四川盆地北部侏罗系凉高山组河道砂岩勘探潜力及有利方向  

Exploration potential and favorable targets of channel sandstone in Jurassic Lianggaoshan Formation in northern Sichuan Basin

作　　者：黎承银 李明阳 潘磊[1] LI Chengyin;LI Mingyang;PAN Lei(Exploration Research Institute of Exploration Company,SINOPEC,Chengdu 610041,China)

机构地区：[1]中国石化勘探分公司勘探研究院,四川成都610041

出　　处：《断块油气田》2025年第1期55-62,共8页Fault-Block Oil & Gas Field

基　　金：中国石化重点科技项目“川东地区侏罗系致密砂岩目标优选与勘探关键技术”(P23041)。

摘　　要：四川盆地凉高山组三角洲砂岩油气勘探潜力巨大,巴中1HF井钻探突破证实了川北地区凉高山组河道砂岩具备形成规模油气聚集的优越条件。为进一步明确川北凉高山组勘探潜力并指导后续勘探部署,基于各类地质、地球物理资料,对川北地区侏罗系凉高山组油气成藏条件进行系统分析。研究结果表明,凉高山组油气藏富集高产主要受控于“源、相、源储配置”:1)凉高山组、须家河组暗色泥岩、碳质泥岩等多套烃源岩提供了充足的物质来源,是油气成藏富集的基础。2)水下分流河道砂岩物性好,孔喉规模大,含气性好,有利相带是控制油气藏规模及分布的重要条件。3)川北地区凉高山组河道砂岩发育源储紧邻、近源成藏及断裂输导、混源成藏2种模式,有利的源储配置是油气藏高产的关键因素。4)川北巴中地区具备形成油气规模增储阵地的有利地质条件,是侏罗系下步勘探的主攻方向;通江—马路背地区是“断缝体”气藏拓展的重要目标,是四川盆地侏罗系油气勘探的重要战略新区带。Delta sandstone of Lianggaoshan Formation in Sichuan Basin has great potential of oil and gas exploration.The dilling breakthrough of Well Bazhong 1HF has confirmed that the channel sandstone of Lianggaoshan Formation in northern Sichuan Basin has superior conditions for large-scale oil and gas accumulation.In order to further clarify the exploration potential of Lianggaoshan Formation in northern Sichuan Basin and to guide the subsequent exploration deployment,based on various geological and geophysical data,the conditions for oil and gas accumulation in Lianggaoshan Formation of the Jurassic in northern Sichuan Basin are systematically analyzed.The research results indicate that the enrichment and high production of oil and gas reservoirs of Lianggaoshan Formation are mainly controlled by"source,facies,and source-reservoir configuration":(1)The dark mudstones,carbonaceous mudstones and multiple sets of source rocks in Liangaoshan Formation and Xujiahe Formation provide abundant material sources,which are the basis for hydrocarbon accumulation and enrichment.(2)Sandstone in the underwater distributary channel has large pore-throat scale and good gas-bearing properties.Dominant facies are important conditions for controlling the scale and distribution of oil and gas reservoirs.(3)Channel sandstone of Lianggaoshan Formation in northern Sichuan Basin develops two oil and gas accumulation models:adjacent source-reservoir and near-source accumulation,and fault conduction and mixed-source accumulation.Favorable source-reservoir configuration is the key to high production of oil and gas reservoirs.(4)Bazhong area in northern Sichuan Basin has favorable geological conditions for the formation of large-scale oil and gas production increase field,which is the main target of further exploration for the Jurassic.Tongjiang-Malubei area is an important target for the expansion of the"fault-fracture body"gas reservoir and a new important strategic zone for Jurassic oil and gas exploration in Sichuan Basin.

关 键 词：致密砂岩 勘探潜力 侏罗系 凉高山组 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]