systems of the northeastern Qaidam basin, northwest China

机译：柴达木盆地东北部中生代烃源岩和石油系统

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The Qaidam basin is a continental petroliferous basin located in northwest China. Its northern sector is an important hydrocarbon province, where one of the earliest oil discoveries in China was made. Although Mesozoic source rocks are understood to be important parts of Qaidam petroleum systems, the identification and distribution of Mesozoic source rocks in the subsurface are poorly understood. Middle Jurassic coal measures and associated shales have long been considered to be the primary Mesozoic source rocks for the northeastern Qaidam basin without any support from subsurface geochemical and geological data. However, new data have been gathered from earlier Mesozoic sediments that were penetrated by the Lengke-1 well, a deep scientific well with a total depth of 5200 m (17,060 ft). The well was drilled on the Lenghu structural belt in 1997 and documented other effective source rocks. Geochemical analyses indicate that Lower Jurassic mudstones are good to excellent source rocks for the commercial oil wells in the Lenghu area. The upper Middle Jurassic shales are very good source rocks for the commercial oil wells in the Yuka area. Two source rock intervals in the northeastern Qaidam basin allow for two petroleum systems to be distinguished, the Lower Jurassic–Lower Jurassic/Tertiary and Middle Jurassic–Upper Jurassic. The Lower Jurassic–Lower Jurassic/Tertiary petroleum system, with a geographical extent of 15,000 km2 (5800 mi2) and a cumulative amount of source rocks between 200 and 700 m (650 and 2300 ft), represents a favorable target for future exploration. The Middle Jurassic–Upper Jurassic petroleum system, however, may have a lower exploration potential because of a smaller area (1500 km2 [580 mi2]) and a thinner cumulative amount of source rocks (100–200 m [330–650 ft]).
机译：柴达木盆地是位于中国西北部的大陆性石油盆地。它的北部地区是重要的碳氢化合物 省，是中国最早的石油发现 之一。尽管中生代烃源被认为是柴达木石油系统的重要组成部分，但人们对地下 中生代烃源岩的识别和分布却知之甚少。长期以来一直认为中侏罗统煤系和相关的 页岩是柴达木盆地东北部的中生代主要的烃源岩，没有地下地球化学的任何支持 。和地质数据。但是，新的 数据是从早期的中生代沉积物中收集的，而这些沉积物 被深深的科学井 穿透了，深度为Lengke-1 5200 m（17,060 ft）。该井于1997年在冷湖构造带上钻了 ，并记录了其他有效的 烃源岩。地球化学分析表明，对于冷湖地区的商品油井而言，下侏罗统泥岩是优良的烃源岩。侏罗纪上层页岩 是尤卡地区 商业油井的很好的烃源岩。柴达木盆地东北部的两个烃源岩层段可以区分两个石油系统，分别为 下侏罗统-下侏罗统/第三纪和中侏罗统-上部 侏罗纪。下侏罗统—下侏罗统/第三纪石油 系统，地理范围为15,000 km 2 （5800 mi 2 ） 和200至700 m（650至2300 ft）之间的烃源岩累积量，代表了未来 勘探的有利目标。但是，中侏罗统—上侏罗统石油 系统可能具有较低的勘探潜力，因为 的面积较小（1500 km 2 [580 mi 2 ]）和更薄的累计 原始岩量（100–200 m [330–650 ft]）。

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  • 来源
    《AAPG Bulletin》 |2004年第1期|00000115-00000125|共11页
  • 作者

    Yongtai Yang; Baomin Zhang; Changyi Zhao; Tianguang Xu;

  • 作者单位

    Department of Geology, University of Toronto, Toronto, Ontario, M5S 3B1, Canadayongtaiy@geology.utoronto.ca;

    Research Institute of Petroleum Exploration & Development (RIPED), Beijing 100083, China;

    Research Institute of Petroleum Exploration & Development, Beijing 100083, China;

    IHS Energy, Houston, Texas 77056tianguang.xu@ihsenergy.com;

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