CAJ | 학술논문

探讨南美 Llanos 盆地油气地质特征及成藏规律。在前人研究的基础上，通过对构造沉积演化、生-储-盖条件、圈闭特征、油气田分布等分析，总结了 Llanos 盆地油气运聚特征及富集规律，指出有利勘探方向。结果表明，Llanos 盆地是中生代弧后裂谷与新生代前陆作用共同形成的叠合盆地，主力烃源岩为白垩系 Gacheta 组页岩，储层包括白垩系、古近系及新近系多套砂岩，已证实有油气的储盖组合有7套；该盆地油气运聚具有远距运移混源充注、断砂立体持续输导、近远灶阶梯式捕集成藏的特点，近灶优先捕集形成中深层、大中型构造油气田，远灶接替捕集形成浅层、小型复合型油气田。盆地西部发育逆掩推覆构造圈闭，数量少、规模大，可形成大型油气田，是构造圈闭的有利勘探目标区；盆地中部和东部主要发育岩性-构造圈闭、岩性圈闭及水动力圈闭，圈闭类型和数量多但规模小，可形成浅层小型油气田，是地层-构造、水动力-构造等复合圈闭的主要勘探目标区。
탐토남미 Llanos 분지유기지질특정급성장규률。재전인연구적기출상，통과대구조침적연화、생-저-개조건、권폐특정、유기전분포등분석，총결료 Llanos 분지유기운취특정급부집규률，지출유리감탐방향。결과표명，Llanos 분지시중생대호후렬곡여신생대전륙작용공동형성적첩합분지，주력경원암위백성계 Gacheta 조혈암，저층포괄백성계、고근계급신근계다투사암，이증실유유기적저개조합유7투；해분지유기운취구유원거운이혼원충주、단사입체지속수도、근원조계제식포집성장적특점，근조우선포집형성중심층、대중형구조유기전，원조접체포집형성천층、소형복합형유기전。분지서부발육역엄추복구조권폐，수량소、규모대，가형성대형유기전，시구조권폐적유리감탐목표구；분지중부화동부주요발육암성-구조권폐、암성권폐급수동력권폐，권폐류형화수량다단규모소，가형성천층소형유기전，시지층-구조、수동력-구조등복합권폐적주요감탐목표구。
Based on the tectonic and sedimentary evolution, hydrocarbon plays condition, trap characteristics and oil fields distribution,etc.,the paper illustrates the geological features and hydrocarbon accumulation patterns in Llanos Basin,South America,and points out the exploration prospect areas.Llanos Basin is a composite basin after the Mesozoic back-arc rift and the Cenozoic foreland basining.The main source rock is the Cretaceous Gacheta shale.Several sets of reservoir rocks develop in Cretaceous, Paleogene and Neogene sandstones and seven reservoir-cap sets containing oil and gas are confirmed.The hydrocarbon migration and accumulation features are the long distance migration,the mixed-source charge,continuous the three-dimensional transporting of breaking sands,and the stepped catching integrated reservoirs of near and far hydrocarbon stoves. The traps close to the hydrocarbon stove have the priority of trapping to form medium-large structures fields in the medium deep formations.The traps far from the hydrocarbon stove succeed trapping and form small complex structures fields in shallow formations. A few but large scale overthrust structural traps develop in the west of the basin.They can form large fields.This area is a target area for exploring structural traps.In the center and the east of the basin,there develop lithologic-structural traps,lithologic traps and hydrodynamic traps.The traps have a high number and multiple types but small scales.They can only form small shallow oil and gas fields and become a target area for combination traps exploration.