摘要
利用岩心观察、测井相分析、测井解释与评价、图像分析等方法,系统研究了胜坨油田坨123断块古近系沙四段近岸水下扇的沉积特征及储层非均质性。结果表明,坨123断块近岸水下扇岩性以砾状砂岩为主,兼具重力流和牵引流沉积特征,可细分为扇中主体、扇中侧缘、扇中前缘、扇端、湖相泥和滑塌浊积砂6种微相类型。研究区储层非均质性较强,扇中主体和扇中前缘具有不同的层内非均质特征,分别以韵律性不明显、渗透率差异大为主要特征;层间及平面非均质性主要受沉积微相控制,扇中前缘储层的物性、含油性要好于扇中主体储层;不同沉积相带储层微观孔隙结构存在差异,扇中前缘主要发育中孔中喉和细孔中喉型孔隙结构,扇中主体主要发育细孔细喉型孔隙结构,扇体边缘主要发育微孔型孔隙结构。
Depositional characteristics and reservoir heterogeneity of thenearshore subaqueous fans in the 4^(th) member of the Shahejie formation in T123 block of Shengtuo oilfield have been studied systematically based on the core observation,electrofacies analysis,well log interpretation and image analysis.The study shows that the lithological composition of the nearshore subaqueous fans is mainly composed of pebbly sandstone,whose grain size characteristics indicate both the density current and traction current feature.The reservoir of the nearshore subaqueous fans in T123 block of Shengtuo oilfield is formed by multiple phase,within which each phase fan can be divided into six types of microfacies,including main body of middle fan,front of middle fan,lateral margin of middle fan,turbidite sand body,outer fan and lacustrine argillutite.The reservoir heterogeneity of the nearshore subaqueous fans is very significant and the inlayer heterogeneity can be characterized by main body pattern and front pattern,whose common attribution is the indistinct rhythmicity and high permeability contrast.The interlayer heterogeneity and areal heterogeneity are controlled by the sedimentary microfacies,and the physical properties and hydrocarbon saturation of sandbodies in front of middle fan are better than those in main body of middle fan.The microscopic pore-throat structure in these microfacies is also different.The moderate pore-throat and minute pore-moderate throat occur typically in the front of middle fan,and the minute pore-throat exists in the main body of middle fan,the micro pore-throat are mainly developed in the marginal microfacies of the nearshore subaqueous fans.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第3期34-37,41,共5页
Petroleum Geology and Recovery Efficiency
基金
中国石化集团公司十条龙项目"胜利油区主力油田注水开发关键技术研究"(P06078)
关键词
近岸水下扇
沉积特征
沉积微相
非均质性
胜坨油田
nearshore subaqueous fans
depositional characteristics
sedimentary microfacies
reservoir heterogeneity
Shengtuo oilfield
作者简介
高建刚，男，高级工程师，在读博士研究生，从事油田开发研究和管理工作，联系电话：（0546）8501016，E-mail：scgig@Mof．com。
