RELATIONSHIP BETWEEN THE MESOZOIC AND CENOZOIC TECTONIC STRESS FIELDS AND THE HYDROCARBON ACCUMULATION IN THE ORDOS BASIN
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摘要: 在前人研究的基础上,通过大量野外、井下节理、断层和褶皱观测以及构造形成序列确定,开展了鄂尔多斯盆地中新生代构造应力场研究,并分析了构造应力场与油气聚集的关系。鄂尔多斯盆地印支期主压应力场主要呈NW—SE向、NNE—SSW向和SN向,控制了古生界油气的第一次运聚与成藏;燕山期主压应力场主要呈NW—SE向,盆地西南缘呈NE—SW向,控制了古生界油气的第二次运聚与成藏;喜马拉雅期主压应力场主要呈NNE—SSW向,该时期为油气运聚调整和最终就位期。Abstract: On the basis of previous achievements,through the observation of a great deal of joints,faults and folds in field and under well and the classification of formation sequences of structures,it is studied in this paper the Mesozoic and Cenozoic tectonic stress fields and the relationship between tectonic stress fields and hydrocarbon accumulation in the Ordos Basin.The directions of the main tectonic stress fields in the basin were NW-SE,NNE-SSW and SN which controlled the first hydrocarbon migration and accumulation during the Indosinian movement.During the Yanshanian movement,it was NW-SE which controlled the second hydrocarbon migration and accumulation.During the Himalayan movement,it was NNE-SSW which controlled the final migration,adjustment and accumulation.
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