辽河盆地东部凹陷火山岩储层测井评价方法研究
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摘要
辽河盆地火山岩分布广泛,经过近几年的努力勘探,相继发现了许多储量丰富的火山岩油藏,至2002年底,在火山岩储层中已上报探明石油地质储量3169×10~4t,并且在东部凹陷黄沙坨油田建成了年产25×10~4t以上的生产能力,展示了一定的勘探开发前景。因此积极探索火山岩储层勘探新领域,寻找新的储量接替区已成为一个重要的勘探方向。
     火山岩储层属特殊岩性裂缝—孔隙型储层,其储层评价在国内外都是一个较难的课题,尽管国内外有关专家作出了不懈的努力,攻克了许多难关,并积累了一定经验,但由于火山岩储层的复杂性及地质状况、技术发展水平等方面不尽相同,因此在地质认识,勘探开发思路和技术方法上虽然有共同点,但也有各自的特点和差异。本文根据辽河盆地东部凹陷火山岩地质资料,学习和借鉴国内外先进的技术方法和经验,在火山岩岩性识别、储层识别、储层分类、巨厚火山岩期次划分、储层参数确定六个方面,开展了测井评价方法研究,总结出了适合地区特点的、可操作性强的火山岩储层测井评价方法。
     岩性识别方面:考虑火山岩岩石矿物种类多、变化大,即岩性复杂的特点,从岩矿分析等岩石物理研究入手,通过岩石测井评价机理深入分析,确定了氧化钾(K_2O)含量与自然伽玛(GR)关系法、M—N交会图法、Φ_(CNL)与Rt交会图法、Φ_(CNL)、ρ_b、Δt与GR交会图法四种方法识别火山岩岩性。尤其是根据K_2O含量与GR关系,创立了自然伽玛曲线定量识别玄武岩与粗面岩的方法,精度高,效果显著。并首次用Φ_(CNL)与Rt交会图法定性划分火山岩的蚀变程度,即Ⅰ类未蚀变或轻度蚀变、Ⅱ类中度蚀变、Ⅲ类强度蚀变、Ⅳ类泥化,储层发育在Ⅱ类和Ⅲ类蚀变的火山岩中,为储层评价提供了基础。
     储层识别方面:在岩性准确划分基础上,确定粗面岩为有效储集岩类,在储集岩中以岩心的含油性与物性关系分析研究及试油资料为基础,建立了测井信息与储层特征的对应关系,确定以R_t—Δt、ρ_b-Δt、R_t-Φ_(CNL)等测井交会图方法定量识别储层及定性识别储层相结合的方法。特别在利用声、电成像测井新技术识别裂缝,确定孔隙类型的应用方面,通过结合常规测井及岩心资料,研究分析了成像测井的影响因素,已建立了用声、电成像测井识岩石真假裂缝的模式。确定了以3700测井系列储层定量识别与定性识别相结合,辅以成像测井的储层直观识别方法,提高了储层解释符合率。
     储层参数确定方面:通过对矿物成份分析,利用测井交会图技术,准确确定了火山岩岩石骨架的Δt、ρ_b、Φ_(CNL)值,确定了用声波时差Δt计算基质孔隙度的有效方法。通过对声、电成像测井从理论、处理解释到应用研究,建立了用声、电成像测井计算裂缝孔隙度方法,解决了储量计算确定裂缝孔隙度的难题。
     储层分类评价方面:根据岩心毛管曲线分类及试油试采资料,首次创立了以R_t—Δt交会图方法对火山岩储层进行分类,该方法结合声电成像测井及储层参数解释结果,并考虑岩石的蚀变程度,实际应用效果突出。
     火山岩期次划分方面:对巨厚粗面岩建立了首先用自然伽玛曲线划分明显的期次,然后用电阻率、
    
    大庆石油学院硕士研究生论文
    中子孔隙度曲线结合声电成像测井划分小的期次的划分力一法。该方法在对黄沙沱油田火山岩油藏期次划
    分评价应用中,取得了较好效果,为分期次评价火山岩奠定了基础。
     本文所确定的3700测井系列结合成像测井评价火山岩储层的方法,经在黄沙沱油田火山岩储层中
    应用,提高了测井解释符合率,效果显著,适合本地区的地质特点,适用性及可操作性强,;仁且可在其
    它地区类似的储层中借鉴或推广。
Volcanic rocks were broadly distributed in Liaohe basin. Through years of exploration, many volcanic rocks with abundance reserves have been discovered. By the end of 2002, submitted proved oil in place in such reservoirs was 3169×104t. In Huangshatuo oilfield of eastern sag, established annual capacity is 25 ×104t, showing certain exploration and development future. Therefore, try to discover volcanic reservoirs and find new reserve replacement area have become an important orientation of exploration.
    Volcanic reservoirs belong to special lithology, fractured-porous reservoirs, and the reservoir evaluation is a difficult subject at home and abroad. Although experts have done much effort, solved a lot of problems, had certain experience, and reached agreement in some issues, they still have different opinions in geological understanding, exploration and development thought, and technical methods due to reservoir complexity, various geological conditions and technical level. According to geological data of volcanic rocks in the eastern sag of Liaohe basin, by learning and referencing advanced technical methods and experience at home and abroad, the study of logging evaluation methods has been conducted in six aspects, including identification of volcanic lithology, reservoir identification, reservoir classification, division of stages of massive volcanics, and reservoir parameter determination. Suitable methods of volcanic reservoir logging evaluation for this area have been summarized.
    Lithology identification: Because there are various minerals in volcanic rocks, i.e. the lothology is complicated, starting with petrophysical study like rock mineral analysis, through deep analysis of logging evaluation mechanism, four methods have been defined to identify lithology of volcanics, which are relation of K2O content and GR, M-N crossplot, ΦCNL and Rt crossplot, and ΦCNL, ρb, Δt and GR crossplot. Particularly, according to the relation of K2O content and GR, it is established to quantitatively identify basalt and trachyte by gamma ray curve. This method is precise and effective. ΦCNL and Rt crossplot is firstly used to qualitatively classify the alteration degree of volcanic rocks, i.e. unaltered or slightly altered Class I, medium altered Class II, strongly altered Class III, and pelitic Class IV. Reservoirs developed in volcanic rocks of Class II and III alteration, thus providing basis for reservoir evaluation.
    Reservoir identification: On the basis of accurate division of lithology, it is determined that trachyte is an effective reservoir rock. Based on analysis of the relation between oil property and physical property of core and production test data, the corresponding relation of logging information and reservoir characteristics is established. It is determined that quantitatively and qualitatively identify reservoir by Rt- Δt,ρh- Δ t and Rt-Φ CNL logging crossplot. Combining with conventional logging and core data, factors affecting image logging are studied and analyzed, and the mode of identifying true and false fractures by acoustic and electric image logging has been established. Conformance rate of reservoir interpretation has been improved by combining quantitative and qualitative identification by 3700 logging series and with the assistant of visual reservoir image logging.
    Determination of reservoir parameters: By analyzing mineral composition and using logging crossplot technique, Δ t, ρ b and Φ CNL value of volcanic matrix has been determined, and it is determined to calculate
    
    
    matrix porosity by A t. Through theoretical study, processing interpretation and application, it has been established to calculate fracture porosity by acoustic and electric image logging, thus solved the problem of porosity determining in reserve calculation.
    Reservoir classification and evaluation: According to classification of core capillary curves and data of production test, it has been first established to classify volcanic reservoirs by R,- A t crossplot. This method combines acoustic and electri
引文
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