大巴山前构造带油气苗分布及油气成藏特征  

Distribution of Oil-Gas Seepages and Characteristics of Pool Forming at Dabashan Piedmont Structural Belt

作　　者：段金宝[1] 张庆峰[1] 范小军[1] Duan Jinbao Zhang Qingfeng Fan Xiaojun(Exploration Research Institute of Sinopec Exploration Company, Chengdu 610041, China)

机构地区：[1]中国石油化工股份有限公司勘探分公司研究院,成都610041

出　　处：《地质科技情报》2016年第5期163-167,共5页Geological Science and Technology Information

基　　金："十二五"国家重大专项大型油气田及煤层气子课题"南方海相碳酸盐岩大中型油气田形成规律与勘探评价"(2011ZX05005-003)

摘　　要：大巴山前构造带构造变形强烈,油气成藏过程复杂,勘探程度低。从地表油气显示分布特征分析入手,结合露头烃源岩与含烃流体包裹体资料,探讨了大巴山前构造带油气成藏演化过程。研究结果表明:大巴山前构造带油气成藏演化具有"递进变形、油气分带、差异成藏"的特征;大巴山前构造带的构造由北东向西南呈现多期递进变形特征,并相应控制了油气的分带性,其中冲断带主要分布油气苗,滑脱褶皱带见沥青与气藏;根据大巴山前构造带不同区带油气藏成藏时序与油气藏后期改造的差异性,总结出3种油气成藏类型,即破坏型、局部残存型和内部调整型,其中铁溪-万源滑脱褶皱带属于内部调整型,油气勘探潜力大。With the characteristics of strong tectonic deformation and complex oil-gas accumulation process,the exploration degree in Dabashan piedmont structural belt is relatively low.This paper starts with the analysis of oil-gas seepages distribution characteristics,together with the information of outcrop source rock and hydrocarbon inclusion to discuss the pool forming and evolution process in Dabashan piedmont structural belt.The pool forming and evolution process has the characteristics of progressive deformation,oil-gas forming zonation and petroleum different accumulation.The structural features of multiphase expanded progressive deformation from northeast to southwest lead to the oil-gas forming zonation so that oil-gas seepages are mainly distributed in the thrust belt,asphalt and gas pool,mainly distributed in detachment-fold belt.According to the hydrocarbon forming time and sequence at different belts and differences of pool＇s late reformation,three types of hydrocarbon accumulation were summarized：hydrocarbon pool late destruction type,partly remaining type and internal adjusting type.The Tiexi-Wanyuan detachment-fold belt,belonging to the internal adjusting hydrocarbon accumulation type,is assumed to have a great oil and gas exploration potential.

关 键 词：大巴山前构造带 油气苗 递进变形 油气分带 差异成藏 

分 类 号：TE122.3[石油与天然气工程—油气勘探]