石油与天然气地质2026，Vol.47Issue(2)：441-459,19.DOI:10.11743/ogg20260206
北部湾盆地海中凹陷北部陡坡带勘探重大突破及油气富集成藏主控因素
Major exploration breakthroughs and main controlling factors of hydrocarbon accumulation and enrichment in the northern steep slope zone of the Haizhong Sag,Beibuwan Basin
摘要
Abstract
Despite over 40 years of hydrocarbon exploration in the Haizhong Sag of the Beibuwan Basin,no substantial breakthroughs had been achieved until the successful drilling of two exploration wells:inclined well Hai 3 and well Hai 301.To determine the major factors controlling hydrocarbon accumulation and enrichment in the northern steep slope zone of the Haizhong sag(also referred to as the Haizhong steep slope zone),we thoroughly investigate the relationships of hydrocarbon accumulation and enrichment with source rocks,reservoirs,hydrocarbon transport,and overpressure using the latest available data.The results indicate that high-quality source rocks of deep lacustrine facies are widely developed in the Liushagang Formation,Haizhong Sag,with hydrocarbon resources estimated at 2.5×108 t of oil equivalent,demonstrating great potential for sustained exploration.Large-scale,high-quality beach-bar sandstone reservoirs occur within the Haizhong steep slope zone,where beach-bar sand bodies exhibit vertical superimposition and lateral contiguous distribution.Among these,beach-bar sandstone reservoirs with relatively coarse grains show low matrix content and strong dissolution and have undergone fracturing modification,thereby featuring medium porosity and medium-low permeability.The slope zone contains an efficient three-dimensional fault-fracture transport system consisting of the No.3 fault and its associated faults,as well as fractures.The major active period of these faults aligns with the peak hydrocarbon expulsion of source rocks,ensuring efficient hydrocarbon charging.The extensive development of high-quality source rocks provides a resource foundation for hydrocarbon accumulation in the Haizhong steep slope zone.Regarding the hydrocarbon enrichment in this zone,the occurrence of large-scale high-quality beach-bar sandstone reservoirs serves as a prerequisite,while the presence of an efficient overpressured fault-fracture transport system is identified as a key factor.Additionally,hydrocarbon charging under strong driving forces in an overpressure environment creates favorable conditions for hydrocarbon accumulation and enrichment.关键词
滩坝沉积/断层输导/超压成藏/富集成藏因素/资源潜力/海中凹陷/北部湾盆地Key words
beach dam deposition/fault conduction/overpressure accumulation/accumulation enrichment factors/resource potential/Haizhong sag/Beibuwan Basin分类
能源科技引用本文复制引用
张尚虎,杨鹏程,江东辉,黄建军,周兴海,黄苏卫,张百涛,程雪彤,余永琪..北部湾盆地海中凹陷北部陡坡带勘探重大突破及油气富集成藏主控因素[J].石油与天然气地质,2026,47(2):441-459,19.基金项目
中国石化集团公司科技项目(P25121,P23245). （P25121,P23245）
