石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (3): 492-502.doi: 10.11743/ogg20200306

• 油气地质 • 上一篇    下一篇

川中隆起安岳气田古油藏成藏时间厘定

杨程宇1, 文龙2, 王铁冠1, 罗冰2, 李美俊1,3, 田兴旺2, 倪智勇1   

  1. 1. 油气资源与探测国家重点实验室 中国石油大学(北京), 北京 102249;
    2. 中国石油 西南油气田分公司 勘探开发研究院, 四川 成都 610041;
    3. 长江大学 资源与环境学院 油气资源与勘探技术教育部重点实验室, 湖北 武汉 430100
  • 收稿日期:2019-04-30 修回日期:2020-03-27 发布日期:2020-06-16
  • 作者简介:杨程宇(1987-),男,博士后,油藏地球化学。E-mail:cmbruceyoung@163.com。
  • 基金资助:
    国家自然科学基金青年科学基金项目(41903059)。

Timing of hydrocarbon accumulation for paleo-oil reservoirs in Anyue gas field in Chuanzhong Uplift

Yang Chengyu1, Wen Long2, Wang Tieguan1, Luo Bing2, Li Meijun1,3, Tian Xingwang2, Ni Zhiyong1   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Exploration and Development Research Institute of Southwest Oil & Gas Field Branch Company Ltd., PetroChina, Chengdu, Sichuan 610041, China;
    3. Key Laboratory of Oil and Gas Resources and Exploration Technology(Yangtze University), Ministry of Education, Wuhang, Hubei 430100, China
  • Received:2019-04-30 Revised:2020-03-27 Published:2020-06-16

摘要: 安岳气田是中国目前最大的古老和深层气田,由新元古代—早古生代地层中的古油藏经原位裂解形成。由于古油藏-裂解气藏演化程度较高、时代较老,对其成藏演化的研究,特别是古油藏成藏时间的厘定,长期以来存在较多争议,缺乏足够地球化学证据的佐证。通过最新的实测大地热流史和类似地区的烃源层生烃门限研究,利用地质类比法替代流体包裹体测温,重建关键井埋藏史-热史,厘定德阳-资阳裂陷筇竹寺组烃源层的生烃和古油藏形成和破坏的时间,分析了古油藏的演化过程。地球化学实验和相关地质分析表明,筇竹寺组烃源层生烃时间既古油藏成藏时间约为275~263 Ma,相当于早二叠世后期(孔古阶)—晚二叠世。之后的深埋使古油藏自三叠纪初期开始裂解,在中侏罗世末期—早白垩世初期古油藏被完全破坏并形成大型裂解气藏。

关键词: 埋藏史, 成藏时间, 裂解气藏, 古油藏, 安岳气田, 川中隆起, 四川盆地

Abstract: Anyue gas field,resulted from the in-situ pyrolysis of paleo-oil reservoirs in the Neoproterozoic-Lower Paleozoic sequences,is one of the largest old and deep gas pools in China.Since the paleo oil-pyrolysis gas pools are high in degree of evolution and very old,and there is in lack of geochemical evidences,the accumulation and evolution,especially the timing of accumulation,remains a controversial issue in study.Starting from the newly-measured terrestrial heat flow history and threshold depth of hydrocarbon generation from source rocks in similar areas,we apply geological analogy method,instead of microthermometry of fluid inclusions,to the analysis of paleo-oil reservoir evolution:reconstructing the burial-geothermal history of key wells,and then determining the timing of hydrocarbon generation in the Qiongzhusi Formation source beds in Deyang-Ziyang rift and of paleo-oil reservoirs' formation and destruction.The results of geochemical experiments and relevant geological analyses indicate that hydrocarbon generation in the Qiongzhusi Formation source rock and paleo-oil reservoir formation occurred around 275-263 Ma,corresponding to the late Early Permian-Late Permian.The oil pyrolysis occurred since the early Triassic with deep burial,and the paleo-oil reservoirs were entirely transformed to a pyrolysis gas pools during the late Middle Jurassic-early Early Cretaceous.

Key words: burial history, hydrocarbon accumulation time, pyrolysis gas pool, paleo-oil reservoir, Anyue gas field, Chuanzhong Uplift, Sichuan Basin

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