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海拉尔盆地复杂油水层地化录井综合评价研究
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摘要
海拉尔盆地是中国油气勘探重点区域之一,该盆地为断陷沉积,成藏条件及油水分布都极为复杂,油水层评价难度大。本论文以近年来实际应用效果突出的地化录井为核心,通过改进、完善已有的地化录井技术和重新建立新的地化录井评价技术方法,目的是为石油勘探提供先进有效的适合该区复杂油水层评价的新技术,满足生产需求。
     本论文在地化评价基础研究和资料定量化处理基础上,建立了以地化为核心,综合应用气测、荧光图像和测井资料的综合评价新技术,并将其成功地应用于油田勘探实践,取得了以下主要研究成果和创新性。
     (1)系统开展了地化色谱与储层油水响应实验及响应机理研究。研究表明,在海拉尔盆地,测井电阻率受多种因素影响,与含油性相关性较差,论证了地化参数的有效性,从理论上阐述了地化录井是海拉尔盆地最有效的解释技术。
     (2)创建了录井资料定量化处理技术。应用数学和计算机技术,建立了地化色谱量化表征和自动化处理技术;将热解、轻烃、饱和烃和气测等资料作为一个整体,应用神经网络技术,建立了地化分析烃类损失恢复校正技术。在资料处理技术研究上取得了较大突破,为定量评价奠定了基础。
     (3)丰富了解释技术手段。建立了饱和烃、轻烃参数图版,实现了地化色谱精细解释,同时,还加大了气测和荧光图像资料应用力度,完善了录井单项评价技术,在理论上和技术方法上都取得了较大的突破。
     (4)发展了复杂油水层综合评价技术。优选了储层流体和产能评价的关键参数,完善了综合评价图版,形成了储层产液性质判别的核心技术;基于单井静态的石油地质储量与储层产能的内在联系,设计了应用测井录井参数评估油层产能的计算模型,发展了海拉尔盆地油层定量评价方法,实现了从定性判断向定量评价的技术跨越,形成了录井行业的替代技术。
     几年来,本论文所建立的复杂油水层地化录井综合评价技术在海拉尔盆地共应用了73口井,解释判准率达到了95.0%,为海拉尔盆地增加上亿吨的探明储量做出了重大贡献。录井资料定量化处理技术不仅较大地提高了复杂油水层精细处理解释评价技术水平,而且充分挖掘了录井资料潜力,带动了录井行业核心技术的进步。储层产能预测技术为今后的定量评价技术的研究提供了可供借鉴的方法,为储量评价参数的获取拓宽了新的研究思路,具有十分现实的意义。
Hailaer basin is one of the key regions of petroleum exploration in China. It is a faulted-depressed basin with complex reservoir forming conditions and oil-water distribution. And it is hard to evaluate oil-water layers in the basin. This paper took prominent geochemical logging effectively used practically in recent years as the core, through improving the existing geochemical logging technologies and reestablishing new geochemical logging evaluation technologies, for the purpose of providing advanced and efficient new technologies suitable for complex oil- water layer evaluation in petroleum exploration to meet production requirements.
     On the basis of basic geochemical evaluation studies and quantitative processing of data, new comprehensive evaluation technologies were established in this paper, which took geochemistry as the core and applied gas logging, fluorescence images and logging data comprehensively. And the technologies were applied in petroleum exploration practice successfully. This paper has obtained some achievements and innovations as follows.
     (1) Researches on response experiment of geochemical chromatography and oil-water in reservoir and response mechanism were carried out systematically. The results show that logging resistivity is affected by many factors and has poor correlation with oiliness. This paper demonstrated the effectiveness of geochemical parameters and theoretically expounded that geochemical logging was the most effective interpretation technology in Hailaer basin.
     (2) Quantitative processing technology of well logging data was created. Quantitative characterization of geochemical chromatography and automatic processing technology were established by use of mathematics and computer technology. Taking pyrolysis, light hydrocarbon, saturated hydrocarbon and gas logging as a whole, we set up hydrocarbon loss geochemical analysis and recovery-correction technology with neural network.
     (3) Interpretation technical means were enriched. This paper established parameter chart of saturated hydrocarbon and light hydrocarbon and realized fine interpretation of geochemical chromatography. At the same time, this paper also increased the application of fluorescence images and gas logging data, improved individual evaluation technology of well logging, and made a larger breakthrough theoretically and technically.
     (4) Comprehensive evaluation technology of complex oil-water layers was developed. This paper optimized key parameters of reservoir fluid and productivity evaluation, improved comprehensive evaluation chart and formed core technology of discrimination of reservoir produced fluid property. On the basis of internal relations between static petroleum geological reserves of single well and reservoir productivity, we designed calculation model for the evaluation of oil layer productivity by use of logging data, developed quantitative evaluation method of oil layers in Hailaer basin, realized technological leapfrogging from quantitative judgment to quantitative evaluation, and formed alternative technology in logging industry.
     In recent years, this new technology has been applied in 73 wells in Hailaer basin, whose interpretation accuracy reached 95.0%, and made a significant contribution in the increasing of over a hundred million tons of proved reserves in Hailaer basin. Quantitative processing technology of well logging data established in this paper not only greatly improved the level of fine processing and interpretation evaluation skill of complex oil-water layers, but also fully tapped the potential of logging data and led the progress of core technology in logging industry. Reservoir productivity forecast technology with a very practical significance which established in this paper provided reference approach for future research on quantitative evaluation technology and broadened new research ideas for obtaining reservoir evaluation parameters.
引文
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