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常规测井资料识别天然气主要依据三孔隙度测井曲线,常用的方法有密度-中子曲线重叠法等。但是密度测井受井眼状况的影响较大,在井眼条件较差的储层段采用密度-中子曲线重叠法不能有效地指示天然气的存在。同时,有些油层也会出现曲线相交。针对这些问题,作者提出了孔隙度曲线重叠法的一种改进方法—视油层中子孔隙度测井法。本文利用油层受井眼状况影响较小的声波时差曲线拟合一条孔隙度曲线与中子孔隙度曲线重叠进行气层识别解释,有效地克服了以上两个不利因素,并且通过在印尼RIPAH油田测井资料的实际应用中证实,该法能高效的进行油气的识别解释工作。
Conventional logging data to identify natural gas is mainly based on three-porosity logging curve, commonly used methods are density - neutron curve overlap method. However, density logging is greatly affected by wellbore conditions. Density-neutron curve overlap method is not effective in indicating the presence of natural gas in reservoir sections with poor wellbore conditions. At the same time, some of the reservoirs also have curves that intersect. In response to these problems, the authors propose an improved method for the overlap of porosity curves - the oil-bearing neutron porosity logging method. In this paper, we use the acoustic jet lag, which has little influence on the wellbore condition, to fit a porosity curve and overlap the neutron porosity curve to explain the gas zone, which effectively overcome the above two unfavorable factors. The actual application of well data confirms that this method can efficiently identify and interpret hydrocarbons.