Coarse sand in the Yellow River mainly comes from sand rock area, Inner Mongolia, water erosion, wind erosion and gravitational erosion occur interactively in this area.
内蒙古砒砂岩地区是黄河重要的粗沙来源区，该地区具有水蚀、风蚀及重力侵蚀交互的特点。
The existence of vast area of tight sand rock, low permeability of sand rock and plenteous gas supply are all favorable conditions for the formation of deep basin gas traps.
大面积致密砂岩的存在、砂岩的低渗透性以及充足的天然气供应都是形成深盆气藏的有利条件。
The plentiful hydrocarbon rock in study area is the material foundation of the lithologic deposit, meanwhile channel sand offers reservoir space for hydrocarbon enrichment.
综合分析认为，研究区丰富的烃源岩为岩性油藏的形成提供大量的物质基础、河道砂坝砂体是油气富集的重要场所；
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