塔河地区鹰山组—下丘里塔格组深层碳酸盐岩储层特征研究

发布时间：2017-12-27 18:37

本文关键词：塔河地区鹰山组—下丘里塔格组深层碳酸盐岩储层特征研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：在我国,塔河油田奥陶系深层的勘探程度整体较低,基础研究较为薄弱,深层领域的储层类型,储层成因和发育模式以及分布规律和主控因素等尚不明确,因此,论文以塔里木盆地鹰山组-下丘里塔格组为研究目的层,研究区域主要为塔河油田。论文通过文献资料的收集和查阅,相关单井的取样分析,运用测井、地球化学方法,以油气储层地质学理论为基础,结合油气藏构造地质学、沉积岩石学、岩相古地理等学科理论,对塔河地区深层碳酸盐岩储层的特征进行描述并对储层的主控因素进行分析研究。塔河地区鹰山组-下丘里塔格组储层岩石类型有灰岩,包括:颗粒灰岩、颗粒微晶灰岩、含颗粒微晶灰岩、微晶灰岩等;其次是白云岩,主要划分为非平直晶面它形-平直晶面半自形粉-细晶白云石、平直晶面半自形-自形细-中晶白云石、非平直晶面半自形-它形细晶白云石以及非平直晶面粗晶白云石四类。研究区目的层的储集空间有多种类型,主要有晶间孔、晶间溶孔、裂缝和溶蚀孔洞等,说明储层成因并不单一。通过对研究区单井沉积相的划分,进而对沉积相平面的展布,认为塔河地区鹰山组上段地层主要以碳酸盐岩台地沉积体系为主,蓬莱坝组揭示井少,但在本次研究的基础上结合前人的研究认为S88井和TS2井钻井取心揭示蓬莱坝组主要发育纹层状白云岩,具有典型的纹层构造,云化模式以渗透回流为主,因此S88井及TS2井区域应为局限台坪沉积。而鹰山组沉积时期,处于开阔台地相环境,台坪与台内浅滩亚相发育,潮间坪亚相也能够存在于局部浅滩顶部,随着水体变浅出现过渡岩相类型。在灰岩中,破坏储集性能的后生成岩作用主要有胶结作用、压实压溶作用、重结晶作用、硅化作用、沉积物(方解石)充填作用等;而改善储集性能的后生成岩作用主要有溶解作用、白云化作用、破裂作用等。其中加里东中期-海西早期之间抬升暴露后的古岩溶作用形成的溶蚀孔洞是本区奥陶系主要的储集空间。对白云岩来说,成岩作用主要有压实压溶作用、白云石化作用、胶结作用、对储层起到双重影响的过度白云石化作用、白云石新生变形及重结晶作用、硅化作用及硅质充填、其他自生矿物以及在白云岩地层中起着着重要作用的破裂作用。塔河地区奥陶系地层经历了多期构造运动,但加里东中期-海西早期构造抬升影响,是本区影响最大构造运动,也是岩溶发育期的最主要时期。因此遭受严重风化与剥蚀作用,但是不同区域的构造抬升不一样,所以残留了不同层位的奥陶系地层。海西早期剧烈的构造运动使隆起上下古生界受到强烈剥蚀,从南往北剥蚀强度逐渐变大,塔河主体中下奥陶统部分被剥蚀,出露地表,遭受大气淡水溶蚀。在大的构造抬升背景下,有多个次级构造活动相对停滞期,致使岩溶形成多套洞穴层。
[Abstract]:In China, Tahe oilfield Ordovician deep exploration degree is low, weak basic research, types of reservoir area, reservoir formation and development pattern as well as the distribution and controlling factors is not clear, therefore, the research purpose layer in the Tarim Basin Yingshan - Ritag group as the study area of inferior colliculus. Mainly for Tahe oilfield. This paper through literature data collection and analysis of relevant inspection, single well sampling, using logging and geochemical methods, the reservoir geology theory, combined with the subject of oil and gas reservoir tectonic geology, sedimentary petrology, lithofacies palaeogeography theory, describes the main control on the reservoir characteristic factors were analyzed the deep layer of carbonate reservoir in Tahe area. Tahe Yingshan hypothalamic formation reservoir rock types of limestone, including limestone particles, particles containing particles of microcrystalline limestone, microcrystalline limestone, microcrystalline limestone and dolomite; secondly, mainly divided into ofnonplanar form - straight hypautomorphic crystal face powder - fine grained dolomite, flat surface hypidiomorphic euhedral dolomite, fine - MICROTEK ofnonplanar subhedral anhedral dolomite and fine grained ofnonplanar coarse grained dolomite four. There are various types of reservoir space in the target layer of the study area, mainly intergranular pores, intergranular dissolution pores, cracks and dissolution pores, which indicate that the formation of the reservoir is not single. By dividing the phase of single well sedimentary research area, and the sedimentary facies distribution, that of Yingshan formation of upper Tahe area mainly in the carbonate platform depositional system, Penglai dam group revealed less well, but combined the previous studies in this study based on S88 and TS2 wells drilling coring revealed Penglai dam group mainly developed laminated dolomite, with laminated structure typical of the cloud model to seepage reflux, so S88 well and TS2 well area should be limited Taiwan flat. The Yingshan formation sedimentary period, in the open platform environment, Taiwan and Taiwan Ping in shallows subfacies developed tidal flat subfacies can also exist in the local bank at the top, with shallow water body transition facies types. In the limestone, damage to reservoir properties after the main diagenesis includes compaction, cementation, recrystallization, silicification, sediments (calcite) filling; and improve the reservoir performance after the main diagenesis includes dolomitization, dissolution, fracturing etc.. The karst cave formed by paleo rock dissolution after uplift and exposure in the early Caledonian Early Hercynian period is the main reservoir space of the Ordovician system in this area. The dolomite, the main diagenesis includes compaction, dolomitization, cementation, double effect on reservoir over dolomitization, neomorphism and dolomite recrystallization, silicification and siliceous filling and other authigenic minerals and dolomite formation plays a important role in rupture the role of. Ordovician strata in Tahe area underwent multi-stage tectonic movement, but the influence of tectonic uplift in the middle Caledonian Early Hercynian period is the most influential tectonic movement in this area, and is also the most important period of karst development. Therefore, severe weathering and denudation are caused, but the tectonic uplift of different regions is not the same, so the Ordovician strata in different layers are retained. In the Early Hercynian tectonic movement, the uplift and the upper Palaeozoic were strongly eroded, and the erosion intensity from south to north gradually increased. The middle and lower Ordovician in Tahe was partially eroded and exposed, and suffered from atmospheric fresh water erosion. In the large tectonic uplift background, there are a number of secondary tectonic activities relative stagnation period, resulting in the formation of karst caves.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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