胜坨28断块东一、东二段开发特征及剩余油评价

发布时间：2018-09-01 07:34

【摘要】：胜坨油田现已进入特高含水开发后期,储采矛盾十分突出,开发现状呈现出低采油速度、低采出程度、高含水的“两低一高”特征。因此,迫切需要对油田各储层进行综合研究。坨28断块位于东营凹陷北部,为一被断层切割复杂化的穹隆背斜,地层为河流相碎屑岩正旋回沉积;储层物性属于高孔、高渗储层;层间和层内非均质性不强,而平面非均质性较强;东一、东二段地下原油粘度较高,均属稠油油藏,有正常的温度压力系统。开发矛盾主要有:井网密度小,单井控制储量大;原油粘度大,含水上升速度快,注水开发见效不明显;注采对应率低,驱替不均衡等。本文针对坨28断块的地质特征和开发现状,首先在地质研究成果的基础上,对工区地层特征、沉积相、断裂系统、储层非均质性、油层发育特征及流体性质进行深入的分析及评价。以小层油砂体为单位,经核实储量参数,进行地质储量的复算。然后,通过对油藏生产现状、能量状况、注水受效状况等进行开发特征分析;通过水驱特征曲线法、产量递减法、累积曲线法等多种油藏工程方法,对可采储量及采收率进行预测,并进行开发特征评价。通过研究分析累积产量曲线特征,提出理想可采储量的概念,即油藏按照目前开发生产状况,直到产量递减为零时的理想最大可采储量。当油藏产量递减到经济极限产量时油藏将报废,这部分的累计产量为经济极限可采储量,即通常所说的可采储量。从经济极限产量递减到零的这部分累计产量则为非经济可采储量。因此,理想可采储量由经济极限可采储量和非经济可采储量两部分组成,其反映了油井的生产能力大小,比较适用于油井产能的评价。另外,理想可采储量与地质及工程因素有关,当储量越大、物性越好、注采越完善,则理想可采储量越大。经研究,理想可采储量大于经济极限可采储量,并且两者呈清晰的直线比例关系。本文主要通过计算单井剩余可采储量,来得到坨28断块东一、东二段剩余油平面分布,明确了该区剩余油挖潜的目标井区。运用聚类分析将研究区所有井的剩余可采储量与含水率进行分类。通过逐井小层产量劈分,计算和预测了各井各小层的剩余可采储量,从而明确了剩余油富集的主力挖潜层位。最后,对典型小层进行了剩余油成因类型的分析,主要划分了井网控制不住、井间滞留区、注采不完善、层间干扰这4类主要的剩余油成因类型,并绘制了剩余油成因类型分布图,最后有针对性地提出了剩余油挖潜目标和井位措施,提供生产参考。
[Abstract]:Shengtuo Oilfield has entered the late stage of super high water cut development, and the contradiction of storage and production is very prominent. The present situation of development presents the characteristics of "two low and one high" with low oil production rate, low production degree and high water cut. Therefore, there is an urgent need for comprehensive study of each reservoir in the oil field. Tuo 28 fault block is located in the northern part of Dongying sag. It is a complicated dome anticlastic anticlase with fault cutting. The strata are fluvial clastic rock positive cycle deposition, the reservoir physical property belongs to high porosity and high permeability reservoir, and the heterogeneity between layers and layers is not strong. However, the plane heterogeneity is strong, and the underground crude oil in the first and second member of the eastern part is of high viscosity, which belongs to the heavy oil reservoir and has a normal temperature and pressure system. The main development contradictions are as follows: small density of well pattern, large controlled reserves of single well, high viscosity of crude oil, fast rise speed of water cut, low corresponding rate of injection and production, uneven displacement and so on. In this paper, according to the geological characteristics and development status of Tuo 28 fault block, the stratigraphic characteristics, sedimentary facies, fault system and reservoir heterogeneity in the working area are analyzed on the basis of geological research results. The characteristics of reservoir development and fluid properties are analyzed and evaluated in depth. Taking the small oil sand body as the unit, the reserve parameters are verified and the geological reserves are recalculated. Then, through the analysis of development characteristics of reservoir production status, energy status, water injection efficiency, and other reservoir engineering methods, such as water drive characteristic curve method, production decline method, cumulative curve method and so on, The recoverable reserves and oil recovery are predicted and the development characteristics are evaluated. By studying and analyzing the characteristics of cumulative production curve, the concept of ideal recoverable reserves is put forward, that is, the ideal maximum recoverable reserves of reservoirs developed according to the present production conditions until the production decline to 00:00. When the reservoir production decreases to the economic limit, the reservoir will be abandoned. The cumulative production of this part is the economic limit recoverable reserves, that is, the recoverable reserves. The cumulative production from economic limit to zero is non-economic recoverable reserves. Therefore, the ideal recoverable reserves are composed of two parts: economic limit recoverable reserves and non-economic recoverable reserves, which reflect the production capacity of oil wells and are more suitable for the evaluation of oil well productivity. In addition, the ideal recoverable reserves are related to geological and engineering factors. The larger the reserves, the better the physical properties and the more perfect the injection and production, the larger the ideal recoverable reserves. The results show that the ideal recoverable reserves are larger than the economic limit recoverable reserves, and the relationship between them is linear. In this paper, by calculating the remaining recoverable reserves of single well, we can get the distribution of the remaining oil in the first and second sections of Tuo 28 fault block, and the target well area for tapping the potential of remaining oil in this area is determined. The remaining recoverable reserves and water cut of all wells in the study area are classified by cluster analysis. The remaining recoverable reserves of each well are calculated and predicted by dividing the production of each well into small layers, and the main potential layer of remaining oil enrichment is determined. Finally, the genetic types of residual oil in typical sub-layers are analyzed. The four main types of residual oil are divided into four main types, which are uncontrollable well pattern, interwell retention zone, imperfect injection and production, interlayer interference, etc. The distribution map of the genetic types of residual oil is plotted. Finally, the target of tapping potential of remaining oil and the measures of well location are put forward in order to provide a reference for production.
【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】：TE327

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