摘要
本文以洒西盆地为例,着重讨论了变形盆地沉积相中的几个问题:1.原始沉积厚度的恢复;2.盆地内部原地系统和外来系统沉积体系的区别;3.盆地原始沉积边界的恢复。最后指出,这类盆地油气二次勘探的主要方向是生储油层系被掩覆的前缘推覆带和盆地内部该层系重叠的地带。
Abstract
Take western Jiuquan Basin in northwest China as an example, it is proposed in this paper that the basin undergone strong tectonism is termed "deformedbasin". In order to study sedimentary facies of the basin, following problems should be paid attention: 1.Guidish's relationship between deposition rate and age are used to calculate erosion thickness so as to reconvert the initial configuration in vertical. 2.According to the discordant relationship of strata thickness and deposition system in each portion of the basin, the autochthonous system and the allochthonous system are distinguished in plane. 3.The primary boundary of the basin is roughly reconverted in accordance with Johnnes Walther's phase rule, Sternberg's low, geometry or depression and isopach strike of sedimentary stratum. Finally, it is pointed out that the place where source and reservoir bedswere overlaped and superimposed are new areas for oil and gas prospecting inthe deformed basin.
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