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北部湾盆地存在凝析气、挥发油、常规油以及大量过渡类型的流体,烃类组分复杂,测井响应特征相似,给凝析油气藏的识别和评价带来了很大的困难。以测试、取样和投产分析结果为依据,利用原油密度和气油比等参数对流体进行分类。在此基础上,分别利用四孔隙度差比值和纵横波速度比等方法对凝析油气进行识别,并指出由于海上油田种种因素的限制而难以广泛应用的现实问题。为此,分析北部湾盆地凝析油气藏的分布特征和运移模式,对具有不同原油性质的生油洼陷及其油气运移区域进行分类,利用气测组分比值和改进的三角形图版,来建立区域流体性质判别的定量解释标准,判别结果通过测压点回归、井下取样、测试或PVT流体分析可得到有效验证。实际应用表明,利用上述多种方法进行综合分析和相互印证,能够有效识别凝析油气层,目前该方法已在南海西部海域各区域推广应用。
There are condensate gas, volatile oil, conventional oil and a large number of transitional fluids in the Beibu Gulf basin. The hydrocarbon components are complex and the logging response characteristics are similar, which brings great difficulties to the identification and evaluation of condensate reservoirs. Based on the results of testing, sampling and commissioning, the fluid is classified using parameters such as crude oil density and gas-oil ratio. On the basis of this, the methods of four porosity ratio and P- and S-wave velocity ratio are respectively used to identify the condensate hydrocarbon, and the practical problems that are difficult to be widely used due to the limitation of various factors in the offshore oil field are pointed out. Therefore, the distribution characteristics and migration patterns of condensate reservoirs in Beibu Gulf Basin are analyzed. Oil-source depressions and their hydrocarbon migration zones with different crude oil properties are classified. Based on the ratio of gas components and improved triangles, To establish a quantitative interpretation of the regional fluid properties of the standard interpretation, the results of the pressure measurement point regression, downhole sampling, testing or PVT fluid analysis can be validated. The practical application shows that it is possible to effectively identify condensate reservoirs by comprehensive analysis and mutual proof by using the above methods. At present, the method has been widely applied in all areas of the western South China Sea.