海-塔盆地中部断陷带南屯组沉积体系配置及有利相带分析  

Study on the Sedimentary System and Favorable Facies of Nantun Formation in the middle Zone of Hailaer-Tamtsag Basin

作　　者：黄薇[1] 吴海波[1] 李军辉[1] 刘赫[1] 

机构地区：[1]大庆油田有限责仟公司勘探开发研究院,黑龙江大庆163712

出　　处：《沉积学报》2016年第1期120-128,共9页Acta Sedimentologica Sinica

基　　金：国家重点基础研究发展计划(973计划)(2006CB701403)~~

摘　　要：本文充分利用岩芯、测井、地震及分析化验等资料,对海—塔盆地中部断陷带4个主力凹陷的南屯组砂体类型及分布特征进行了详细研究。结果表明,南屯组主要发育扇三角洲、近岸水下扇、辫状河三角洲和湖底扇等4种典型类型砂体,并从沉积背景、发育部位、沉积特征、搬运机制以及地震反射特征等5个方面,分不同角度、不同层次详细阐述了扇三角洲、近岸水下扇、辫状河三角洲和湖底扇的识别标志;其中扇三角洲主要分布在乌尔逊凹陷和贝尔凹陷的陡坡带,近岸水下扇主要分布在南贝尔凹陷和塔南凹陷的陡坡带,而辫状河三角洲主要分布乌尔逊凹陷、贝尔凹陷和南贝尔凹陷的缓坡带。从盆地边部向盆地中心方向,沉积相由扇三角洲、近岸水下扇和辫状河三角洲沉积逐渐过渡为半深湖—深湖相沉积,局部半深湖—深湖相中发育湖底扇沉积体系,整体具有"南北分块、东西分带"的沉积格局。综合研究表明,扇三角洲前缘、近岸水下扇中扇和辫状河三角洲前缘砂体是油气富集的有利沉积相带,而洼槽边缘的湖底扇砂体为岩性油气藏勘探的重点对象。Based on the core,well log curvies,seismic,sample testing data as well as the basic theory of sedimentology,the distribution law of the Nantun Formation in four mainly depressions in the middle fault zone of Hailaer-Tamt sag is studied. The results show that Nantun Formation developed fan delta,nearshore subaqueous fans,braided river delta and sublacustrine fan,their sedimentary characteristics and identification mark are analysed form depositional setting,development position,sedimentary characteristics,transport mechanism and seismic reflection characteristic.Fan delta mainly developed in the steep slope zone of Wuerxun and Beier sags,nearshore subaqueous fans mainly developed in the steep slope zone of tanan and nanbeier sags.,braided river delta mainly developed in the gentle slope of Wuerxun,Beier and nanbeier sags. Form the edge to the center of the basin,sedimentary facies change form fan delta to nearshore subaqueous fans then to half deep lake-deep subfacies,Sublacustrine fan developed in some part of the half deep-deep lake area,with the whole deposition pattern of ＂ north and south block,east and west belts＂. Fan delta front subfacies,braided river delta front subfacies and middle fan of nearshore subaqueous fans are the important hydrocarbon accumulation zones. Sublacustrine fan is favorable objects of lithologic reservoir exploration.

关 键 词：海—塔盆地 南屯组 扇三角洲 近岸水下扇 辫状河三角洲 湖底扇 识别标志 分布特征 

分 类 号：TE122.2[石油与天然气工程—油气勘探]