长春油田C区块双二段沉积体系特征与有利相带分析

发布时间：2018-05-28 01:27

本文选题：长春油田 + 扇三角洲　；参考：《吉林大学》2017年硕士论文

【摘要】：长春油田C区块位于伊通盆地鹿乡断陷五星构造带,受2号和17号断裂控制。构造形态为向南西倾的单斜构造,目的层是古近系双阳组,埋深1800-1900 m。储层的沉积体系为扇三角洲,具有高孔渗、高孔喉比的特征,储层非均质性严重。本论文的主要内容包括以下三个方面:一、岩石类型与沉积相类型钻井揭示长春油田C区块双二段有四种主要岩石类型为砾岩、砂岩、粉砂岩、泥岩。识别出扇三角洲前缘亚相与扇三角洲平原亚相。通过岩心资料建立岩性模式,并针对仅有电性资料的井建立电性模式,完善C区块的岩性及岩相研究。二、以单砂体为单位的沉积体系分析对C区块双二段5个砂组四十多个单砂体逐一进行沉积体系分析,综合分析其物源入口、物源流向、以及形成砂体粒级,砂体成因等问题。分析结果显示C区块扇三角洲沉积体系的主要特征为东部物源近距离搬运,河道由东向西延伸并常发生河道改道或叠置。三、有利沉积相带分析通过将该区物性与含油性结合,并对数据整理统计,得出该区孔隙度普遍较大,从渗透率将单砂体分为三等,最好的层位在扇三角洲平原和扇三角洲前缘都有,有利相带为平原河道(砂质河道与废弃河道,砾质河道稍逊)和前缘河口坝,部分天然堤,水下河道亦有较好含油性。
[Abstract]:Block C of Changchun Oilfield is located in Wuxing structural belt of Luxiang fault depression in Yitong Basin, controlled by 2 and 17 faults. The structure is a monoclinal structure with a southwestward dip, and the target layer is the Shuangyang formation of Paleogene, with a buried depth of 1800-1900 m. The sedimentary system of the reservoir is fan delta with the characteristics of high porosity and high pore-throat ratio, and the reservoir heterogeneity is serious. The main contents of this paper include the following three aspects: first, the drilling of rock type and sedimentary facies type reveals that there are four main rock types in double member of C block in Changchun Oilfield: conglomerate, sandstone, siltstone and mudstone. The front subfacies of fan delta and the subfacies of plain of fan delta are identified. The lithologic model is established through core data and electric model is established for wells with only electrical data to perfect the lithology and lithofacies study of block C. Secondly, the sedimentary system analysis of more than 40 single sand bodies of 5 sand formations in double second stage in C block is carried out, and its material source inlet, material flow direction, grain size of sand body and origin of sand body are analyzed synthetically. The results show that the main characteristics of fan delta sedimentary system in block C are the close transport of the eastern provenance, the extension of the channel from east to west, and the channel diversion or overlay. Third, the favorable sedimentary facies zone analysis, by combining the physical properties and oil content of the area, and sorting out the data, it is concluded that the porosity in this area is generally larger, and the single sand body is divided into three classes from the permeability. The best layers are in the fan delta plain and the front edge of the fan delta. The favorable facies zones are plain channel (sandy channel and abandoned channel, gravelly channel slightly inferior) and front edge estuary dam. Some natural dikes and underwater channel also have good oil content.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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