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对鄂尔多斯盆地姬塬地区延长组长4+5油层组近100个致密砂岩岩屑样品进行定量颗粒荧光(QGF/QGF-E)技术分析,结果表明,长4+5油层组致密砂岩的QGF-Index(颗粒荧光指数)和QGF-E(颗粒抽提物荧光指数)数值相对较低,且QGF-Index值和QGF-E值两者匹配关系复杂,显示低渗透致密砂岩薄互层成藏差异性明显;储层中低渗透致密砂泥岩薄互层油气微观运聚充注机理分为4类:排烃高峰期充分充注型,排烃高峰期欠充注型,排烃高峰期后充注型,未充注型。定量颗粒荧光技术是发现低渗透致密砂岩薄互层中含油层段的有效手段。
Quantitative Particle Fluorescence (QGF / QGF-E) analysis of nearly 100 tight sandstone samples from the Chang 4 + 5 reservoir group in the Yanchang Formation in the Jiyuan area of the Ordos Basin shows that QGF- Index and QGF-E (particle extract fluorescence index) are relatively low, and the matching relationship between QGF-Index and QGF-E values is complex, indicating that there is a difference in the formation of thin interbedded layers of low permeability and tight sandstone The results show that there are four types of mechanisms for the micro-transport and charge-filling of thin interbedded reservoirs with low permeability and tight sandstone and mudstone, such as fully charged hydrocarbon peak expiration, undercharged peak hydrocarbon expulsion, Note type, not filling type. Quantitative Particle Fluorescence (FGA) is an effective method to find oil-bearing intervals in thin interbeds of low-permeability and tight sandstone.