利用Pr、Ph判断储集层性质的解释评价方法

The interpretation and evaluation method for determining the nature of reservoir by using Pr and Ph

在江汉油田应用饱和烃气相色谱录井技术过程中发现,准确识别储集层的含水性有一定困难,部分油水同层气相色谱谱图形态特征与油层特征十分相似,难以辨别。通过对原油组分中姥鲛烷Pr、植烷Ph判断储集层性质的理论基础的分析,鉴于Pr、Ph结构稳定,油水混相中原油不易氧化的特征,通过对饱和烃气相色谱录井,分析Pr、Ph参数、谱图形态以及其他特征,结合常规录井方法,研究储集层中不同流体的表征规律。此外,根据江汉油田潜江油层盐湖相沉积特点,建立了潜江组饱和烃气相色谱Ph值与孔隙度交会图板,应用气相色谱谱图形态特征及Ph参数进行油水层的判别。在实际应用中,取得了较好的效果,为录井油气层解释提供一个新的解决方法。目前,该方法已在多口井得到运用,效果良好。

It is found that the accurate identification of the reservoir water content has been difficult by using the logging technology of saturated hydrocarbons gas chromatography in Jianghan Oilfield.Part of the morphological features of gas chromatography spectrum of oil-water layers is very similar to that of oil layers,which is difficult to identify.By analyzing the theoretical basis of using pristane Pr and phytane Ph in the crude oil composition to determine the reservoir properties,and in view of the features that Pr and Ph structures are stable and not easy to be oxidized in crude oil of oil-water mixed phase,the authors studied the characteristic law of different fluid in reservoirs through saturated hydrocarbon gas chromatography logging parameters of Pr and Ph,spectrum morphology and other features in combination with conventional mud logging methods.In addition,according to the sedimental features of bedding salt lagoonal facies in Qianjiang reservoir of Jianghan Oilfield,the authors established the cross plot chart of Pr value obtained from saturated hydrocarbons gas chromatography and porosity for Qianjiang group and proposed to use the features of gas chromatography spectrum morphological features and Ph parameter to determine the oil-water layers.The method achieved good results in practical applications and provided a new solution for oil and gas interpretation.At present,the method has been used in many wells with good effects.