摘要
海拉尔盆地贝尔断陷面积3010 km2,由下到上主要发育4套含油组合。其中,布达特群变质岩具有储层厚度大、产能高(多口井日产30 t以上)的特点。其主要由一套碎裂安山凝灰岩、蚀变火山岩、轻微蚀变碎裂不等粒砂岩、坍塌角砾岩、含粉砂碎裂凝灰质泥岩等组成。地层倾角较大,溶洞发育,裂隙纵横交错,部分被硅质、碳酸盐所交代。储集空间主要为次生裂缝和各种溶蚀孔隙,其次为基质孔隙。纵向上可分为风化破碎发育带,裂缝、溶孔、溶洞发育带和致密带。这种特殊储层需要针对性的勘探方法和技术。通过勘探实践认为:叠前时间偏移处理与精细三维地震解释是识别变质岩顶面形态变化的基础,开展以裂缝预测为主要目的的反演处理与解释,是井位部署的依据之一,取好岩心和成像测井资料是识别变质岩储层裂缝和溶孔、溶洞的关键,合理的压裂工艺是获得高产油流的主要手段。
Beier Rift of Halaer Basin has an area of 3010 km^2, including 4 sets of oil-bearing combination from lower to upper part. Among them, metamorphic rock of Budate Group has characteristics of large thickness of reservoirs and high productivity （several wells have daily production more than 30 t）. This area consists of cataclastic andesitic tuff, altered volcanic rock, slightly altered and cataclastic anisomerous sandstone, slump breccia, and silt bearing eataclastic tuffaceous shale. Formation dip is large, caverns develop much, fractures crisscross each other, part with metasomatism of kiesel and carbonate. Reservoir space is mainly secondary fractures and all types of corroded pores, and secondarily matrix pores. This area is vertically divided into detrition development zone, fractures, corroded pores and caverns develop- ment zone and tight zone. This kind of special reservoir needs concrete exploration techniques. Practice shows that pre - stack time migration processing and 3D seismic interpretation are basis for identifying top form variation of metamorphic rock. Performing inversion processing and interpretation aiming at fracture prediction is one of important evidence for well arrangement. Obtaining correct core data and imaging logging data is key point of identifying fractures, corroded pores and caverns in metamorphic rock reservoirs. Reasonable fracturing technique is mainly method for getting high oil production.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2007年第2期23-26,30,共5页
Petroleum Geology & Oilfield Development in Daqing
关键词
油气形成
变质岩储层
储集空间
勘探方法
贝尔断陷
oil and gas formation
metamorphic rock reservoir
reservoir space
exploration method
Beier Rift
