柴达木盆地东部“走廊域”中新生代构造特征及构造演化
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摘要
通过横穿柴达木盆地东部的“走廊域”剖面地表地质、航磁、重力、大地电磁测深和地震资料的综合分析,认为在东昆仑构造带与南祁连构造带之间,包括巴颜喀拉地块北缘,柴达木地块和祁连地块南缘等3个一级构造单元,柴达木地块内则包括了昆中构造带、昆北构造带和柴达木盆地3个二级构造单元。受东昆仑构造带和南祁连构造带相向挤压作用,柴达木盆地东部持续沉降,但由于具有稳定的花岗质基底,盆地坳陷幅度较小,且断裂及褶皱构造不发育。由此造就了柴达木盆地东部中新生代地层厚度小,烃源岩不发育,构造圈闭缺乏,除第四系天然气外,中生界、古近系和新近系油气资源前景受到极大限制。
Based on synthetical analysis of geological, aeromagnetic field, gravity, MT and seismic data of corridor section in East Qaidam basin, it shows there exists three first-order structure units between East Kunlun and Qilian orogenic belts which is the north brim of Bayinkela massif, Qaidam massif and south brim of Qilian massif. The Qaidam massif is divided into three second-order struc- ture units which is Kunzhong orogenic belt, Kunbei orogenic belt and Qaidam basin. By the inter- compress and ramp to the basin by East Kunlun and Qilian orogenic belts, which made the basin sub- sides continuously. Because of the stable granitic bottom in the east of Qaidam basin, which made not only the subsidence range small, but also folds and faults undeveloped in the basin. This caused thin- ner in stratigraphic thickenss, undeveloped of oil source rock,and lack of structure ramps. Besides gas in Quaternary, there lack of petroleum potentiality in Jurassic, Paleogene and Neogene in East Qaidam basin.
Based on synthetical analysis of geological, aeromagnetic field, gravity, MT and seismic data of corridor section in East Qaidam basin, it shows there exists three first-order structure units between East Kunlun and Qilian orogenic belts which is the north brim of Bayinkela massif, Qaidam massif and south brim of Qilian massif. The Qaidam massif is divided into three second-order struc- ture units which is Kunzhong orogenic belt, Kunbei orogenic belt and Qaidam basin. By the inter- compress and ramp to the basin by East Kunlun and Qilian orogenic belts, which made the basin sub- sides continuously. Because of the stable granitic bottom in the east of Qaidam basin, which made not only the subsidence range small, but also folds and faults undeveloped in the basin. This caused thin- ner in stratigraphic thickenss, undeveloped of oil source rock,and lack of structure ramps. Besides gas in Quaternary, there lack of petroleum potentiality in Jurassic, Paleogene and Neogene in East Qaidam basin.
引文
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[5]夏文臣,张宁,袁小平,等.柴达木侏罗系的构造层序及前陆盆地演化[J].石油与天然气地质,1998,19(3):173-180.
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