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#br#应用定量颗粒荧光技术研究宝岛13-1气田油气成藏特征

Keywords: 琼东南盆地,宝岛13-1,定量颗粒荧光,成藏期

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Abstract:

?琼东南盆地宝岛北坡宝岛13-1气田天然气(含油)丰度低,低丰度油气藏的原因目前仍不明确。通过尝试应用定量颗粒荧光技术(qgf和qgf-e)研究宝岛13-1气田低丰度油气藏的成因及成藏特征。结果表明:宝岛13-1区梅山组—三亚组储层qgf指数很低、qgf-e强度很高,而位于同一构造带南部下倾方向的宝岛19-2区陵水组储层qgf指数很高、qgf-e强度却很低;这反映了宝岛13-1区梅山组—三亚组储层中油气聚集时间很晚,油气充注时间晚造成了颗粒内包裹体丰度非常低,颗粒表面吸附烃类相对较高;而宝岛19-2区陵水组成藏时间相对较早,从而使储层砂岩颗粒内形成了较多的烃类包裹体;综合其他成藏条件分析认为宝岛13-1区油气主要来自本地深部烃源岩的贡献,而不是来自生烃条件相对较好的宝岛凹陷,远距离和供烃不足是其油气低丰度的主要原因。?

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