西南石油大学学报（自然科学版）2025，Vol.47Issue(5)：49-61,13.DOI:10.11885/j.issn.1674-5086.2024.10.17.02
多期构造背景下四川盆地古老天然气成藏机制与勘探方向
Natural Gas Accumulation Mechanisms and Exploration Directions of Ancient Reservoirs in the Sichuan Basin Under Multi-Stage Tectonic Backgrounds
唐宇欣 1肖笛 1赵立可 2罗冰 2周刚 2胡广1
作者信息
- 1. 西南石油大学地球科学与技术学院,四川成都 610500||天然气地质四川省重点实验室,四川成都 610500
- 2. 中国石油西南油气田公司勘探开发研究院,四川 成都 610041
- 折叠
摘要
Abstract
To deepen understanding of the Sinian-Cambrian gas enrichment in the Sichuan Basin and expand exploration fair-ways,this study of the Dengying Formation documents reservoir types and fluid properties under multiple tectonic episodes and quantifies their regional variability.Recurrent deformation generated structural,lithologic and stratigraphic-lithologic compos-ite traps.Extensional intracratonic sags evolved into hydrocarbon kitchens that contain thicker,higher-quality source rocks.The basin interior retains a closed formation-water system,excellent preservation and high gas saturation,whereas the marginal zones retains open meteoric flux,weaker preservation and low saturation.Four accumulation styles are recognized:primary accumulation in Anyue where a paleo-oil pool cracked in situ;residual accumulation in Ziyang where cracked hydrocarbons migrated and were partly stranded;adjusted accumulation in Weiyuan where remigration led to entrapment elsewhere;and de-stroyed accumulation in Sangmuchang where the paleo-pool was breached and dispersed.Primary accumulations exhibit the most favourable formation and preservation conditions,followed by adjusted ones.Tectonic stability is the key control on gas retention in these ancient strata;the northern and southern slopes of the central Sichuan paleo-uplift are the premier fairways for primary and adjusted pools and constitute the focus of future exploration.关键词
天然气/构造运动/生烃演化/成藏演化/震旦系灯影组/四川盆地Key words
natural gas/tectonic movement/hydrocarbon generation evolution/petroleum accumulation evolution/Sinian Dengying Formation/Sichuan Basin分类
石油、天然气工程引用本文复制引用
唐宇欣,肖笛,赵立可,罗冰,周刚,胡广..多期构造背景下四川盆地古老天然气成藏机制与勘探方向[J].西南石油大学学报（自然科学版）,2025,47(5):49-61,13.
