论文部分内容阅读
研究表明,鄂尔多斯盆地姬塬地区延长组低渗致密砂岩发育多种类型的油气输导系统,主要有裂缝简单型、裂缝-砂体复合型、裂缝-不整合面复合型和砂体简单型等4种,其中裂缝型输导系统是整个延长组中上部油气垂向运移的优势通道;裂缝-砂体复合型输导系统是长6～长2油层组中砂岩透镜体岩性圈闭和储层物性封闭岩性圈闭的主要运移通道;裂缝-不整合面复合型输导系统是不整合地层圈闭的主要运移通道;砂体型输导系统是延安组和直罗组常规储层中发育的低幅背斜和上倾尖灭岩性圈闭的主要油气运移通道,提出了延长组低渗透致密砂岩油气运聚具有多点充注、“补丁式”拼接、无重力分异的特征。该次研究为鄂尔多斯盆地中生界石油勘探提供了有益参考。
The results show that there are many types of oil and gas transmission systems in the Yanchang Formation low-permeability tight sandstone in the Jiyuan area, Ordos Basin. They are mainly simple fracture type, fracture-sand complex type, fracture-unconformity complex type and sand body simple type Among them, the fracture-type conductivity system is the dominant channel for the vertical migration of the upper part of the oil and gas in the whole extension group. The composite fracture-sandstone system is the lithologic trap of sandstone lenses in the Chang 6 to Chang 2 oil-bearing formation Reservoir physical property closed the main migration channel of lithologic traps; the fracture-unconformity composite system is the main migration path of unconformity stratigraphic traps; the sand body type guide system is the normal storage Low-anticline and updip pinch-out lithologic traps, the paper proposes that multi-point filling and “patch-type” splicing of the low-permeability tight sandstone in the Yanchang Formation should be carried out. The characteristics of gravity differentiation. The study provides a useful reference for the exploration of Mesozoic petroleum in the Ordos Basin.