鸭儿峡作业区志留系油藏剩余油分布规律

发布时间：2018-04-18 22:27

本文选题：潜山变质岩 + 裂缝分布　；参考：《西安石油大学》2015年硕士论文

【摘要】：鸭儿峡油田志留系变质岩油藏地质条件复杂,断层多且储层岩性变化大,多年来主要围绕潜山高部位及次高部位挖潜,缺乏油藏特征和开发潜力整体评价。因此开展油藏特征和剩余油分布规律研究,对于有利目标井位优选和开发方案设计具有重要参考价值。(1)根据小层划分与对比结果,研究区间杂段厚度变化不大,西南部、西北部紫色段变薄,部分井中消失,东南部紫色段厚度增大。地层表现出东北高、西南低的特点。鸭儿峡志留系断层主要以北东向、北西向为主、其次为近南北向、近东西向。这四组断层将鸭儿峡志留系潜山切割成大小不同的数十个断块。(2)根据测井曲线类型,建立了不同测井系列的裂缝、有效裂缝识别方法。电阻率小于电阻率60?·m为干层,在60?·m至90?·m之间为差油层,电阻率大于90?.m为油层。裂缝方向主要为北东和北西方向,裂缝类型以斜交缝为主,北东方向的裂缝是油气的主要疏导通道,而北西向裂缝则为油气的扩散提供了更多路径。不同岩性的电阻率和声波时差测井值差异大,千枚岩和白云岩的裂缝发育程度要高于变质砂岩。(3)裂缝是研究区最主要的储集空间,此外还发育一定程度的微孔。孔隙度分布呈土豆状,平面上分布差异较大。北东向断层附近井产量明显要高于北向断层,寻找油藏应该以北东向断层为主。断裂作用形成的各级裂缝是控制有效油气储层的关键因素,油气显示较好的井段均与裂缝发育程度有关。研究区变质砂岩和千枚岩的裂缝发育程度要高于白云岩。以孔隙度、含油饱和度、裂缝开度、有效厚度、渗透率为基础,在充分考虑各因素权重的条件下,对储层进行了静态评价,评价结果与生产动态一致。(4)以测井和测井解释结果为基础,建立了研究区的三维地质模型。根据属性模型,对研究区各小层的储量进行了重新拟合,三个小层地质建模所的储量合计为1069.7万吨。开发前研究区构造高点等处丰度值较高,经过52年生产,高丰度区的累计产量高,丰度下降明显。剩余油主要特征表现为生产井附近剩余油饱和度低,平面上剩余油分布受生产井控制明显,井密的地方,井间剩余油饱和度低。根据剩余油分布图和丰度场,优选了3个井位。
[Abstract]:The Silurian metamorphic rock reservoir in Yanerxia Oilfield is characterized by complex geological conditions, many faults and great changes in reservoir lithology. For many years, it has been mainly focused on tapping potential at the high and secondary positions of buried hill, lacking of overall evaluation of reservoir characteristics and development potential.Therefore, the study of reservoir characteristics and remaining oil distribution is of important reference value for the optimum selection of favorable target wells and the design of development scheme. According to the results of stratification and correlation, the thickness of the studied interval is not changed much, but in the southwest.The purple section in the northwest becomes thinner, some wells disappear, and the thickness of the southeastern purple section increases.The strata show the characteristics of high in the northeast and low in the southwest.The fault of Silurian is mainly north to east, north to west, followed by near north to north and near east to west.The four groups of faults cut the Silurian buried hill in Yalxia into dozens of fault blocks of different sizes. (2) according to the type of logging curves, the effective fracture identification method of different logging series was established.The resistivity less than 60 m is dry layer, the difference layer is between 60 m and 90 m, and the resistivity is greater than 90 m.The fracture direction is mainly NE and NW, and the fracture type is skew fracture. The NNE fracture is the main channel of oil and gas diversion, while the NW fracture provides more paths for oil and gas diffusion.The resistivity of different lithology and the logging value of acoustic time difference have great difference. The fracture development degree of phyllite and dolomite is higher than that of metamorphic sandstone. The fracture is the most important reservoir space in the study area. In addition, micropores are developed to a certain extent.The distribution of porosity is potato like, and the distribution is different on the plane.The production of wells near the NNE fault is obviously higher than that of the NNE fault, and the finding of the reservoir should be mainly Neast-trending fault.Fracture formation is the key factor to control the effective oil and gas reservoir, and the better oil and gas show is related to the degree of fracture development.The fracture development degree of metamorphic sandstone and phyllite is higher than that of dolomite.On the basis of porosity, oil saturation, fracture opening, effective thickness and permeability, the static evaluation of reservoir is carried out under the condition of fully considering the weight of various factors.Based on the results of well logging and log interpretation, a 3D geological model of the study area was established.According to the attribute model, the reserves of each sublayer in the study area are refitted. The reserves of the three sub-layer geological modeling institutes are 10.697 million tons in total.After 52 years of production, the accumulative yield of high abundance area was high and the abundance decreased obviously.The main characteristics of the remaining oil are that the remaining oil saturation near the production well is low, the distribution of the remaining oil on the plane is obviously controlled by the production well, and where the wells are dense, the remaining oil saturation between the wells is low.According to the remaining oil distribution map and abundance field, three wells were selected.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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