地学前缘 ›› 2016, Vol. 23 ›› Issue (5): 127-134.DOI: 10.13745/j.esf.2016.05.014

• 油气成藏 • 上一篇    下一篇

柴达木盆地西部地区古近系—新近系天然气成藏期次研究

 刘军, 刘成林, 董清源, 孙平   

  1. 1. 中国石油青海油田公司 勘探事业部, 甘肃 敦煌 736202
    2. 中国地质科学院 地质力学研究所, 北京 100081
    3. 中国地质科学院 页岩油气调查评价重点实验室, 北京 100081
    4. 中国石油化工股份有限公司 石油物探技术研究院, 江苏 南京 211103
    5. 中国石油勘探开发研究院 廊坊分院, 河北 廊坊 065007
  • 收稿日期:2015-10-17 修回日期:2016-01-19 出版日期:2016-09-15 发布日期:2016-09-15
  • 通讯作者: 刘成林(1970—)，男，博士，研究员，从事油气成藏与资源评价等研究工作。E-mail: liuchenglin@cags.ac.cn
  • 作者简介:刘军(1988—)，男，硕士，助理工程师，主要从事现场地质研究与管理工作。
  • 基金资助:

    国家自然科学基金项目“氯化盐浓度对气源岩生成天然气组成的影响”(41272159)

A study of the period of the gas accumulation of PaleogeneNeogene in Western Qaidam Basin.

 LIU  Jun, LIU  Cheng-Lin, DONG  Qing-Yuan, SUN  Beng   

  1. 1. Exploration Enterprise Department, PetroChina Qinghai Oilfield Company, Dunhuang 736202, China
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    3. Key Laboratory of Survey and Assessment of Shale Oil & Gas, Chinese Academy of Geological Sciences, Beijing 100081, China
    4. Geophysical Research Institute, SINOPEC, Nanjing 211103, China
    5. Langfang Branch, Research Institute of Petroleum Exploration and Development of PetroChina, Lanfang 065007, China
  • Received:2015-10-17 Revised:2016-01-19 Online:2016-09-15 Published:2016-09-15

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摘要：

近年来在柴达木盆地西部地区古近系—新近系地层发现了较多的天然气，但已探明的天然气储量与天然气资源量相差甚远；这就需要把资源量转化为储量，需要加强天然气的生成、运移及富集规律等基础地质研究，其中又以天然气成藏期次研究最为重要。因此，文中以柴达木盆地西部地区古近系—新近系地层为重点研究对象，采集了柴西地区大量的包裹体样品并测试了其均一温度，收集和分析了研究区不同构造带的22个包裹体样品均一温度数据，在此基础上结合盆地模拟、圈闭演化对工区天然气成藏期次进行了研究，为下一步的天然气勘探提供了依据。研究结果表明：柴达木盆地西部地区古近系—新近系烃源岩的主力生烃期为N12末—N22时期和N32末—Q时期；圈闭形成发育期贯穿整个古近系和新近系，天然气成藏期晚于圈闭形成期，结合生烃史认为其成藏期在N1末时期以后；流体包裹体均一温度与地温史和埋藏史曲线也证实研究区至少存在两期油气充注，即N1末—N12初和N22末—N32初。总之，柴达木盆地西部地区古近系—新近系天然气具有多期生烃、晚期成藏的特点；其主要成藏期为N1末—N12初期和N22末—N32初期，具有明显的长期性和阶段性。最后提出建议，即围绕中浅层N1末—N12初期和N22末—N32初期气藏进行勘探部署，为研究区的天然气勘探开发打开一个新场面。

关键词: 柴达木盆地西部地区, 天然气, 盆地模拟, 圈闭演化, 均一温度, 成藏期次

Abstract:

In recent years, there are found much natural gas in the PaleogeneNeogene strata of Western Qaidam Basin, but the proved reserves of natural gas are far less than the natural gas resources. This needs to turn resources into reserves and enhance the basic geological research of the natural gas generation, migration and accumulation rules, in which the period of gas accumulation research is the most important. Therefore, in this paper, the PaleogeneNeogene strata of Western Qaidam Basin are selected as the main research object. Based on gathering many samples in Western Qaidam Basin and testing their homogenization temperatures, collecting and analyzing the homogenization temperatures of 22 fluid inclusions samples from different structural belts in Western Qaidam Basin, we have studied the period of PaleogeneNeogene gas accumulation with basin modeling and trap evolution to provide the basis for further natural gas exploration. The results show that the main hydrocarbon generation periods of PaleogeneNeogene source rocks are final N12N22 stage and final N32Q stage in Western Qaidam Basin; that the period of trap formation and development is throughout Paleogene and Neogene, and gas accumulation period is later than trap formation, considering after final N1 combined with hydrocarbon generation history; that the homogenization temperatures of fluid inclusions and the curves of geothermal history and burial history also confirmed that there were at least two times of oil and gas filling in the study area, namely final N1early N12 and final N22early N32. In a word, the characteristics of PaleogeneNeogene natural gas in Western Qaidam Basin are the multistage hydrocarbon generation and later accumulation; and the main periods of gas accumulation in the work area are final N1early N12 stage and final N22early N32 stage, with obvious long accumulation period and stage. Finally we put forward the proposal that exploration deployments should be proceeding around the final N1early N12 stage and final N22early N32 stage of middleshallow gas reservoir, in order to open a new scene for the exploration and development of natural gas in the study area.

Key words: Western Qaidam Basin, natural gas, basin modeling, trap evolution, homogenization temperature, period of accumulation

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