CAJ | 학술논문

南海北部边缘盆地发育三套主力烃源岩，包括断陷期湖相和海陆过渡相烃源岩，以及坳陷期海相烃源岩。储层发育“三套两类”，即陆相砂岩、海陆过渡相砂岩以及海相砂岩和碳酸盐岩。断陷期湖相泥岩为较好局部盖层，中新世以来广泛沉积的海相泥岩是良好的区域盖层。圈闭丰富，其类型主要有构造、地层和复合圈闭。南海北部边缘盆地表现出油气共生、阶梯状输导、环洼聚集、断裂控藏的油气成藏特征。分析认为，烃源岩和热场共同控制着南海北部边缘盆地的油气分布；输导体系是油气运移的必经通道，并决定着油气藏层位的分布；此外，环洼分布的构造带是油气运聚的有利指向区。
남해북부변연분지발육삼투주력경원암，포괄단함기호상화해륙과도상경원암，이급요함기해상경원암。저층발육“삼투량류”，즉륙상사암、해륙과도상사암이급해상사암화탄산염암。단함기호상니암위교호국부개층，중신세이래엄범침적적해상니암시량호적구역개층。권폐봉부，기류형주요유구조、지층화복합권폐。남해북부변연분지표현출유기공생、계제상수도、배와취집、단렬공장적유기성장특정。분석인위，경원암화열장공동공제착남해북부변연분지적유기분포；수도체계시유기운이적필경통도，병결정착유기장층위적분포；차외，배와분포적구조대시유기운취적유리지향구。
In the marginal basins of the northern South China Sea, 3 sets of main source rocks developed, inclu-ding lacustrine and transitional source rocks in the rifting period and marine source rocks in the depression stage. There are 3 sets and 2 types of reservoirs, namely continental sandstones, transitional sandstones, marine sand-stones and carbonate rocks. The lacustrine mudstone in the rifting sequence is favorable local seal and the wide-spread marine mudstone ever since Miocene is good regional cap rock. There are abundant traps with the main styles of structural, stratigraphic and compound ones. Hydrocarbon accumulation in the study area is featured by oil and gas coexistence, step-like migration, accumulation around sags, and fault’ s control over hydrocarbon reservoir. Oil and gas distribution in the marginal basins of the northern South China Sea is controlled by source rocks and geothermal heat flows. The transportation system, which is an essential pathway for hydrocarbon migration, also determines the distribution of oil and gas reservoir layers. Besides, structural belts around sags are always the favorable areas for hydrocarbon migration and accumulation.