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冻融循环对多年冻土区石油迁移影响试验研究 被引量:6
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作者 张鹏 李春城 +2 位作者 李国玉 王学力 王飞 《冰川冻土》 CSCD 北大核心 2016年第5期1325-1331,共7页
多年冻土区石油污染物迁移过程和特点、污染定量评价、防治和治理措施研发,都是目前寒区经济发展和能源开发迫切需要解决的重要课题.通过室内试验对土体温度场分布、水分分布和石油总量分布的监测分析,研究了冻融循环作用对迁移过程的... 多年冻土区石油污染物迁移过程和特点、污染定量评价、防治和治理措施研发,都是目前寒区经济发展和能源开发迫切需要解决的重要课题.通过室内试验对土体温度场分布、水分分布和石油总量分布的监测分析,研究了冻融循环作用对迁移过程的影响机制.试验结果表明,冻融循环作用通过影响石油污染物本身的物理性质、土颗粒对石油污染物的吸附作用和土体内水相的分布和相状态,影响了石油污染物的迁移过程.原油黏度随温度的降低逐渐增加,使得原油在土体中的迁移能力降低.冻融循环是油水迁移的主要驱动力之一,随着冻融循环的增加,石油污染物和水分向上迁移并聚集,石油随土样高度增加逐渐减小,而水分随高度增加而增加且在一定的位置聚集.研究成果可为多年冻土区石油污染迁移过程和定量评价及防治治理提供重要基础和参考. 展开更多
关键词 多年冻土 石油污染物 中俄原油管道 冻融循环 石油迁移
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多年冻土区石油污染物迁移过程试验研究 被引量:10
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作者 李国玉 马巍 +2 位作者 穆彦虎 李兴柏 毛云程 《岩土力学》 EI CAS CSCD 北大核心 2011年第S1期83-89,共7页
中俄原油管道原油泄漏造成的环境污染和环境岩土工程问题是目前迫切需要解决的重要问题。通过淋滤作用下的石油污染物迁移过程室内模拟试验,研究了石油污染物在冻土区的迁移过程和迁移特征,研究发现:石油污染物在迁移过程中,油、水、气... 中俄原油管道原油泄漏造成的环境污染和环境岩土工程问题是目前迫切需要解决的重要问题。通过淋滤作用下的石油污染物迁移过程室内模拟试验,研究了石油污染物在冻土区的迁移过程和迁移特征,研究发现:石油污染物在迁移过程中,油、水、气三相流体存在一个动态的平衡过程,其三者共同占据土样中的孔隙空间;石油污染物在冻土区迁移主要经历3个过程:吸附、迁移和聚集;石油污染物在迁移过程中,其各个成分和各烃类化合物迁移能力都有所不同,烃类化合物中碳数和烃类结构影响其迁移速度;冻土层对石油污染物的迁移具有明显的阻碍作用,可有效防治土壤深层次污染。研究成果为冻土区石油污染物多相流(油、水、气)水热质迁移动力学模型的建立以及石油污染引起的岩土工程特性变化等研究奠定了重要的基础。 展开更多
关键词 土力学 中俄原油管道 多年冻土 冻融 水分迁移 石油迁移
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Discovery of “Enveloping Surface of Oil and Gas Overpressure Migration” in the Songliao Basin and its bearings on hydrocarbon migration and accumulation mechanisms 被引量:6
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作者 FENG ZhiQiang ZHANG Shun FENG ZiHui 《Science China Earth Sciences》 SCIE EI CAS 2012年第12期2005-2017,共13页
The Fuyang oil layer of the Songliao Basin is a tight and low-permeability sandstone pay zone formed in the fluvial-shallow water delta environment.In the formation are mainly lithologic reservoir and tight reservoir.... The Fuyang oil layer of the Songliao Basin is a tight and low-permeability sandstone pay zone formed in the fluvial-shallow water delta environment.In the formation are mainly lithologic reservoir and tight reservoir.The lacustrine-mudstone of K2qn1 is a good source rock and also acts as a good regional cap rock.The Fuyang oil layer is a typical upper-source and lower-reservoir pattern distributed in a large area.Based on a large number of exploration and development data, a macroscopic enveloping surface is found developed in the Fuyang oil layer, which is below K2qn1.The effective reservoirs within the enveloping surface are commonly saturated with oil, and below the enveloping surface are mainly water layers.The distance from the enveloping surface to the bottom of the source rock is usually 100-350 m and at most 550 m.Through the research of the distribution patterns and the physical properties of the sandbodies above or beneath the source rock, it is concluded that: 1) the enveloping surface is the boundary of the overpressure hydrocarbon migration; 2) the spacial distribution of the pressure release beds controls the direction and the distance of the overpressure hydrocarbon migration; 3) tight oil reservoirs and lenticular oil reservoirs are mainly formed inside the envelope surface, whereas, conventional reservoirs are formed outside the envelope surface as a result of the buoyancy hydrocarbon migration.The discovery of the "overpressure hydrocarbon migration enveloping surface" and the concepts of overpressure hydrocarbon migration and buoyancy hydrocarbon migration not only challenge the old notion that "hydrocarbon migrates along the faults and is distributed along fault belts" in the Fuyang oil layer of the Songliao Basin, give a new explanation to the long-distance-oil-downwards migration (hundreds of meters) and expand the exploration potential of the Fuyang oil layer, and provide a rational guidance to the exploration of syncline plays, but also better categorize tight oil/gas and conventional reservoirs in all of the key elements related to hydrocarbon migration, accumulation, reservoir characteristics and oil and gas spatial distribution. 展开更多
关键词 enveloping surface overpressure migration buoyancy migration pressure release bed tight oil and gas Songliao Basin
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