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大庆徐家围子地区深层火成岩气藏测井解释方法研究
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摘要
火成岩油气藏已经成为复杂岩性油气藏的重点勘探目标。本文依托中国石油股份有限公司科技与信息管理部超前研发、应用基础类研究课题《复杂岩性测井处理解释》(2003-2007),在前人研究的基础上,采用地质学、测井学、计算机学、岩石物理学等多学科的理论和方法,以常规测井技术和测井新技术为基础,以计算机技术为手段,综合利用岩心实验、地质、测井、试油、录井、气测等信息,研究出一套适用于深层火成岩天然气储层的测井评价方法,并在实际生产中得到了验证,使得这套火成岩天然气储层的测井评价方法成为理论基础扎实而且实用性强的一套理论和方法。
     本文在对比多口井火成岩地层测井响应的基础上,系统分析了大庆深层火成岩地层的测井响应规律,总结出了研究区火成岩地层的电性测井响应特征、声学响应特征、放射性测井响应特征、成像测井的结构和构造特征等。
     系统分析了ECS测井在大庆深层火成岩气藏的响应特征,依据国际上通用的岩性地质命名原则,建立了利用ECS测井识别火成岩岩性和确定骨架参数的模型,形成了利用ECS测井识别火成岩岩性的处理流程,经过和斯伦贝谢公司的处理结果对比,其效果较好。利用ECS逐点变骨架的思想,采用中子-密度交会计算岩石的孔隙度,编制处理模块,利用138个岩心样品分析点做验证,其平均绝对误差在1.5%以内。
     针对研究区深层火成岩岩性复杂,相带变化复杂,储层类型复杂,储层物性普遍较差,属特低孔渗型储层,储层非均质性很强,无统一气水界面,测井解释难度大等特点,利用非均质条件下饱和度方程的一般形式,根据全直径岩心实验所确定的适合于研究区目的层的饱和度方程的最佳形式,形成了大庆深层火成岩储层的饱和度处理流程,通过对储层流体性质的判别方法进行了深入研究,建立了多参数流体识别图版,编制了相应的测井处理模块,并挂接到测井解释平台CifSun 2005上。通过研究区52口井的实际资料处理,解释结论经过和75个试油层位的试油结果对比,符合率在85%以上,验证了该方法在研究区的可靠性和实用性,并且该方法可以在其它地区的火成岩储层推广应用。
Reservoir in igneous lithology characters has become the focus of exploration targets of complex lithologic reservoir. This paper bases on the advanced study and basic applied subject (explanation of log in complex lithologic rocks)of China National Petroleum Corporation technology and R & D Information Management Department. With the helps of previous research it adopt the method and theory of geology, logging, computer science, petrophysics, basing on normal and new technology of logging. Computer technology as a means of experiments is used to comprehensive core geology, logging, testing, logging, gas and other information. At last, it develops a logging appraisal is suit for deep igneous reservoir and practice. This makes logging igneous gas reservoir evaluation method is firm theory as a theory and the practical side and Act.
     In this paper, in contrast to respond well logging on the basis of igneous rock formation, analysis of the deep igneous stratigraphy Logging Response of Daqing, sums up the study of igneous rock formation electric log responses, the acoustic response characteristics of radioactive log responses, imaging logging on the structure and tectonic features.
     Response characteristics of ECS Logging in Daqing deep igneous gas reservoir are analyzed, According to international nomenclature used in the geological rock, the model of igneous rocks to identify lithology and rock framework parameters by ECS logging is established, and the process of recognizing igneous rocks is formed. The result is better contrast to Schlumberger. Basing on changing skeleton value by point change, using neutron-density method calculates porosity. 138 core samples analyzed by point, the average absolute error is 1.5%.
     In view of the study area some features of deep igneous rock, such as complex lithology, complex facies changes , the complex reservoir, the low porosity and permeability reservoirs, reservoir heterogeneity sense, the absence of a unified air-water interface, log interpretation difficult and so on, using non-homogeneous equation for the general form of saturated conditions, according to the entire diameter cores, the best form of saturation equations is established in the study area. Daqing igneous rock process is formed. Discriminating reservoir fluid nature carried out in-depth studies, a multi-parameter fluid identification chart is established. the corresponding log processing module is used on CifSun 2005 of the platform of log interpretation. 52 wells in the study area by the actual data processing, interpretation and conclusion after 75 spaces in the Layer Test results, the rate is more than 85%. the reliability and usefulness of the method in the study area is good. The method can be applied in other regions to promote the igneous reservoir.
引文
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