摘要
英东油田位于柴达木盆地英雄岭构造带东段,地面地形异常复杂,以往认为地质条件不利于油气成藏,始终未获重大发现。近年来随着山地三维地震及测井评价技术的不断提高,在2010年获得重大突破,探明了柴达木盆地单个油藏储量规模最大、丰度最高、物性最好、开发效益最佳的整装油气田,并建成产能50×104t。通过对英东油田的精细解剖,对成藏特征及技术难题进行了研究攻关,形成以下认识:英雄岭地区具有晚期生烃、持续充注的特点;新近系湖相砂体分布广泛,储-盖组合配置好;该区断层具备良好的侧向封堵性能,在中浅层易于形成断块圈闭;英东地区大型滑脱断层沟通始新统优质烃源岩,使早期聚集的油气藏发生调整,同时后期形成的油气持续运聚,深、浅断裂形成"接力式"输导,在浅层晚期形成的构造圈闭聚集成藏,具有晚期复式成藏的特征。针对英东地区复杂的地形地貌和油藏特征,形成了复杂山地三维地震采集处理解释一体化技术,为落实油气勘探目标奠定基础。针对英东油田含油气井段长、流体识别难度大等问题,建立了长井段多油气水系统油藏开发模式、多条件约束复杂断块地质建模技术。通过研究,明确了英东油田的成藏机理,攻克了工程复杂关键技术,为实现英东油田的高效开发和快速上产提供了地质理论和技术保障。
Yingdong oilfield is located in the eastern part of Yingxiongling tectonic belt,Qaidam Basin,characterized by very complex surface topography,which was previously considered to have no favorable geological conditions for hydrocarbon accumulation,so that there has been no major discovery.With continuous improvement in3 D mountain seismic technology and logging evaluation during recent years,agreat breakthrough was achieved in 2010,proving that Qaidam Basin is a single monolithic oil and gas field with the largest reservoir reserves,the highest abundance,the best physical properties and development benefit,and the production capacity of 50 million tons.In this study,Yingdong oilfield was precisely analyzed to investigate the reservoir formation characteristics and technological problems,so as to obtain the following understandings.Yingxiongling area is characterized by late hydrocarbon generation and continuous charging,where Neogene lacustrine facies sand bodies are widely distributed with good reservoir-cap assemblage;the faults have favorable lateral sealing performance,easy to form fault block traps in mid-shallow layers.In Yingdong area,Eocene high-quality source rocks are connected by large detachment faults,resulting in the adjustment of early accumulated hydrocarbon reservoirs and the late continuous hydrocarbon migration and accumulation.The shallow and deep faults were combined to form the relay transport mode,thus leading to hydrocarbon accumulation in the tectonic traps of shallow layers during the late period,characterized by the late compound reservoir accumulation.Aiming at the complicated topography and reservoir characteristics of Yingdong area,the integrated technology of complex 3D mountainous seismic acquisition,processing and interpretation was created to lay the foundation for the implementation of oil and gas exploration target.To solve the problems such as long oil-bearing gas well member and difficult fluid identification in Yingdong oilfield,the long-well-member oil-gas-water reservoir multiple development mode was established as well as the multi-constraint complex fault-block geological modeling technology.Through this study,the reservoir accumulation mechanism of Yingdong oilfield was identified,and the complex key engineering technology was achieved,which provide geological theory and technical support for the efficient development and rapid production of Yingdong oilfield.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2016年第B11期11-21,共11页
Acta Petrolei Sinica
基金
中国石油天然气集团公司重大科技专项(2016E-01)资助
关键词
柴达木盆地
英东油田
晚期构造成藏模式
山地三维地震
断块油藏
高效开发
Qaidam Basin
Yingdong oilfield
late tectonic accumulation model
3D mountain seismic
fault block reservoir
efficient development
