CHARACTERISTICS OF PROTOTYPE BASIN AND HYDROCARBON POTENTIAL EVALUATION OF THE LATE TRIASSIC IN THE WEST HE’NAN PROVINCE
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摘要: 晚三叠世是稳定的华北克拉通向构造活动剧烈的滨太平洋构造域过渡的时期,在南华北西部及鄂尔多斯地区沉积了巨厚的上三叠统.济-洛地区上三叠统位于大鄂尔多斯盆地东南部,属滨浅湖(油坊庄、椿树腰组)向半深湖相(谭庄组)过渡的沉积,生油岩厚度和质量较长庆地区偏薄偏差.在燕山和喜山运动中,鄂尔多斯盆地庆阳-延安地区因构造稳定,油气生成、保存条件好,形成油气富集区;济源-洛阳地区则因构造活动剧烈,上三叠统在许多地方剥缺,早期油气藏遭受严重破坏.Abstract: Thick stratum was deposited in the west part of southern North China and the Ordos area during the Late Triassic,when the stable North China Craton turned into circum-Pacific tectonic tract.The Upper Triassic of Jiyuan-Luoyang area located in the south-east Ordos basin,with sedimentary facies ranging from lakeshore/shallow lake subfacies (Youfangzhuang,Chunshuyao formations)to bythyal lacustrine facies (Tanzhuang formation),and the source rock thickness and quality were not as good as those in the Ordos basin.During the Yanshan and Himalayan epoch,the Qingyang-Yan'an area of Ordos basin was relatively stable,which was an oil-rich zone with good condition of oil formation and preservation,while the Upper Triassic in Jiyuan-Luoyang area was eroded in the tremendous tectonic movement,and the earlier pool was destroyed.
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