古油层和残余油层的定量颗粒荧光响应

利用定量颗粒荧光(QGF和QGF-E)技术研究了古油层和残余油层的定量颗粒荧光响应。结果表明，古油层与现今油层具有很强的QGF荧光响应，利用QGF荧光响应识别出TZ421井存在100 m古油层，表明早期油气充注规模大，但后期发生泄漏，导致油水界面上升到现今的3 620 m。利用QGF-E荧光响应识别出60m残余油层，说明发生多期古油层泄漏，第一期泄漏使油水界面上升到残余油水界面(3 680 m)，第二期泄漏发生在近期，形成现今油水界面。现今凝析气层中的强QGF荧光响应表明凝析气顶形成于最后一期天然气充注。

Quantitative Grain Fluorescence Responds to Residual Oil Zones and Paleo-Oil Zones

In order to investigate quantitative grain fluorescence responding to residual oil zones and palaeo-oil zones, samples from sandstone reservoirs in well TZ421 in Tazhong area, Tarim Basin, NW China, were used to carry out quantitative grain fluorescence (QGF and QGF-E) measurement and analysis. A palaeo-oil zone can be delineated in well TZ421 between 3 720 and 3 620 m with strong QGF responds. A residual oil zone was discovered in well TZ421 between 3 680 and 3 620 m with strong QGF-E responds. The presence of a residual oil zone and a palaeo-oil zone in well TZ421 below the current oil-water contact indicates that some oils were lost after the initial charge. The reservoir is believed to have been charged initially down to 3 720 m at the depth of the palaeo-oil-water contact. The presence of a 60 m residual oil zone below the current oil-water contact, as delineated by QGF-E, suggests that the palaeo-oil zones leaked in two epochs and part of the oil lost quite recently. The strong QGF responds in the current condensate gas interval indicates that the initially charged oil was partly displaced by gas and formed an oil zone with a gas cap.