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Origin and accumulation of natural gas in the Ningbo Tectonic Zone in the Xihu Sag

机译：西湖凹陷宁波构造区天然气的起源和积累

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摘要

In this study, the geochemical characteristics of the oil and gas and the related source rocks in the Ningbo Tectonic Zone in the Xihu Sag are analysed to determine the source of the natural gas. The natural gas in the Ningbo Tectonic Zone is dry gas. It has a high content of methylcyclohexane and low contents of n-heptane and dimethylcyclopentane in the C_7 light hydrocarbons and a heavy ethane-carbon isotope composition, indicating that the natural gas in the study area was derived from humic parent material, making it a coal-type gas. The ratios of the light hydrocarbon parameters of the NB-A and NB-B natural gas are significantly different from those of crude oil and the Pinghu Formation source rocks, indicating that there is no pronounced relationship between the natural gas and the Pinghu Formation source rocks, and the natural gas may be from the source rocks in the deeper horizons of the Pinghu Formation. The homogeniza-tion temperatures of the fluid inclusions in the upper member of the Huagang Formation (NB-A1) are mainly 140-150°C, which correspond to 3.5-0 Ma (Late Cenozoic) according to the paleo-geothermal history, indicating that in this area, the natural gas in the upper member of the Huagang Formation has charged since the sedimentary period of the Santan Formation.
机译：在本研究中，分析了石油凹陷中宁波构造区的石油和气体的地球化学特性，以确定天然气的来源。宁波构造区的天然气是干燥的气体。它具有高含量的甲基环己烷和低庚烷和二甲基环戊烷的高含量和重质乙烷 - 碳同位素组合物，表明研究区域中的天然气源自腐殖质母体材料，使其成为煤炭 - 型气体。 Nb-A和Nb-B天然气的光烃参数的比率与原油和平湖形成源岩的比例显着差异，表明天然气与平湖形成源岩之间没有明显的关系而且天然气可能来自施林较深的地平线中的源岩。华昌地层上部成员（NB-A1）中的流体夹杂物的均匀化温度主要是140-150℃，根据古地热历史，对应于3.5-0 mA（晚新生代），表明在这一领域，自沉积期形成以来，华昌地层上部成员的天然气已经充电。

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  • 来源
    《Oceanographic Literature Review》 |2021年第6期|1291-1291|共1页
  • 作者

    D. He; Y. Tang; R. Shi;

  • 作者单位

    Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University) Ministry of Education Wuhan 430100 China;

    Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University) Ministry of Education Wuhan 430100 China;

    Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University) Ministry of Education Wuhan 430100 China;

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