老君庙古近系L油藏储层特征及分类评价研究

发布时间：2018-08-12 09:05

【摘要】：本文是中国石油重大科技专项“玉门油田重上百万吨”项目中部分内容。玉门老君庙油田地处酒西盆地老君庙背斜带的中部,是我国最早运用现代技术开发的油田。油田自1939年投入开发以来,走过了七十多年的开发历程,老一辈石油人为我们留下了许多宝贵的资料与经验。但是随着开发年限的增加,地下情况变得复杂,油藏整体开采难度加大,为下一步能更好保持老油田持续有效的稳产,论文以老君庙油田L油藏作为研究靶向,综合地质、岩心、测井、分析化验、开发动态等资料,以高分辨率层序地层学、沉积学、测井地质学、储层地质学、开发地质学等理论为指导,以地质统计学为方法,以计算机为手段,结合油田新井实际资料情况,开展了层组精细划分对比、储层沉积微相、储层四性关系、储层特征及储层分类评价研究,深化了对油藏地质特征的再认识,为油藏进一步水驱调整和下一步三次采油延长油田生命力,奠定坚实的地质基础。针对老君庙L油藏层状砂岩油藏的特点,以标志层的识别为手段,按照“井震结合、旋回控制、分级对比”的原则,相控辅助对比,完善了老君庙L油藏地层划分与对比。将L油层组划分为L1、L2、L3、L4、L5,5个砂层,15个小层,建立了研究区等时地层格架。纠正了前人对比不统一造成的窜层问题,重新认识确定了L4+5地层在全区发育,砂体在油藏西部发育,在油藏东部尖灭。在地层格架建立的基础上,通过区域构造运动及沉积背景研究,确定了老君庙L油藏储层物源来自于南东方向。沉积体系区域上由南东至北西分布的特征。借助取心井相标志识别、建立标准测井相,确定L油藏为辫状河～河三角洲沉积体系,发育辫状河、三角洲平原、三角洲前缘亚相。其中L3、L4、L5发育辫状河沉积,L2为三角洲平原沉积,L1为三角洲前缘沉积。通过沉积相以及沉积微相类型研究,建立了L油藏的沉积相模式,展示了老君庙L油藏沉积体系的时空演化特征。结合储层岩石学特征,开展储层四性关系研究,认为L油藏储层岩性对储层性质影响较大,孔渗相关性较好,泥质含量不高,但对储层的物性有影响。在此基础上,建立储层参数解释模型,实现从取心井的认识到非取心井到油藏的整体认识。储层特征研究表明,研究区内储层岩石类型相对单一,主要为石英砂岩,胶结物主要为钙质和泥质,类型复杂多样,其中以蒙脱石、伊利石、方解石最为重要。L油层储集空间以粒间孔为主,属于中高孔隙中渗高饱和油藏,三个主力砂层组中L3储层物性最好,L1物性最差,岩性细,泥质含量高,渗透率低。选用物性和孔隙结构为核心的综合分类方案,建立储层分类标准,将L油藏储层划分为三类。结合新取心井及开辟试验区新钻井动态反应,分析三类储层的动用情况,明确了Ⅱ类的一部分及Ⅲ类将是下一步重点挖潜的目标储层。
[Abstract]:This paper is part of the project of Yumen Oil Field which weighs millions of tons. Located in the middle of Laojunmiao anticline in Jiuxi Basin, Yumen Laojunmiao Oilfield is the first oilfield developed by modern technology in China. The oil field has been developed for more than 70 years since it was put into development in 1939. The older generation of petroleum people have left us a lot of valuable information and experience. However, with the increase of the development years, the underground situation becomes more complicated and the whole reservoir production becomes more difficult. In order to better maintain the stable and sustainable production of the old oil field, the paper takes the L reservoir of Laojunmiao Oilfield as the research target and synthesizes the geology. The data of core, logging, analysis, testing and development are guided by the theories of high-resolution sequence stratigraphy, sedimentology, logging geology, reservoir geology, development geology, etc. Combined with the actual data of new well in oil field, the fine division and correlation of formation, sedimentary microfacies of reservoir, relationship of reservoir four properties, reservoir characteristics and reservoir classification and evaluation are carried out, which deepens the understanding of reservoir geological characteristics. It lays a solid geological foundation for the further adjustment of water flooding and the extension of the vitality of the oil field in the next step. In view of the characteristics of stratified sandstone reservoir in Laojunmiao L reservoir, the stratigraphic division and correlation of Laojunmiao L reservoir are perfected by means of identification of mark layer, according to the principle of "combination of well and earthquake, cycle control and grading contrast". The L oil formation is divided into L _ (1) T _ (2) L _ (2) L _ (2) L _ (3) and L _ (4) L _ (5), 5 sand layers and 15 small layers. An isochronous stratigraphic framework has been established in the study area. This paper corrects the problem of channeling formation caused by the disunity of previous correlation, and determines that L45 formation is developed in the whole area, sand body is developed in the west of reservoir, and pinnacle is destroyed in the eastern part of reservoir. On the basis of the establishment of stratigraphic framework, through the study of regional tectonic movement and sedimentary background, the source of reservoir material in Laojunmiao L reservoir is determined from the southeastern direction. The distribution of sedimentary system from south to east to north and west. With the help of coring well facies identification and standard logging facies, L reservoir is determined as braided river delta sedimentary system, braided river, delta plain and delta front subfacies. Among them, L _ 3, L _ 4, L _ (4) and L _ (5) developed braided river sediments and L _ (2) were delta plain sediments and L _ 1 was delta front deposits. Based on the study of sedimentary facies and sedimentary microfacies, the sedimentary facies model of L reservoir is established, and the space-time evolution characteristics of sedimentary system in Laojunmiao L reservoir are demonstrated. Combined with the petrological characteristics of the reservoir, the relationship between the four properties of the reservoir is studied. It is considered that the lithology of the L reservoir has a great influence on the reservoir properties, the correlation of porosity and permeability is better, the content of mud is not high, but it has an effect on the physical properties of the reservoir. On this basis, a reservoir parameter interpretation model is established to realize the whole understanding from coring well to non-coring well. The study of reservoir characteristics shows that the reservoir rock types in the study area are relatively single, mainly quartz sandstone, and the cementation is mainly calcareous and argillaceous, the types of which are complex and diverse, including montmorillonite, Illite, The reservoir space of calcite reservoir is dominated by intergranular pore, which belongs to medium-high porosity and high permeability reservoir. Among the three main sand formations, the physical property of L3 reservoir is the best and that of L _ 1 reservoir is the worst, the lithology is fine, the muddy content is high, and the permeability is low. Based on the comprehensive classification scheme of physical property and pore structure, the reservoir classification standard is established, and the L reservoir is divided into three categories. Combined with the new coring wells and the new drilling performance reaction in the test area, the production of three types of reservoirs is analyzed, and it is clear that part II and type III will be the target reservoirs for the next step.
【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

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