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古隆起是含油气盆地重要的构造单元,研究古隆起的分布及演化,并阐明其对沉积的控制作用,对于油气勘探具有重要的研究意义.通过岩心、测井资料、地震资料和野外露头的综合研究,建立了塔北西部层序地层格架,卡普沙良群内部划分为4个三级层序,在此基础上再造了卡普沙良群各层序发育时期古隆起的分布及其演化,SQ1沉积时期古隆起呈近东西向展布,横跨整个工区,由中部向东、西两侧加宽,隆起剥蚀面积为1 946km~2,SQ2时期隆起范围缩小,中部隆起被淹没,东部残余2个小的剥蚀区,西部剥蚀区范围较大,总面积约为1 365km~2,SQ3时期隆起范围进一步缩小,东部整体被淹没,西北部残余古隆起面积为899km~2,至SQ4时期古隆起消失.立足于岩心观察,结合岩矿组合、测井等资料,识别出辫状河三角洲、氧化型浅水三角洲、滨浅湖滩坝和滨浅湖4种主要的沉积体系类型.最终充分运用地震、测井、岩心及分析化验等资料,采用盆地分析的思想,综合研究了构造、古隆起、沉积古地理等要素,揭示了古隆起及源-汇体系的配置关系,研究区发育自古隆起向南北两侧供源及南部远源供源两套物源体系,北部临近隆起剥蚀区的两侧发育短物源形成的辫状河三角洲沉积,随着隆起面积的减小,辫状河三角洲分布范围逐渐减小,而南部长轴物源形成氧化型浅水三角洲沉积体系,呈现由SE向NW向逐步进积的趋势,范围逐步扩大.古隆起的发育除为区域提供物源外,还有利于岩性圈闭和地层圈闭的发育,南部的滨浅湖滩坝砂体也具有作为岩性圈闭的良好潜力.
Paleo uplift is an important tectonic unit in petroliferous basins, so it is important to study the distribution and evolution of paleo-uplift and clarify its control over sedimentation, which is of great significance for oil and gas exploration.Based on core, well logging data, seismic data and outcrop Based on the comprehensive study, the sequence stratigraphic framework of the western Tabei North region has been established. The interior of the Kapusha Liang Group has been divided into four third-order sequences. On the basis of this, the distribution and evolution of paleo-uplift during the sequence development of the Kapushalens During the depositional period of SQ1, the paleo-uplift spread nearly east-west, across the work area, widening to the east and west sides from the middle part. The area of uplift and erosion was 1 946 km ~ 2, the uplift range of SQ2 was reduced, the uplift of middle part was submerged, In the remaining 2 small denuded zones, the western denuded zone has a large area with a total area of about 1 365 km 2. The uplift of the SQ3 period further narrowed down and the whole was submerged in the east part. The residual paleohigh surface area in the northwest was 899 km 2, Based on the core observation, combined with the combination of rock and mine, well logging and other data, the four types of sedimentary system types of braided river delta, oxidized shallow water delta, coastal shallow lake beach dam and shore and shallow lake are identified. Shipped Based on the seismic analysis, well logging, core analysis and laboratory analysis, and using the thought of basin analysis, this paper synthetically studies the tectonic, paleohigh and sedimentary palaeogeographic elements and reveals the relationship between paleo-uplift and source-sink system. Uplifted to the north and south sides of the source and the southern source for the two sets of provenance systems, the northern part of the northern region near the uplifted denudation of short source provenance braided river delta deposition, with the uplift area decreases, braided river The distribution range of the delta is gradually reduced, while the oxidized shallow-water delta sedimentary system is formed in the southern long-axis provenance, showing a gradual ensemble of products from SE to NW, and the scope of the delta is gradually widened. In addition to providing resources for the region, Is conducive to the development of lithologic traps and stratigraphic traps, and the southern coastal shallow lake dam body also has good potential as a lithologic trap.