珠江口盆地白云深水区渐新世—中新世陆架坡折带演化及油气勘探意义

doi:10.7623/syxb201102007

石油学报 ›› 2011, Vol. 32 ›› Issue (2): 234-242.DOI: 10.7623/syxb201102007

珠江口盆地白云深水区渐新世—中新世陆架坡折带演化及油气勘探意义

柳保军庞雄颜承志刘军连世勇何敏申俊

中海石油（中国）有限公司深圳分公司广东广州 510240

收稿日期:2010-07-23 修回日期:2010-11-20 出版日期:2011-03-25 发布日期:2011-05-25
通讯作者: 柳保军
作者简介:柳保军，男，1978年11月生，2004年获中国地质大学（武汉）硕士学位，现为中海石油（中国）有限公司深圳分公司研究院工程师，主要从事珠江口盆地石油勘探研究。
基金资助:
国家自然科学基金重点项目(No.40238060)、国家科技重大专项（2008ZX05025-03和2008ZX05056-01）联合资助。

Evolution of the Oligocene-Miocene shelf slope-break zone in the Baiyun deep-water area of the Pearl River Mouth Basin and its significance in oil-gas exploration

LIU Baojun PANG Xiong YAN Chengzhi LIU Jun LIAN Shiyong HE Min SHEN Jun

Received:2010-07-23 Revised:2010-11-20 Online:2011-03-25 Published:2011-05-25

摘要/Abstract

摘要：

多年的勘探实践和全区系统的层序地层研究证实，渐新世与中新世的界面为珠江口盆地的重大沉积—构造转换面，对应着南海扩张脊的跳跃和偏转、古珠江物源突变等白云运动重大事件（距今23.8 Ma左右）。该事件导致白云深水区陆架坡折带由晚渐新世位于南部隆起带附近向中新世的白云凹陷北坡迁移，其位置从距今21 Ma以来基本维持不变。两种类型和位置不同的陆架坡折带控制了渐新世和中新世白云凹陷两种不同层序组合的发育：①距今23.8 Ma之前的沉积陆架坡折带呈NNE向展布，由NW向SE方向迁移，发育了珠海组海退进积型层序组合；②距今21.0 Ma以来的陆架坡折带相对稳定地维持在白云凹陷北坡一带，走向为NE，发育珠江组—韩江组海侵加积型层序组合。陆架坡折带控制了白云深水区各层序中相对富砂的浅水三角洲沉积体、低位陆架边缘三角洲沉积体及陆坡区珠江深水扇砂体等有利储集层和成藏带的发育。SQ23.8和SQ21.0两个三级层序为白云运动的沉积响应，具有最为富砂背景的低位深水扇发育条件。通过综合研究，基本明确了渐新世的滨岸-三角洲-深水扇沉积体系及新近纪的深水沉积储盖组合为白云深水区的主要勘探层系。白云深水区天然气藏及番禺天然气区的形成均受控于这两个陆架坡折带，表明南海北部白云深水区具有巨大的油气勘探潜力。

关键词: 南海北部, 白云深水区, 陆架坡折带, 陆架边缘三角洲, 层序地层格架, 深水扇

Abstract:

The exploration practice and integrated sequence-stratigraphic studies for years demonstrated that the Oligocene-Miocene boundary was an important transfer interface of sedimentary-tectonic-climate conditions in the Pearl River Mouth Basin and corresponded to the Baiyun movement(in about 23.8 Ma), during which the seafloor spreading ridge of the South China Sea jumped, was deflected and accompanied with material source changes of the paleo-Pearl River. This event resulted in the shift of the shelf slope-break zone from the neighborhood of the southern uplift area of the Baiyun Depression in late Oligocene to the northern slope in Miocene. Moreover, the shelf slope-break zone has basically stood there since about 21 Ma. In Oligocene-Miocene, two shelf slope-break zones with different development types and locations controlled the development of the two different sequence units in the Baiyun Depression, i.e. a depositional shelf slope-break zone extending in NNE orientation shifted from NW to SE until 23.8 Ma and developed a regressive progradation sequence unit in the Zhuhai Formation, and subsequently, another shelf slope-break zone with NE strike has stood steadily around the north slope of the Baiyun Depression since 21 Ma and formed a transgressive aggradation sequence unit. Moreover, the migration of shelf slope-break zones also controlled the development of prospective reservoirs and hydrocarbon accumulation belts(including shallow marine delta with relatively
abundant sand, lowstand shelf-edge delta and deepwater fan sandstones in the continental slope of the Pearl River) within various sequences of the Baiyun deepwater area. It was confirmed that both SQ23.8 and SQ21.0 third-grade sequences were the product of sedimentation corresponding to the Baiyun Movement, and they were of conditions to develop lowstand deepwater fans with most abundant sand in the Baiyun deepwater area. Integrated investigations basically demonstrated that reservoir-seal assemblages of the Oligocene Pearl River coast-delta-deepwater fan depositional system and Neogene deepwater deposits were major objective strata for further exploration. Up to now, natural gas discoveries in the Baiyun deepwater area and Panyu gas province have confirmed the control effect of the shelf slope-break zones on gas reservoirs, indicating a great potential of petroleum exploration in the Baiyun deep-water slope area of the northern South China Sea.

Key words: northern South China Sea, Baiyun deep-water area, continental shelf slope-break zone, shelf-edge delta, sequence stratigraphic
framework; , deep-water fan

柳保军庞雄颜承志刘军连世勇何敏申俊. 珠江口盆地白云深水区渐新世—中新世陆架坡折带演化及油气勘探意义[J]. 石油学报, 2011, 32(2): 234-242.

LIU Baojun PANG Xiong YAN Chengzhi LIU Jun LIAN Shiyong HE Min SHEN Jun. Evolution of the Oligocene-Miocene shelf slope-break zone in the Baiyun deep-water area of the Pearl River Mouth Basin and its significance in oil-gas exploration[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(2): 234-242.

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珠江口盆地白云深水区渐新世—中新世陆架坡折带演化及油气勘探意义

Evolution of the Oligocene-Miocene shelf slope-break zone in the Baiyun deep-water area of the Pearl River Mouth Basin and its significance in oil-gas exploration

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