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鄂尔多斯盆地富县探区位于陕北斜坡,通过对该探区上古生界天然气初次运移的历史、动力、方向和二次运移方向的研究,认为该区上古生界在晚侏罗世—早白垩世开始大量生成天然气,为排烃的高峰期,初次运移的动力除扩散作用外,主要是气源岩所产生的异常压力,方向垂直向下,即指向奥陶系风化壳;天然气的二次运移方向主要是北东向,但由于地层倾角较小,横向进行二次运移的动力不足以及受储集层物性差和砂体展布方向等方面的制约,天然气只能在较短的范围内运移。富县探区是鄂尔多斯盆地上古生界天然气成藏的最佳地区。图6参8
Based on the history, motive force, direction and secondary migration direction of the first migration of natural gas in the Upper Paleozoic of the exploration area, the Fuxian exploration area of Ordos Basin is located in the northern slope of northern Shaanxi. It is considered that the Upper Paleozoic in the area was characterized by Late Jurassic- In the early Cretaceous period, natural gas was largely formed. For the first stage of hydrocarbon expulsion, the motive force of the initial migration was mainly the abnormal pressure generated by the gas source rocks, and the direction was vertical downward, pointing to the Ordovician weathering crust. Natural gas Of the secondary migration is mainly in the NE direction. However, due to the small dip angle of the strata and the insufficient power for the secondary migration in the horizontal direction, and due to the poor physical properties of the reservoir and the distribution direction of the sand body, Shorter range of migration. Fuxian exploration area is the best area for gas accumulation in Upper Paleozoic Ordos Basin. Figure 6 Reference 8