塔河西部—间房组层序、沉积相及储层发育分布规律研究

发布时间：2018-04-07 00:14

本文选题：塔河西部　切入点：一间房组　出处：《成都理工大学》2015年硕士论文

【摘要】：本文以塔河油田西部奥陶系一间房组碳酸盐岩为研究对象,在充分吸收前人研究成果的基础上,运用沉积岩石学、层序地层学等多学科综合理论,利用岩芯观察描述、镜下薄片鉴定、钻井、录井、测井综合分析方法,开展研究区中奥陶统一间房组层序、沉积相以及储层的研究。通过对研究区相关井储层的综合解剖,探讨储层发育分布与层序、沉积相的关系,总结研究区储层发育分布规律及其影响因素。主要成果如下:(1)建立起研究区一间房组三级层序及四级(高频)层序格架,研究区一间房组可划分为1个独立的三级层序,进一步可划分为5个四级层序,由下到上,分别是四级层序Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ。三级层序由海侵体系域和高水位体系域构成,海侵体系域包含2个四级层序,高水位体系域包含3个四级层序。三级层序及四级层序均可实现全区对比,具有良好的可对比性。(2)在究区一间房组滩体解释基础上,以四级层序为单元,进行了沉积相及滩体展布研究分析,等时、动态地揭示了一间房组沉积相及滩体的时空展布和演化。海侵体系域晚期,即第Ⅱ个四级层序时期,滩体不发育,仅局部发育小规模点滩;高水位体系域早期,即第Ⅲ个四级层序时期,这些台内点滩在逐渐长大,但规模也较小;到高水位体系域中晚期,滩体优势发育,具体体现在第Ⅳ个四级层序时期,区内台内滩发育进入鼎盛时期,主要形成南北两个大型滩体,到第Ⅴ个四级层序时期,台内滩发育开始衰落,滩体变多,但规模有所减小。(3)对研究区储层进行了综合解剖。研究区一间房组发育溶蚀孔隙型储层、岩溶缝孔洞型储层、洞穴型储层及裂缝型储层,且岩溶缝孔洞型储层在区内最为发育。分析认为区内一间房组碳酸盐岩储层储渗空间形成经历了同生期大气水溶蚀作用、加里东中期大气水岩溶作用、加里东晚期-海西早期大气水岩溶作用、海西晚期埋藏热液溶蚀作用、破裂作用。溶蚀孔隙型储层是同生期大气水溶蚀作用的产物,受控于相对海平面的变化引起的沉积相、滩体发育情况的变化;岩溶缝孔洞型储层、洞穴型储层是加里东晚期-海西早期大气水岩溶作用与海西晚期埋藏热液溶蚀作用叠加改造的产物,主要受控于平行不整合面控制的大气水岩溶作用以及断裂沟通溶蚀的规模。(4)认识了研究区一间房组储层的发育分布规律。纵向上,结合四级层序单元内储层统计分析认识到区内一间房组储层发育具有强烈的靠顶部(上部)分布特征。溶蚀孔隙型储层主要分布在高位体系域上部的第Ⅳ、Ⅴ四级层序,即一间房组上部0~40m范围内;岩溶缝孔洞型储层和岩溶洞穴型储层可在整个一间房组第Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ个四级层序内发育,但主要分布在第Ⅲ、Ⅳ、Ⅴ个四级层序中,尤其是在第Ⅳ、Ⅴ四级层序中;裂缝型储层在研究区发育较少,规律性不是很明显。平面上,滩相溶蚀孔隙型储层仅发育在滩体内部,可能受古地理制约,北部滩体更容易发育此类储层;岩溶缝孔洞型储层在滩体内部,滩间部位均可发育,但具滩体内更发育的特征,且均表现为与断裂的关系密切,滩体与断裂的叠合部位是这两类储层发育的有利部位。
[Abstract]:This group of carbonate reservoirs in Tahe oilfield Ordovician in Western room as the research object, based on absorbing the results of previous studies, using sedimentary petrology, sequence stratigraphy theory and other disciplines, the use of core observation, thin section identification, drilling, logging, logging comprehensive analysis method, research area in Ordovician room sequence, sedimentary facies and reservoir research. Through the comprehensive anatomy of the study area of reservoir, reservoir distribution and sequence, the relationship of sedimentary facies, summarized the reservoir distribution law and its influencing factors. The main results are as follows: (1) establish a study room block three order sequence and four grade (high frequency) sequence frame, a room group study area can be divided into 1 independent three order sequences can be further divided into 5 four order sequences from bottom to top, respectively is four grade sequence I, II, III, IV, v. The three sequence consists of transgressive and highstand systems tract, transgressive system tract contains 2 four level sequence, HST consists of 3 four level sequence. Three grade sequence and four sequences can be compared with the contrast, good. (2) in a room of study area group the beach body based on the interpretation of grade four in the unit of sequence, the sedimentary facies and beach body distribution analysis, etc., dynamically reveal the sedimentary facies and yijianfangformation shoal at the time space distribution and evolution. The transgressive stage, namely the second four level sequence period, beach body development only, the local development of small scale point beach; HST early, namely III four level sequence period, the station point beach in gradually grew up, but the scale is smaller; to the late HST, beach development advantages, embodied in Article IV four level sequence period in the region intraplatform development into the peak During the period, mainly formed two large South Beach, to the V four level sequence period, intraplatform shoal development began to decline, more, but the scale decreased. (3) in the study area reservoir comprehensive anatomy. A room of group developed dissolution pore reservoir, karst fracture pore type reservoir, cave type reservoir and fractured reservoir, and the karst seam hole type reservoir in the region is the most developed area. The results indicated that yijianfangformation carbonate reservoir space through syngenetic dissolution of atmospheric water formation, middle Caledonian karstification of atmospheric water. Gary East Hercynian early meteoric water karstification, burial in late Hercynian hydrothermal dissolution, fracturing. Dissolution pore reservoir is a product of syngenetic dissolution of atmospheric water and sedimentary changes controlled by relative sea-level change phase, beach body development condition; karst seam hole reservoir layer That is the cave type reservoir in late Caledonian Early Hercynian period meteoric water karstification and burial in late Hercynian hydrothermal superimposed dissolution products, mainly controlled by atmospheric water rock parallel unconformity controlled dissolution and fracture dissolution communication scale. (4) understanding the distribution regularity of the development of a real research group the reservoir. Vertically, with the four grade sequence unit of reservoir in the statistical analysis to recognize area yijianfangformation reservoir development strongly rely on the top (upper). The distribution of dissolved pore type reservoir is mainly distributed in the upper part of the fourth HST, V four level sequence, namely a room is the range of 0~40m; karst fracture vuggy reservoir and karst cave type reservoir in the whole room group I, II, III, IV, V development four level sequence, but mainly in group III, IV, V four level sequence, especially in the fourth. V four order sequence ; fractured reservoir in the study area is less developed, regularity is not obvious. On the plane, beach erosion pore type reservoir is developed in beach body, may be affected by the paleogeographic constraints, North Beach Body easier development of this kind of reservoir; karst fracture pore type reservoir in the beach body, beach room site can be developed, but with more features in the development of the beach, and showed close relationship with fracture, and fracture of the composite beach body parts are these two types of reservoir development favorable position.

【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P539.2

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