川中隆起安岳气田古油藏成藏时间厘定

doi:10.11743/ogg20200306

摘要/Abstract

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

中图分类号:

TE122.3

杨程宇,文龙,王铁冠,等. 川中隆起安岳气田古油藏成藏时间厘定[J]. 石油与天然气地质, 2020, 41(3): 492-502. doi: 10.11743/ogg20200306 Yang Chengyu,Wen Long,Wang Tieguan,et al. Timing of hydrocarbon accumulation for paleo-oil reservoirs in Anyue gas field in Chuanzhong Uplift[J]. Oil & Gas Geology, 2020, 41(3): 492-502. doi: 10.11743/ogg20200306

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