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松辽盆地北部中浅层石油地质条件、资源潜力及勘探方向

作    者:付 丽1,2, 梁江平1,2, 白雪峰1,2, 霍秋立1,2, 赵棣颖1,2
单    位:1大庆油田有限责任公司勘探开发研究院;2 黑龙江省致密油和泥岩油成藏研究重点实验室
基金项目:受中国石油集团重大专项之课题“大庆探区第四次油气资源评价”等资助
摘    要:
为了落实松辽盆地北部中浅层常规油与致密油的资源潜力,明确勘探方向,在系统总结烃源岩、储层等基本石油地质条件的基础上,分析了常规油与致密油成藏模式及主控因素,采用类比法和成因法计算了常规油与致密油资源量,研究了剩余资源分布特征,指出了下步勘探方向。松辽盆地晚白垩世发育青山口组和嫩江组2套分布广、厚度大、有机质丰度高、有机质类型好的优质烃源岩。中央坳陷区青山口组一段、二段烃源岩处于成熟阶段,生排烃能力强,是常规油和致密油的主力烃源岩。大型湖泊三角洲—河流沉积的各种砂体与烃源岩形成了良好的生储盖配置,构成了盆地的上、中、下3套含油气组合,其中致密油主要分布于中部含油组合的高台子油层和下部含油组合的扶余油层。常规油成藏主要具有下生上储、上生下储及异地生储3种模式,致密油成藏主要有自生自储和上生下储2种模式,有效烃源岩控制了常规油油藏和致密油油藏分布,沉积相带控制了常规油油藏类型,储层物性控制了致密油富集。在烃源岩精细评价的基础上,采用盆地模拟法计算的石油总资源量为102×108 t;通过系统解剖6个常规油和3个致密油区带刻度区,采用类比法精细评价的常规油资源量为88.7×108 t,致密油资源量为12.7×108 t。常规油中的葡萄花油层剩余资源潜力大,是近期勘探的主力层系,古龙、长垣和三肇等地区是主要的勘探有利区;长垣、三肇和齐家—古龙的扶余油层是致密油勘探的有利区。
关键词:地质条件;主控因素;成藏模式;资源潜力;勘探方向;石油;松辽盆地

The geological conditions, resource potential, and exploration direction of oil of middle-shallow layers in the northern Songliao Basin

Author's Name: FU Li, LIANG Jiangping, BAI Xuefeng, HUO Qiuli, ZHAO Diying
Institution: Exploration and Development Research Institute of Daqing Oilfield
Abstract:
In order to work out the resource potential of conventional oil and tight oil in northern Songliao Basin and guide the exploration direction, based on systematic summarization of petroleum geological conditions such as source rock, reservoir physical properties and so on, oil accumulation patterns and dominant control factors are analyzed. The resources of conventional oil and tight oil are evaluated by both analogy and genesis methods and the distributions of remaining oil resources are studied in order to guide the next exploration direction of oil. Two sets of excellent source rocks of the Qingshankou Formation and Nenjiang Fornation, developing in the Late Cretaceous, spread vastly in the Songliao Basin with large thickness, high organic content and oil-prone kerogen type. The source rock of Qingshankou 1st-2nd Member in the central depression being in mature stage is the primary source rock of both conventional oil and tight oil. Various sand bodies developing in the large-scale lacustrine delta and fluvial facies match well with source rocks and seal beds as reservoirs, forming upper, middle and lower petroleum systems. Tight oil are mainly distributed in Gaotaizi oil layers of the middle petroleum system and in Fuyu oil layers of the lower petroleum system. As to conventional oil reservoirs, there are three accumulation patterns named “accumulation below source”, “accumulation above source”, and“accumulation allochthonous to source”. In contrast, tight oil mainly form in two accumulation patterns named“accumulation in place” and“accumulation above source”. The effective source rocks control the distribution of both conventional oil and tight oil, while the sedimentary facies control the conventional oil reservoir type and the reservoir physical properties control the enrichment of tight oil. Based on fine evaluation of source rocks, the total oil resources are estimated as 102×108 t by basin modeling method. Six calibrating zones for conventional oil and three calibrating zones for tight oil are systematically evaluated, based on which the conventional oil resources are estimated as 88.7×108 t, and the tight oil resources as 12.7×108 t by analogy method. It is suggested that the Putaohua oil layers of Gulong depression, Daqing placanticline, and Sanzhao depression are the primary targets for conventional oil exploration in the near future. The Fuyu oil layers of Daqing placanticline, Sanzhao depression, and Qijia-Gulong depression are the favor targets of tight oil exploration.
Keywords: geological conditions; main controlling factors; accumulation patterns; resource potential; exploration direction; oil; Songliao Basin
投稿时间:2018-12-22  
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