新立油田Ⅳ区块扶杨油层储层建模研究

发布时间：2018-04-16 23:13

本文选题：储层建模 + 小层划分　；参考：《长江大学》2015年硕士论文

【摘要】：研究区新立油田Ⅳ区块地处松辽盆地中央坳陷区,扶余—新木隆起最西端的新立穹隆背斜构造上的新立油田中部,开发面积10.18平方公里,地质储量1036.56万吨,可采储量为300.62万吨,标定采收率29%。属于低渗透构造-岩性油藏的油藏特征,平均渗透率为11.05MD,平均孔隙度14.4%。原始地层压力12.2MPa,饱和压力9.6MPa。本次研究的目的层段为下白垩系的泉四段和泉三段上部的扶余、杨大城子油层,储层以细砂岩为主,沉积环境属于河流—三角洲相沉积。Ⅳ区块于1984年全部投入开发,初期采用300米井距正方形反九点法面积注采井网,井排方向为北东67.5度,1997年注采井网调整为134米线性注水,同时对在注水井排的高含水油井转注,2004、2005及2008年进一步进行井网加密调整、扩边等。截至到2012年12月,在册油水井总数292口,其中采油井199口,开井136口,年产油4.27万吨,累积产油200.64×104t,采油速度0.41%,采出程度19.36%,可采储量采出程度66.7%,剩余可采储量采油速度4.27%,平均综合含水74.79%。在册注水井93口,开井65口,日注水1430 m3,平均单井日注22m3/d,年注水54.2×104m3,累积注水991.16×104m3,月注采比2.49,累积注采比1.93,地下存水率79.5%。Ⅳ区块自1984年规模投产以来,随着油田不断地深入开发,目前已进入了“高产水、高开采”的阶段,严峻的开发的形势已凸显出来。而随着动态、静态资料的增加、认识程度的加深,各种开发中所面对的问题也随之涌现出来,所以此刻就要求不断地对目前已有的研究成果进行调整和改进。同时由于油田现今油藏的分布情况已极其的复杂,故此时就很有必要对研究区进行三维储层地质建模,通过对研究区的孔隙度、渗透率和含油饱和度的研究,来弄清其中油藏的分布情况,从而能更好地对油田后期调整开发工作起到指导,进而显著的提高油田开发生产的采收率。本文以沉积学、高分辨率层序地层学、测井地质学、地质统计学等学科为指导,通过观察研究区取心井岩心,来弄清本研究区的砂体发育情况、岩心沉积微相类型及发育规律和特征。利用精细的单层划分与对比方法,建立起研究区的精细地层格架。根据岩心观察的结果来建立其测井响应模板,通过已建立好的模板来进行全区单井相的划分,选取骨干连井剖面进行沉积相剖面研究,最终绘制每小层的沉积微相平面图,以此得出研究区的沉积演化模式。在上述研究的基础上,通过建立研究区的地质知识库,利用Petrel油藏地质建模软件,建立储层三维地质模型；并且结合沉积微相研究成果,建立了储层沉积微相模型；在了解应用地质统计学和随机模拟方法的基础上,对研究区建立孔隙度、渗透率及含油饱和度的属性随机模型,建立沉积相控制下的三维属性地质模型,并对模型进行随机模型新钻井检验。最后结合后期所做含油饱和度分布图,来为油田进一步的开发和挖潜提供有利的地质条件。通过对研究区的研究工作,该论文取得了以下一些结论及认识：1、以高分辨率层序地层学为理论基础,结合区域性标志层,即一套在研究区发育的较纯的厚层泥岩段作为标志层,进行各砂层组的划分与对比。再以研究区内取心井为标准井,通过岩心观察并结合前人的原划分方案,来确定扶杨油层的各分层界限。将研究区扶杨油层在纵向上分为9个砂组26个小层,在小层研究基础上,将扶杨油层细分为35个单层。2、根据沉积相研究认为Ⅳ区块扶杨油层发育水下分流河道、席状砂、河口坝、河道间漫溢薄层砂、分流河道、决口扇、泛滥平原,间湾等沉积微相,边滩、河漫滩等沉积微相。3、通过地震资料的综合解释得到了砂组层面数据和断层数据,在结合小层对比建立了研究区的构造格架模型,再以沉积微相研究为基础,使用确定性建模的方法建立研究区的沉积相模型。4、对Ⅳ区块进行沉积相控制下的随机储层孔隙度模拟。对渗透率的模拟,由于渗透率和孔隙度有很好的相关关系,于是再利用孔隙度控制模拟渗透率,最后根据测井解释得到的含油面积来控制模拟含油饱和度的三维模型。这种相控及协同模拟的方式之下能够得到更高精度的储层地质模型。5、对于检验本工区随机模型的准确性,本文采取了随机新钻井检验的方法,通过前后对比新井剖面与原始剖面的大体一致,仅在井点局部略有差异,说明在此次建模过程中所选择的建模方法是合理的,所建立的模型的可信性,并有对研究能起到较好的预测性。6、本次储量计算采用容积法计算,得出5、8、9、13、14、16等小层储量相对较高,是研究区的主力油层。通过本次研究,建立了高精度的三维地质模型,根据含油饱和度模拟的分布状况和储量的估算,能较好评价油藏储能,对新立油田Ⅳ区块油藏开发方案今后的调整和开发提供重要的地质依据。
[Abstract]:The study area of Xinli oilfield IV block is located in the central depression of Songliao basin area, Fuyu has the most western new Ryuichi Lixin anticline structure of Xinli oilfield development in central area of 10.18 square kilometers, geological reserves of 10 million 365 thousand and 600 tons, recoverable reserves of 3 million 6 thousand and 200 tons, the recovery of 29%. calibration reservoir belongs to low permeability structure lithologic reservoir, the average permeability is 11.05MD, the average porosity of 14.4%. original formation pressure 12.2MPa, saturation pressure 9.6MPa. the purpose of this study is under the layer of the Cretaceous period and the three period of the spring four upper Fuyu, Yangdachengzi reservoir, with fine sandstone, the sedimentary environment belongs to fluvial delta facies IV. Block in 1984 all put into development, the initial 300 meters spacing square inverted nine spot area of injection production pattern, as well as the north east direction row 67.5 degrees, 1997 well network adjustment is 134 meters linear water injection, at the same time In the high water cut wells injection injection wells row, 20042005 in 2008 and further well pattern infilling, edge expansion. As of December 2012, registered a total of 292 wells, the production of 199 wells, open wells 136, the annual output of 42 thousand and 700 tons, the cumulative oil production of 200.64 * 104t, the oil extraction rate of 0.41%, recovery the degree of 19.36%, the recoverable recovery factor of 66.7%, the remaining oil recovery rate of recoverable reserves of 4.27% 74.79%., the average water content in 93 injecting wells, open wells 65, day water 1430 m3, the average single well injection 22m3/d, annual water injection of 54.2 * 104m3, 991.16 * 104m3 month cumulative water injection, the injection production ratio of 2.49 1.93, the cumulative injection production ratio, underground water storage rate 79.5%. IV block since 1984 the scale of production, with the deepening of oilfield development, has entered the "high water, high exploitation stage, severe development situation has been highlighted. And with the increase of the dynamic and static data, Knowledge of the deeper, all facing in the development of problemscome out, so this requires constantly on the current research results has been adjusted and improved. At the same time as the distribution of oil reservoir has been extremely complex today, so it's necessary to perform 3D geological modeling of reservoir in the study area, through the in the research area of porosity, permeability and oil