东北石油大学学报

2007, No.132(03) 8-11+18+152

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扶余油田扶余油层的浅水三角洲沉积特征及模式
Sedimentary characteristics and model of the Fuyu oil-bearing reservoir in Fuyu oil field

张庆国;鲍志东;郭雅君;孙继武;何莹;

摘要:

扶余油田扶余油层缺乏沉积、储层等基础地质的系统研究,通过岩心、测井等资料综合分析,研究了扶余油层沉积特征、沉积微相及沉积演化.结果表明:松辽盆地南部扶余油层沉积时期,基底稳定缓慢沉降,盆地地形平缓,在湖平面扩张及浅水背景下河流入湖形成浅水三角洲.三角洲平原分支河道通过填积和频繁的分叉改道,向湖泊中心方向长距离推进,在三角洲前缘的浅水区域发育了大量水下分支河道.分支河道与水下分支河道砂体相互切割、叠加,一般单体河道平均宽为200~600m,河道砂体平均厚为3~8m.浅水三角洲与传统三角洲模式最大不同之处,是平面上浅水三角洲平原与宽展的三角洲前缘间平缓相接,没有传统的三角洲三层结构.在较强水动力作用下及整体水进背景下,形成了枝状浅水三角洲沉积模式.沉积特征及沉积微相研究为剩余油寻找及进一步生产调整奠定了基础.

关键词: 扶余油层;浅水三角洲;沉积微相;沉积模式;分支河道;水下分支河道

Abstract: Fuyu oil-bearing reservoir of Fuyu oilfield lacks basic researches on sediment and reservoir. Sedimentary characteristics, sedimentary microfacies and sedimentary evolvement were studied with analysis of core and geophysics well-logging data, etc. At the period of deposition of Fuyu reservoir in the Southern Part of Songliao Basin, the bedrock sank uniformly and slowly, and the topography of the basin was very flat, thus led to the development of a shallow water delta at the shallow water setting and the lake surface broaden. The distributary channel advanced toward the center of the lake over a long distance through filling deposition and branching channel frequently, and developed obvious subaqueous distributary channel at wide shallow water delta front. The oil-bearing reservoir was developed by both channel sand body which had cut and folded each other. The big difference between the shallow water delta and traditional delta is the topography between the delta plain and delta front was flat, without three-folded structure. The sedimentary model of shallow water branched delta was developed under the influence of more strong fluviatile hydrodynamics. This study is an important foundation for research of residual oil and further oilfield production adjust.

Keywords: Fuyu oil-bearing reservoir; shallow water delta; sedimentary microfacies; sedimentary model; distributary channel; subaqueous distributary channel

基金项目: 国家“973”重点基础研究发展计划项目(2006CB202304);; 中国石油吉林油田重点科技攻关项目(PK06004)

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