摘要
准噶尔盆地阜康断裂带地处盆地前陆冲断带,构造复杂,勘探难度大。早期仅在中段前缘侏罗系—三叠系获得零星突破。随着阜康断裂带东段二叠系发现亿吨级致密砂岩油藏,证实该带具有多层系含油、立体勘探的资源潜力。本文基于露头、钻测井、地震及有机地球化学、铸体薄片、流体包裹体等分析测试数据,系统解剖阜康断裂带二叠系油气成藏条件。研究表明:(1)二叠系主要发育中二叠统芦草沟组优质烃源岩,源岩厚度大、有机质丰度高,山前带成熟度高,是该区主力烃源岩;(2)围绕芦草沟组烃源岩层,本区发育源上梧桐沟组、源下井井子沟组和乌拉泊组3套碎屑岩储层,纵向叠置、横向连片;(3)受芦草沟组和侏罗系煤系两套滑脱层控制,阜康断裂带南北向发育3排构造带,第一排构造带受妖魔山断裂控制,第二排构造带受阜康断裂控制,第三排构造带受五梁山断裂控制;东西向划分为古牧地、三台及吉南3段,受阜康断裂推覆带构造应力不均衡的影响,自西向东,构造带变形区整体呈“东西宽,中段窄”的特征;(4)该区阜康断裂带发育早期深埋、多期抬升混合充注型、持续埋藏型及早期深埋、晚期抬升型3类油气藏。第一类油气藏发育在逆掩带,鼻凸带构造定型早、晚期活动弱,是勘探突破的重点领域;第二类油气藏主要位于逆掩带北部,是高效勘探的重点领域;上盘紧邻源灶中心、源-储时空配置好的正向大构造是寻找第三类油气藏的重要领域。该研究成果将有效指导阜康断裂带下一步的勘探部署,推动博格达山前大油气区的勘探进程。
The Fukang fault zone,situated within the foreland thrust belt of the Junggar basin,is characterized by complex structures and significant exploration challenges.Early exploration achieved only sporadic breakthroughs in Jurassic-Triassic strata at the frontal part of the central segment.However,the subsequent discovery of a 100-million-ton tight sandstone oil reservoir in the Permian strata of the eastern segment confirmed the zone's multi-layer hydrocarbon potential and established its solid exploration prospects.Using integrated data from outcrops,drilling,logging,seismic surveys,organic geochemistry,cast thin sections,and fluid inclusion analysis,this study systematically evaluates Permian hydrocarbon accumulation conditions in the Fukang fault zone.Results indicate:①The Permian interval contains highquality source rocks,mainly within the Middle Permian Lucaogou Formation,characterized by substantial thickness and high organic matter content.These source rocks exhibit high thermal maturity within the foreland belt,establishing them as the main hydrocarbon source in the area.②Three clastic reservoir intervals(the Upper Wutonggou,Lower Jingjingzigou,and Ulapo formations)developed adjacent to the Lucaogou source rocks.These reservoirs are vertically stacked and laterally interconnected.③Controlled by two detachment layers(the Lucaogou Formation and Jurassic coal measures),the Fukang fault zone comprises three north-south-trending structural belts defined by the Yaomoshan,Fukang,and Wuliangshan faults.Laterally,the zone is subdivided into the Gumudi,Santai,and Jinan segments from west to east.Due to the differential tectonic stress within the Fukang thrust nappe,the deformation zone exhibits a geometry that is wider in the eastern and western sectors and narrower in the central segment.④Three hydrocarbon accumulation models are recognized in the Fukang fault zone.The first is early deep burial with multi-stage uplift and hybrid charging.Reservoirs of this type occur in the overthrust belt,where early-formed nasal convex structures have experienced weak late-stage activity,making them key targets for exploration breakthroughs.The second is the continuous burial model,whose reservoirs are mainly located in the northern part of the overthrust belt and represent focal points for high-efficiency exploration.The third is early deep burial with late uplift.Large positive structures in the upper plate,adjacent to the source kitchen center with excellent source-reservoir spatiotemporal configuration,are crucial areas for searching for natural gas reservoirs of this type.These insights provide a clear guide for the next phase of exploration deployment in the Fukang fault zone and are expected to advance the exploration process in the large hydrocarbon province fronting the Bogda Mountains.
作者
陈旋
徐雄飞
张亦婷
苟红光
何昌松
林潼
龚德瑜
程祎
余蔓琳
CHEN Xuan;XU Xiongfei;ZHANG Yiting;GOU Hongguang;HE Changsong;LIN Tong;GONG Deyu;CHENG Yi;YU Manlin(Research Institute of Exploration and Development,CNPC Tuha Oilfield Company,Hami,Xinjiang 839009,China;College of Geosciences,China University of Petroleum,Beijing 102249,China;National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)
出处
《地质学报》
北大核心
2025年第12期4313-4329,共17页
Acta Geologica Sinica
基金
新型油气勘探开发国家科技重大专项(编号2025ZD1400306,2025ZD1400305)资助的成果。
关键词
二叠系
成藏系统
勘探潜力
阜康断裂带
准噶尔盆地
Permian
reservoir system
exploration potential
Fukang fault zone
Junggar basin