saturation, to find out the distribution of the reservoir, so as to improve the work of oilfield development and adjustment to guide the recovery, and significantly improve the oilfield development and production. This paper based on sedimentology, high-resolution sequence stratigraphy, logging geology, geological statistics and other disciplines as a guide through the observation, the study area core, to understand the development situation of body in the study area of sand microfacies and development regularity of the core and features. By using fine deposition The single layer division and contrast method, establish the fine stratigraphic framework in the study area. According to the core observation results to build the logging response template, through established a good template for the single well facies division, selection of backbone connecting well section of the final section of the sedimentary facies, sedimentary micro drawing of each layer phase plane diagram, as that of depositional evolution mode. On the basis of the above research, through the geological knowledge base is established in the study area, using Petrel reservoir geological modeling software, the establishment of three-dimensional geological model of reservoir sedimentary microfacies; and combined with the research results, established the reservoir sedimentary facies model; based on the understanding of the application geological statistics and stochastic simulation method, establish the porosity in the study area, property of stochastic model of permeability and oil saturation, 3D geological model established under the control of sedimentary facies, and the model The new drilling test. Finally, the stochastic model later made oil saturation distribution, to provide favorable geological conditions for oil field development and potential further. Through the research work in the study area, the paper has made the following conclusions: 1, understanding and using the high resolution sequence stratigraphy theory, combined with the regional flag a layer in the study area developed relatively pure thick mudstone layer as a symbol, the division and correlation of each sand group. In the study area of coring well as standard wells, through core observation combined with the previous primary partition scheme to determine the hierarchical boundaries of Fuyang. The study area of Fuyang reservoir in the longitudinal direction is divided into 9 sand groups 26 small layer based on layer on the Fuyang reservoir is subdivided into 35 single.2, according to the study of sedimentary facies of Fuyang reservoir in block IV that the development of underwater distributary channel, dock Like sand, river mouth bar, overflowing thin sand, distributary channel, crevasse splay, flood plain, bay sedimentary facies, shoal, floodplain sedimentary microfacies such as.3, through the comprehensive interpretation of seismic data obtained sand level data and fault data, in combination with smallcomparedlayer built structure the framework model of the study area, the study of sedimentary microfacies based on sedimentary facies model using the method of deterministic modeling of.4 in the study area, stochastic simulation of reservoir porosity is under the control of IV block deposition. Simulation of permeability, because there is good correlation between permeability and porosity, so the control simulation of three-dimensional model of porosity permeability, finally according to the logging interpretation the oil-bearing area to control the simulation of oil saturation. This phase control and collaborative simulation can get the reservoir geological model.5 with higher accuracy, for inspection The accuracy test in this area of the stochastic model, this paper adopted a method of random inspection of new drilling, by roughly the same contrast before and after the new well section with the original section, only in the local wells is slightly different, the modeling method of choice in the modeling process is reasonable, the credibility of the model, and the the research can play a better prediction of.6, calculated by volumetric method to calculate the reserves, the 5,8,9,13,14,16 layer reserves is relatively high, is the major reservoir of the research area. Through this study, established the three-dimensional geological model of high precision, according to the simulation of oil saturation distribution and reserves, can evaluation of reservoir can provide important geological basis of Xinli oilfield IV reservoir development project adjustment and development in the future.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】