通过对富县–甘泉地区延长组长6~长9油层组油气成藏条件分析认为，区内长7和长9油层组的烃源岩相对较好；长7、长8油层组砂体整体上呈北西–南东向展布，为低孔–特低渗储层；长7油层组烃源岩与长7、长8油层组储层直接接触，源储大面积相邻分布，整体上形成了紧密接触的“三明治”式结构，离烃源岩越近的层位，含油饱和度相对越高。运移阻力主要为毛细管阻力，主要动力为过剩压力。研究区长7~长9油层组过剩压力的平面分布特征表明，研究区西北部，过剩压力较大，向东部呈现出逐渐减小的趋势。
The analysis of hydrocarbon accumulation conditions of Chang 6~Change 9 Reservoirs in Fux-ian-Ganquan Area indicated that in the area the source rocks of Chang 7 and Change 9 Reservoirs were relatively higher; the sands in Change 9 Reservoir in Fuxian-Ganquan Area indicated that in the area ,the source rock of Chang 7 and Change 8 Reservoirs were totally distributed from NW to SE, which belonged to low porosity and extra-low porosity reservoirs. The source rocks in Chang 7 Reservoir directly contacted with Change 7 and Change 8 Reservoirs. The large area of the source reserves was adjacent to the reservoir, and the “sandwich” source reservoir in close contact with the source rock was formed on the whole. The closer the source rocks were, the higher the oil saturation was. The migration resistance was mainly capillary resistance and the main dynamic force was excess pressure. The distribution of the excess pressure in the Chang 7~Chang 9 Reservoirs shows that the excess pressure in the north-west of the study area is larger and it has the trend of gradual decreasing to the east.
