摘要:
吴起地区三叠系长8油层组是鄂尔多斯盆地勘探的重要层位，该油层组具有砂体厚度较大，横向连片性好，但砂岩粒度细、填隙物含量较高、胶结作用强、储层物性差的地质特征。通过对生、储、盖特征的研究表明，区内长7油层组烃源岩较为发育，具有丰富的油源条件；在低渗透背景下局部发育相对高孔、高渗的优质储层，能够为石油聚集提供场所；生、储、盖组合配置关系良好，具备发育大规模岩性油藏的石油地质条件。
Chang8 Reservoir in Yanchang Formation of Wuqi Area was an important stratum for exploration in Ordos Basin. It was characterized by thicker sand body, good lateral connection, fine granularity of sandstone, high content of packing material, strong cementation and poor physical property. The analysis of oil source, reservoir and caprock indicates that there exists rich oil source condition. Under the low permeability condition, a good reservoir with relatively high permeability and porosity is developed, by which position is provided for oil accumulation with good source, reservoir and caprock relation; it provides oil geological condition for the development of large-scale lithological reservoirs.