四川盆地二叠系和三叠系礁滩天然气富集规律与勘探方向

doi:10.11743/ogg20140301

摘要/Abstract

摘要：

通过系统的天然气组分、碳同位素以及微观薄片、包裹体分析，明确了二叠系和三叠系礁滩气藏中天然气主要为原油二次裂解气，龙潭组（吴家坪组）为天然气藏的主力烃源岩层，气藏经历了早期岩性古油藏聚集、古原油裂解和天然气调整再聚集3个阶段；天然气藏（田）具有多元供烃、近源聚集、岩性控藏、气油转化、晚期调整的成藏富集模式，现今气藏的富集主要受控于3个方面：一是二叠系烃源岩的生烃灶分布控制了油气来源的充足程度；二是礁滩相储层的分布与规模控制了油气聚集的场所与规模；三是晚期保存条件决定了天然气的最终聚集。通过系统总结已发现礁滩气藏（露头）沉积储层、油气富集规律，进一步探讨了下步勘探发展的方向，认为长兴组、飞仙关组和嘉陵江组台缘礁滩、台内浅滩和下二叠统浅滩勘探领域仍存在良好勘探前景。

关键词: 碳酸盐岩, 礁滩气藏, 二叠系, 三叠系, 四川盆地

Abstract:

Through systematic analysis of gas component,carbon isotope,thin section and inclusions,we found that the Permian and Triassic reef-bank reservoirs are dominated by natural gas from secondary cracking of crude oil.The Longtan Formation(Wujiaping Formation)is the major source rocks.The gas reservoirs experienced three stages,namely earlier oil accumulation in ancient lithologic reservoirs,ancient crude oil cracking and gas adjusting and re-accumulation.The hydrocarbon accumulation pattern is characterized by multiple hydrocarbon supply,accumulation near the source,lithology reservoirs,oil-gas conversion and later adjustment.And the present day gas reservoirs are mainly controlled by three factors.Firstly,the hydrocarbon kitchen of the Permian source rock controls the adequacy of oil-gas source.Secondly,the distribution and scale of reservoirs of reef-bank facies control the scale and location of hydrocarbon accumulation.Thirdly,later preservation conditions determine the finally accumulation of gas.By systematically summarizing the sedimentary characteristics and hydrocarbon accumulation conditions of the discovered reef-bank gas reservoirs(outcrops),we believe that reservoirs of platform margin reef-bank facies,intra-platform shoal facies and the Lower Permian shoal facies are the favorable targets for further gas exploration.

Key words: carbonate rock, reef-bank gas reservoir, Permian,Triassic, Sichuan Basin

中图分类号:

TE122.3

郭旭升,黄仁春,付孝悦,等. 四川盆地二叠系和三叠系礁滩天然气富集规律与勘探方向[J]. 石油与天然气地质, 2014, 35(3): 295-302. doi: 10.11743/ogg20140301 Guo Xusheng,Huang Renchun,Fu Xiaoyue,et al. Gas accumulation and exploration direction of the Permian and Triassic reservois of reef-bank facies in Sichuan Basin[J]. Oil & Gas Geology, 2014, 35(3): 295-302. doi: 10.11743/ogg20140301

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