鄂尔多斯盆地红河油田长81油气富集主控因素研究

摘要/Abstract

摘要： 利用岩心、测井、录井、有机地球化学及试油生产资料，从烃源条件、储集条件、盖层条件、源储接触关系4个方面，分析了红河油田延长组长8₁亚油层组油气富集主控因素。研究区油藏类型以岩性油藏为主，主力烃源岩为长7底部张家滩页岩，有机质类型以I型为主，TOC为15%左右，分布范围广，为油藏形成提供了物质基础及运移动力。研究区长81储层属低孔、超低渗储层，沉积作用、成岩作用及微裂缝的改造作用共同控制储层物性，进而影响含油性。长7中上部厚层泥岩形成物性与超压封闭盖层，为油藏提供了良好的保存条件。长7底部张家滩页岩与长81储层直接大面积接触、“面状”供烃，是长81油气富集的关键。

关键词: 油气富集主控因素, 长8₁亚油层组, 红河油田, 鄂尔多斯盆地

Abstract: Based on core, wireline logging, mud logging, organic geochemical and production testing data, the main controlling factors of hydrocarbon accumulaiton in the Chang 81 reservoir of Yanchang Formation in the Honghe Oilfield were analyzed from the aspects of source rock, reservoir, cap rock and source-reservoir assemblage. The results show that lithologic oil reservoirs are dominant in the study area. The principal source rock is acted by the Zhangjiatan shale at the bottom of Chang 7 formation, where Type I organic matter is predominant with TOC of about 15%. This widely distributed source rock provides both material basis and migration dynamics for the formation of oil reservoirs. The Chang 8₁ reservoir in the study area is of low porosity and ultra-low permeability, and its physical properties are controlled jointly by sedimentation, diagenesis and micro-fracture reworking, which affect its oil-bearing potential accordingly. The thick mudstones in the mid-upper part of Chang 7 formation act as the physical and overpressure sealing cap rocks, providing good preservation conditions. The Zhangjiatan shale at the bottom of Chang 7 formation is in extensively direct contact with the Chang 8₁ reservoir, thus hydrocarbons are supplied in the shape of plane, which is the key to the hydrocarbon accumulation in the Chang 81 reservoir.

Key words: main controlling factors of hydrocarbon accumulation, Chang 8₁ reservoir, Honghe Oilfield, Ordos Basin

张颖, 张海涛. 鄂尔多斯盆地红河油田长8₁油气富集主控因素研究[J]. 中国石油勘探, 2016, 21(6): 73-80.

Zhang Ying, Zhang Haitao. Main controlling factors of hydrocarbon accumulation in Chang 8₁ Reservoir in Honghe Oilfield, Ordos Basin[J]. China Petroleum Exploration, 2016, 21(6): 73-80.

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鄂尔多斯盆地红河油田长8₁油气富集主控因素研究

Main controlling factors of hydrocarbon accumulation in Chang 8₁ Reservoir in Honghe Oilfield, Ordos Basin

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