摘要
南海北部陆缘白云凹陷深水区油气勘探逐步揭示超压发育,超压对中深层油气成藏影响的研究受到重视。基于最新钻井、地震和地质资料,分析了白云凹陷超压发育特征、形成控制因素及其对中深层油气成藏的影响。研究认为,超压主要发育于白云主洼珠海组及以下中深层地层中,超压分布呈现东北高、西南低特征;生烃增压和砂岩致密封闭是白云凹陷中深层超压产生的主要原因,构造演化与沉积中心控制超压平面分布;白云凹陷中深层超压提供了油气运移动力,促进断裂、底辟等油气运移通道的形成,并控制形成了白云凹陷深水区"双层"油气成藏系统;指出下组合地层超覆领域、古潜山领域以及高温超压"甜点"储层区是白云凹陷规模油气勘探的有利方向。
Oil&gas exploration in the deep water area of Baiyun sag in the northern continental margin of the South China Sea has gradually revealed the characteristics of overpressure development,and the research on overpressure affecting hydrocarbon accumulation in mid-deep strata has received more and more attentions.Based on the latest drilling,seismic and geological data,the development characteristics,formation controlling factors of overpressure in the Baiyun sag and their influences on mid-deep hydrocarbon accumulation have been analyzed.The researches revealed the following overpressure features:overpressure mainly developed in the Zhuhai Formation and the mid-deep strata below it in the major Baiyun sag,and its distribution can be characterized by high in the northeast and low in the southwest.Hydrocarbon generation pressurization and sandstone’s compacted sealing are the main causes of overpressure in the mid-deep strata of Baiyun sag,while structural evolution and depocenter control the planar distribution of overpressure.The overpressure in the mid-deep strata of Baiyun sag provides driving force for the migration of hydrocarbons,facilitates the formation of main geological pathways such as faults and diapirs,and controls the formation of"double-layer"hydrocarbon accumulation pattern in the deep water area of Baiyun sag.It is pointed out that the stratigraphic overlaps in the lower strata,buried hills and"sweet spot"reservoirs of high temperature and overpressure are the favorable directions for large-scale oil and gas exploration in the Baiyun sag.
作者
田立新
张忠涛
庞雄
吴哲
王卓超
何敏
陈红汉
舒梁峰
冯轩
TIAN Lixin;ZHANG Zhongtao;PANG Xiong;WU Zhe;WANG Zhuochao;HE Min;CHEN Honghan;SHU Liangfeng;FENG Xuan(CNOOC China Limited,Shenzhen Branch,Shenzhen,Guangdong 518054,China;CNOOC Deepwater Development Limited,Shenzhen,Guangdong 518054,China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan,Hubei 430074,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2020年第6期1-11,共11页
China Offshore Oil and Gas
基金
“十三五”国家科技重大专项“珠江口盆地陆缘深水区油气地质及勘探关键技术(编号:2016ZX05026-003)”部分研究成果。
关键词
白云凹陷
深水区
中深层
超压
成因机制
成藏模式
勘探方向
the Baiyun sag
deep water area
mid-deep strata
overpressure
genetic mechanism
hydrocarbon accumulation mode
exploration direction
