海上浅层大气田——DF1—1气田
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摘要
ＤＦ１—１气田位于莺歌海盆地泥底辟构造带北部，是一个由泥底辟而形成的继承性背斜构造，即整装的浅层大气田。气田的储层物性好，产能高，是在半深海背景在波浪和海流作用下而形成的滨外滩坝沉积。气田主体部位西区Ⅱ气组气层天然气低含ＣＯ２，高含Ｎ２和ＣＨ４气体，属干气藏，驱动类型以弹性弱边水驱动为主。气田在勘探评价过程中，使用了高分辨率地震等一系列新技术和新方法，即高分辨地震技术、相对波阻抗技术、低阻气层识别技术、储层包裹体分析技术和压汞、测井分析技术，实现了海上稀井广探，达到了提高效率和经济效益的目的。
DF1—1 gas field is located in the north of the mud diapir structure belt in Yinggehai Basin,being a successive anticlinal structure formed by mud diapiric activity,i.e.an integral shallow giant gas field.The petrophysical property of the reservoir in the field is good with a high gas well productivity.It is an offshore beach and bar deposition formed by the action of the wave and ocean current in bathyal marine zone.The properties of the natural gas in Gas Formation Ⅱ at the west area of the prominent part of the field are low carbon dioxide content,high nitrogen content and high methane content.It is a dry gas reservoir and its driving type is mainly the elastic weak edge water drive.In the process of exploration evaluation of the field,a series of new techniques and methods were adopted,such as high resolution seismic survey,relative wave impedence,low resistance gas formation identification,reservoir inclusion analysis,mercury injection test and log analysis,etc.,so as to realize the demand of more extensive offshore exploration by drilling less wells and to achieve the purpose of raising working efficiency and economic benefit.
DF1—1 gas field is located in the north of the mud diapir structure belt in Yinggehai Basin,being a successive anticlinal structure formed by mud diapiric activity,i.e.an integral shallow giant gas field.The petrophysical property of the reservoir in the field is good with a high gas well productivity.It is an offshore beach and bar deposition formed by the action of the wave and ocean current in bathyal marine zone.The properties of the natural gas in Gas Formation Ⅱ at the west area of the prominent part of the field are low carbon dioxide content,high nitrogen content and high methane content.It is a dry gas reservoir and its driving type is mainly the elastic weak edge water drive.In the process of exploration evaluation of the field,a series of new techniques and methods were adopted,such as high resolution seismic survey,relative wave impedence,low resistance gas formation identification,reservoir inclusion analysis,mercury injection test and log analysis,etc.,so as to realize the demand of more extensive offshore exploration by drilling less wells and to achieve the purpose of raising working efficiency and economic benefit.
引文
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