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首页> 外文期刊>Journal of Asian earth sciences >The upper limit of maturity of natural gas generation and its implication for the Yacheng formation in the Qiongdongnan Basin, China
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The upper limit of maturity of natural gas generation and its implication for the Yacheng formation in the Qiongdongnan Basin, China

机译：琼东南盆地天然气成藏的上限及其对崖城组的意义

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摘要

Vitrinite reflectance (VR, Ro%) measurements from residual kerogen of pyrolysis experiments were per-formed on immature Maoming Oil Shale substituted the samples for the gas-prone source rocks of Yach-eng formation of the Qiongdongnan Basin in the South China Sea. The work was focused on determination an upper limit of maturity for gas generation (ULMGG) or "the deadline of natural gas gen-eration". Ro values at given temperatures increase with increasing temperature and prolonged heating time, but ARo-value, given a definition of the difference of all values for VR related to higher temperature and adjacent lower temperature in open-system non-isothermal experiment at the heating rate of 20 ℃/ min, is better than VR. And representative examples are presented in this paper. It indicates that the range of natural gas generation for Ro in the main gas generation period is from 0.96% to 2.74%, in which ARo is in concordance with the stage for the onset and end of the main gas generation period correspond-ing to 0.02% up to 0.30% and from 0.30% up to 0.80%, respectively. After the main gas generation period of 0.96-2.74%, the evolution of VR approach to the ULMCG of the whole rock for type II kerogen. It is equal to 4.38% of VR, where the gas generation rates change little with the increase of maturation, ARo is the maximum of 0.83% corresponding to VR of 4.38%Ro, and the source rock does not nearly occur in the end process of hydrocarbon gas generation while Ro is over 4.38%. It shows that it is the same the ULMGG from the whole rock for type II kerogen as the method with both comparison and kinetics. By comparing to both the conclusions of pyrolysis experiments and the data of VR from the source rock of Yacheng for-mation on a series of selected eight wells in the shallow-water continental shelf area, it indicate that the most hydrocarbon source rock is still far from reaching ULMGG from the whole rock for type II kerogen. The source rock of Yacheng formation in the local areas of the deepwater continental slope basin have still preferable natural gas generative potential, especially in the local along the central depression belt (namely the Ledong, Lingshui, Songnan and Baodao sags from southwest to northeast) from the depocen-ter to both the margin and its adjacent areas. It help to evaluate the resource potential for oil and gas of the hydrocarbon source rock in the deepwater continental slope of the Qiongdongnan Basin or other basins with lower exploration in the northern of the South China Sea and to reduce the risk in exploration.
机译：在未成熟的茂名油页岩上用热分解实验的残余干酪根测量玻璃体反射率（VR，Ro％），以代替样品的样本来替代南海琼东南盆地Yach-eng组易生气源岩。这项工作的重点是确定天然气发电的成熟上限（ULMGG）或“天然气发电的期限”。给定温度下的Ro值随温度的升高和加热时间的延长而增加，但是ARo值（给定了在升温速率下开放系统非等温实验中VR的所有值与高温和邻近的低温相关的所有差值的定义） 20℃/ min，优于VR。并给出了代表性的例子。结果表明，Ro在主产气期间的天然气生成范围为0.96％至2.74％，其中ARo与主产气开始和结束阶段相对应，为0.02。 ％分别高达0.30％和0.30％至0.80％。在主产气量为0.96-2.74％之后，对于II型干酪根，VR方法演变为整个岩石的ULMCG。等于VR的4.38％，其中随着成熟度的增加，产气率变化不大，ARo的最大值为0.83％，对应的VR为4.38％Ro，且烃源岩几乎没有发生在末段。碳氢化合物的产生而Ro超过4.38％。结果表明，与用于比较和动力学的方法相比，用于II型干酪根的整个岩石的ULMGG相同。通过对浅水陆架地区一系列选定的8口井的一系列热解实验的结论和Yacheng格式烃源岩的VR数据进行比较，表明大部分烃源岩仍较远。从整个岩石中到达II型干酪根的ULMGG。深水大陆斜坡盆地局部地区的崖城组烃源岩仍具有较好的天然气成藏潜力，特别是在中部凹陷带（西南至东北为乐东，陵水，松南和宝岛凹陷）附近。对边缘及其相邻区域的部署。它有助于评估琼东南盆地或其他南海北部勘探程度较低的盆地的深水大陆坡烃源岩的油气资源潜力，并降低勘探风险。

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  • 来源
    《Journal of Asian earth sciences》 |2012年第2012期|p.203-213|共11页
  • 作者

    Long Su; Jianjing Zheng; Guojun Chen; Gongcheng Zhang; Jianming Guo; Yongchang Xu;

  • 作者单位

    Key Laboratory of Petroleum Resources Research, Institute of Ceology and Geophysics, Chinese Academy of Sciences, Lanzhou, Cansu 730000, PR China,Graduate University of the Chinese Academy of Sciences, Beijing 100039, PR China;

    Key Laboratory of Petroleum Resources Research, Institute of Ceology and Geophysics, Chinese Academy of Sciences, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Petroleum Resources Research, Institute of Ceology and Geophysics, Chinese Academy of Sciences, Lanzhou, Cansu 730000, PR China;

    Research Institute of China National Offshore Oil Corporation, Beijing 100027, PR China;

    Key Laboratory of Petroleum Resources Research, Institute of Ceology and Geophysics, Chinese Academy of Sciences, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Petroleum Resources Research, Institute of Ceology and Geophysics, Chinese Academy of Sciences, Lanzhou, Cansu 730000, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hydrocarbon source rock; yacheng formation; pyrolysis experiment; upper limit of maturity for natural gas; generation; qiongdongnan basin;

    机译：烃源岩崖城组热解实验天然气的成熟上限;代;琼东南盆地;

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