收稿日期: 2010-10-31
修回日期: 2010-11-15
网络出版日期: 2010-12-10
基金资助
国家科技重大专项“鄂尔多斯盆地大型天然气田富集规律、目标评价与勘探配套技术”(编号2008ZX05007-005）资助
Effect of Structural Evolution on the Formation and Distribution of Upper Paleozoic Giant Gas Fields in the East Ordos Basin
Received date: 2010-10-31
Revised date: 2010-11-15
Online published: 2010-12-10
构造演化研究表明，鄂尔多斯盆地东部上古生界自中生代以来的构造演化大体经历了中三叠世平缓构造发育、晚三叠世—早白垩世古隆起发育和现今斜坡形成3个阶段。其中晚三叠世—早白垩世的上古生界古隆起可能形成于晚三叠世印支运动，加强于侏罗纪燕山早期运动，弱化于早白垩世末的燕山晚期运动，改造于新生代的喜马拉雅运动。该古隆起由于与石炭系—二叠系烃源岩的生气、排气高峰期匹配很好，因而成为当时天然气运移聚集的最有利区，已发现的榆林大气田和大牛地大气田即位于该古隆起部位，说明成藏关键时期古隆起背景的存在对鄂尔多斯盆地上古生界大气田的形成具有一定控制作用，但现今构造面貌对气藏分布基本上不起控制作用。气藏类型研究表明，鄂尔多斯盆地上古生界气藏为致密砂岩连续型非常规气藏，具有广覆式生烃、“蒸发式”排烃、近距离运移、大面积成藏的特点，古隆起区是这种连续型气藏的一个重要“甜点”区。连续型致密砂岩气藏的确认，预示着鄂尔多斯盆地拥有更丰富的天然气资源和更广阔的天然气勘探前景。
赵靖舟, 王力, 孙兵华, 白玉彬, 吴伟涛 . 鄂尔多斯盆地东部构造演化对上古生界大气田形成的控制作用[J]. 天然气地球科学, 2010 , 21(6) : 875 -881 . DOI: 10.11764/j.issn.1672-1926.2010.06.875
Upper Paleozoic structure in the east part of Ordos basin as a large smooth westward monocline was characterized by simple structure short of folds and faults.Accumulation and distribution of natural gas in the upper Paleozoic in Yulin area was mainly controlled by sedimentary facies,and the types of gas reservoir were regarded as lithologic type.Nevertheless,the structural evolution suggested that the Yulin region has experienced 3 structural stages,i.e.level structure in middle Triassic,paleo\|uplift in late Triassic to early Cretaceous,and monoclinal slope in late Cretaceous to present.The paleo-uplift of upper Paleozoic was probably formed through the Indosinian movement in late Triassic,intensified by the early Yanshanian movement in the end of early Cretaceous and reformed by the Himalayan movement in the Cenozoic.The formation and development of this paleo-uplift coincided with time of peak generation and expulsion of hydrocarbons from Carboniferous and Permian source rocks.Thus,the paleo\|uplift became the most favorable area for natural gas accumulation.The giant gas fields of Yulin and Daniudi were distributed at paleo\|uplift and its surroundings,inferring that the formation and occurrence of giant gas fields would be controlled by the paleo\|uplift.But the present local structures have little or even no effect on the distribution of the giant fields.On the contrary,we found out that the Upper Paleozoic natural gas fields in the Ordos Basin would be continuous tight gas accumulations,which are characterized by widespread hydrocarbon generation,vaporizing\|like expulsion,short-distance migration and pervasive distribution.Recognition of continuous tight gas accumulation in the Ordos basin may give a greater resource volume and a bigger exploration potential in this basin.
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