鄂尔多斯盆地陕北周长区致密砂岩油藏成藏主控因素研究  

Research on Main Controlling Factors of Tight Sandstone Reservoir Formation in the Zhouchang Area of Northern Shaanxi,Ordos Basin

作　　者：王耀 高胜利 王翀峘 杜善龙 WANG Yao;GAO Sheng-li;WANG Chong-huan;DU Shan-long(Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《河北地质大学学报》2021年第5期56-63,共8页Journal of Hebei Geo University

基　　金：陕西省自然科学基础研究计划一般项目(面上)(2019JM-359)。

摘　　要：致密油是非常规油气的重要组成部分,也是石油勘探的重点。虽然周长区长9、长8、长7致密油资源丰富,但其高效的开发受到人们对于层位认识不足的制约。通过沉积相分析、储层特征、油藏分类研究,探索致密砂岩油藏成藏的主控因素,确定了周长区上生下储、下生上储型生储盖组合的成藏模式。研究认为本区油藏受多因素控制,除了具备有利的烃源岩条件外,油藏分布受沉积相带和砂岩厚度控制明显,储层物性对成藏贡献有限,叠置砂体和大量裂缝的存在为周长区油气的运移提供了主要的通道,成岩作用和鼻隆状构造都是油气成藏的有利条件。Tight oil is an important component of unconventional oil and gas,and it is also the focus of petroleum exploration.Although the Chang 9,Chang 8,and Chang 7 tight oil resources in the Zhouchang area are rich,their efficient development is restricted by people's insufficient understanding of the strata.Through sedimentary facies analysis,reservoir characteristics,and reservoir classification research,the main controlling factors of tight sandstone reservoir formation were explored,and the accumulation model of source-reservoir-cap combination of upper generation and lower reservoir and lower generation and upper reservoir in the Zhouchang area was determined.The study believes that the reservoirs in this area are controlled by multiple factors.In addition to favorable source rock conditions,the distribution of the reservoirs is significantly controlled by sedimentary facies belts and sandstone thickness.The physical properties of the reservoirs have limited contribution to accumulation,with overlapping sand bodies and a large number of fractures.The existence of diagenesis and rhinoplasty provide the main channel for the migration of oil and gas in the perimeter area.Both diagenesis and rhinoplasty are favorable conditions for oil and gas accumulation.

关 键 词：致密砂岩 周长区 沉积相 油藏分类 成藏主控因素 

分 类 号：TE122[石油与天然气工程—油气勘探]