石油勘探与开发2018，Vol.45Issue(1)：27-39,13.DOI:10.11698/PED.2018.01.03
陆缘地壳强烈拆离薄化作用下的油气地质特征——以南海北部陆缘深水区白云凹陷为例
Petroleum geology controlled by extensive detachment thinning of continental margin crust: A case study of Baiyun sag in the deep-water area of northern South China Sea
摘要
Abstract
The relationships between crustal stretching and thinning,basin structure and petroleum geology in Baiyun deep-water area were analyzed using large area 3D seismic,gravity,magnetic,ocean bottom seismic (OBS),deep-water exploration wells and integrated ocean drilling program (IODP).During the early syn-rifting period,deep-water area was a half-graben controlled by high angle faults influenced by the brittle extension of upper crust.In the mid syn-rifting period,this area was a broad-deep fault depression controlled by detachment faults undergone brittle-ductile deformation and differentiated extension in the crust.In the late syn-rifting period,this area experienced fault-sag transition due to saucer-shaped rheology change dominated by crustal ductile deformation.A broad-deep fault depression controlled by the large detachment faults penetrating through the crust is an important feature of deep-water basin.The study suggests that the broad-deep Baiyun sag provides great accommodation space for the development of massive deltaic-lacustrine deposition system and hydrocarbon source rocks.The differentiated lithospheric thinning also resulted in the different thermal subsidence during post-rifting period,and then controlled the development of continental shelf break and deep-water reservoir sedimentary environment.The high heat flow background caused by the strong thinning of lithosphere and the rise of mantle source resulted in particularities in the reservoir diagenesis,hydrocarbon generation process and accumulation of deep-water area in northern South China Sea.关键词
南海北部/珠江口盆地/白云凹陷/深水区/陆缘地壳/拆离断层/宽深断陷/陆架坡折带/油气地质Key words
northern South China Sea/Zhujiangkou Basin/Baiyun sag/deep-water area/continental margin crust/detachment fault/broad-deep fault depression/continental shelf break/petroleum geology分类
能源科技引用本文复制引用
庞雄,任建业,郑金云,刘军,于鹏,柳保军..陆缘地壳强烈拆离薄化作用下的油气地质特征——以南海北部陆缘深水区白云凹陷为例[J].石油勘探与开发,2018,45(1):27-39,13.基金项目
国家科技重大专项(2011ZX05025-003,2016ZX05026-003) （2011ZX05025-003,2016ZX05026-003）
国家自然科学基金重点项目(91128207) （91128207）
中海石油有限公司科技项目(YXKY-2012-SHENHAI-01) （YXKY-2012-SHENHAI-01）
