磨溪-高石梯地区龙王庙组古油藏成藏特征

为了确定磨溪-高石梯地区古油藏的分布范围,并进一步认识其流体性质及规模,文中利用储层定量颗粒荧光、全息扫描荧光技术,结合显微激光拉曼分析等手段,对该地区寒武系龙王庙组古油藏进行了深入剖析。磨溪-高石梯地区储层段龙王庙组沥青发育,定量荧光分析结果显示,各井储层颗粒定量荧光都存在相对的高值,半峰宽普遍较低,TSF光谱最常用的参数总体表现为低值,激光拉曼光谱显示出了沥青的特征。研究表明:该地区存在一定规模的古油藏,古油藏总体表现为正常油—轻质油,现今残余沥青成熟度较高,古油层主要以层状分布,多发生原位裂解,与现今气藏有较好的匹配关系。

Characteristics of paleo-oil reservoir of Longwangmiao Formation in Moxi-Gaoshiti Area

In order to determine the paleo-oil reservoir's distribution range in Moxi-Gaoshiti Area and to have a further understanding of the fluid properties and scale of paleo-oil reservoir,the quantitative fluorescence technique,total scanning fluorescence,and the Raman spectroscopy methods are used to analyze the paleo-oil reservoir of Cambrian Longwangmiao Formation in Moxi-Gaoshiti Area.The Longwangmiao Formation reservoir developed bitumen.The results of quantitative fluorescence techniques show relatively high value of QGF index of each well,wide half-peak width,and generally low λ and R1;laser Raman spectroscopy shows the characteristics of bitumen.Researches show that it has certain scale paleo-oil reservoir in this area and the paleo-oil reservoir is of normal oil and light oil;now with the higher residual bitumen maturity,paleo-oil reservoir is mainly of stratiform and tends to occur in situ cracking,it has good matching relationship with the current gas reservoir.