南海北部北部湾盆地油气藏形成条件  

Hydrocarbon accumulation conditions in Beibu-gulf Basin, northern South China Sea

作　　者：杨希冰 

机构地区：[1]中海石油(中国)有限公司湛江分公司

出　　处：《中国石油勘探》2016年第4期85-92,共8页China Petroleum Exploration

基　　金：国家科技重大专项"南海西部海域大中型油气田地质特征"(2011ZX05023-006-004)

摘　　要：位于南海北部大陆边缘的北部湾盆地以拉张裂陷为主,形成了具有典型断坳双层结构的断陷裂谷盆地,并控制了盆地内"先陆后海"型沉积充填序列。盆地内新生界油藏具有大面积生成、分布、富集并连片成藏的特点,又在不同层位和空间上聚散不一,呈现出复杂的变化格局。通过对北部湾盆地构造、沉积、成藏条件的系统分析和勘探开发实践的思考总结,认为富生烃凹陷决定了大中型油气藏的存在,富生烃凹陷内的大型沉积相带与有利构造单元的空间匹配,控制了大中型油气藏的分布。"先断后坳"、"先陆后海"的构造—沉积演化过程是大中型油气藏形成的根本因素。The Beibu-gulf Basin in the northern continental margin of South China Sea is dominated by extensional rifts, which facilitated the formation of depression-rift basin with typical double-layer （rift-depression） structure and controlled the sedimentary sequence of ＂marine sediment after continental sediment＂ in this basin. The Cenozoic reservoirs in this basin were generated, distributed, enriched and contiguously acctmmlated in large scales, and present a complex framework with diverse horizontal and spatial distributions. In this paper, the structural, sedimenl^-y and hydrocarbon accumulation conditions in the Beibu-gulf Basin were systematically analyzed, and the exploration and development practices were also reviewed. It is concluded that the existence of large-medium reservoirs is controlled by the hydrocarbon- rich sags, and the distribution of such reservoirs is controlled by the spatial matching between large sedimentary facies belts and favorable tectonic units in the hydrocarbon-rich sags. The tectonic-sedimentary evolution process of ＂depression after rifting＂ and ＂marine sediment after continental sediment＂ is essential for the formation of large-medium reservoirs.

关 键 词：南海北部 北部湾盆地 成藏条件 大中型油气藏 油气分布 

分 类 号：TE112.3[石油与天然气工程—油气勘探]