挪威陆缘盆地形成演化及其成藏过程分析

发布时间：2018-04-17 16:19

本文选题：挪威西部陆架 + 构造演化　；参考：《西安石油大学》2017年硕士论文

【摘要】：挪威西部海域陆架位于邻近北极地区的挪威海域,油气资源丰富,是当今油气勘探的重点区域之一。本文以含油气盆地分析理论为指导,以现有的油气田勘探开发基础资料为依据,开展了该区构造沉积演化及油气成藏地质条件过程研究,并在合理设定地质参数基础上,利用盆地模拟软件Petromod,对该陆缘盆地油气成藏过程进行模拟,取得以下认识和结论:(1)研究区构造演化与北大西洋的裂开关系密切,该区域盆地分别经历了3期裂谷-坳陷-热沉降演化旋回,其中第2期裂谷-旋回期间发育侏罗系烃源岩和第3期裂谷-旋回期间发育的上白垩统烃源岩为盆地的主力烃源岩。(2)二维剖面有机质成熟度热演化史模拟结果表明:(1)目前,下侏罗统Are组烃源岩全部进入生气阶段,其中埋藏较深处已处于过成熟演化阶段;(2)上侏罗统Spekk组烃源岩目前大部处于生油阶段,仅埋藏较深处已处于过成熟阶段;(3)上白垩统Cromer Knoll组烃源岩,除了次盆地边缘隆起区外Cromer Knoll组烃源岩处于生油阶段外,其它区域均处于生气阶段。(3)在Voring次盆,包括2个已探明的侏罗系含油气系统:一是下侏罗统Bat群Are组煤层、页岩-中侏罗统Fangst群砂体含油气系统(!),属下生上储型成藏组合;另一个是上侏罗统Viking群Spekk组页岩-中侏罗统Fangst群砂体含油气系统(!),为典型的上生下储成藏组合。在More次盆,可能存在2个含油气系统,其中包括1个已经探明的含油气系统,即上白垩统Cromer Knoll群Lange组页岩-上白垩统Cromer Knoll群砂岩含油气系统(!),属下生上储型的成藏组合;该盆地另一个含油气系统是侏罗系Heather组泥页岩-中侏罗统Heather等组砂岩含油气系统(?),推测该系统为一潜在的含油气系统,推测为上生下储型的成藏组合。(4)综合分析认为More次盆和Voring次盆内油气从烃源灶区生成后在超压和浮力作用下沿着裂缝、断层、不整合面及连通的砂体等疏导体系再次运移至凸起区富集成藏,因而两次盆内部凸起区是勘探的有利区。
[Abstract]:The continental shelf of western Norway is located in the Norwegian sea area adjacent to the Arctic region. It is rich in oil and gas resources and is one of the key oil and gas exploration areas.Guided by the theory of petroliferous basin analysis and based on the existing basic data of exploration and development of oil and gas fields, this paper studies the process of tectonic sedimentary evolution and oil and gas reservoir forming geological conditions in this area, and on the basis of reasonable setting of geological parameters,Using the basin simulation software Petromod, the oil and gas accumulation process in the continental margin basin is simulated. The following conclusions are obtained: the tectonic evolution of the studied area is closely related to the North Atlantic rift.The regional basin has undergone three periods of rift depression thermal subsidence evolution cycle respectively.The source rocks of Jurassic and Upper Cretaceous are the main source rocks of the basin during the second rifting cycle and the third rift cycle.) the simulation results of the maturity thermal evolution of organic matter in the two-dimensional section show that: 1) at present, the source rocks of the upper Cretaceous are the main source rocks of the basin.The source rocks of the Are formation of the Lower Jurassic have all entered the gas generation stage, in which the deeper buried source rocks are in the over-mature stage of evolution.) most of the source rocks of the Spekk formation of the Upper Jurassic are in the stage of oil generation at present.The source rocks of the Upper Cretaceous Cromer Knoll formation are only buried in the over-mature stage. The source rocks of the Cromer Knoll formation are in the oil generation stage except for the sub-basin marginal uplift, and all the other regions are in the generating stage in the Voring secondary basin.There are two proven Jurassic oil and gas systems: one is the Are coal seam of the Bat group of the Lower Jurassic, the oil and gas bearing system of the Fangst group of shale-middle Jurassic, and the reservoir forming assemblage of its subordinates;The other is the oil and gas bearing system of the shale-middle Jurassic Fangst sandbody in the Spekk formation of the Viking group of the Upper Jurassic, which is a typical assemblage of upper and lower reservoirs.In the More subbasin, there may be two oil and gas bearing systems, including one proved oil and gas system, that is, the shale-upper Cretaceous Cromer Knoll sandstone hydrocarbon bearing system of the Cromer Knoll group in the Upper Cretaceous, and the assemblage of the oil and gas reservoirs of the upper and upper Cretaceous reservoirs.Another oil and gas bearing system in this basin is the sandstone oil and gas system of shale shale-middle Jurassic Heather and so on in Heather formation of Jurassic system, which is supposed to be a potential oil and gas bearing system.It is inferred that the oil and gas in More secondary basin and Voring secondary basin are generated from the hydrocarbon source foci and followed by fractures and faults under the action of overpressure and buoyancy.The unconformable surface and connected sand bodies are transported again to the rich integrated reservoirs in the uplift area, so the two protrusions in the basin are favorable areas for exploration.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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