常规气测录井综合气体指数解释法的建立及其在油气储层解释中的应用

The Establishment of Comprehensive Gas Index Interpretation Process for Conventional Gas Logging and Its Application in Oil and Gas Reservoir Interpretation

摘要: 常规气测录井是发现油气显示，评价储层含油气性的重要方法，不同类型油气藏气测值的特征不同，通过对上述特征的总结分析可以区分油气藏类型。综合气体指数法(COGASIN, Comprehensive Gas Index)，是利用C1~C5组分体积分数计算得到评价指数，绘制指数曲线和三元图来区分油气藏类型的方法。对原生油气藏可以明晰地判断储层流体性质，结合气测录井定量参数全烃数据，可以达到解释储层性质的目的。提出了综合气体指数法的计算方法，对不同类型油气藏的综合气体指数曲线和三元图特征进行分析总结，并初步形成了基于轻烃比值指数反映油藏特征的技术方法。

Abstract: The conventional gas logging was an important method to find oil and gas show and to evaluate the oil-bearing property of the reservoir. The gas logging data of different types of oil and gas reservoirs had different characteristics, so the summarized characteristics of oil and gas reservoir could be used for classifying the types of reservoirs. The Comprehensive Gas Index (COGASIN) method was a series of evaluation indices calculated from the C1 - C5 components in conventional gas logging data, which was a new method for distinguishing the reservoir types by plotting index curve and 3-element graph. This method can identify fluid property clearly in the primary reservoir, and combined with the quantitative parameters of gas logging total hydrocarbon data, reservoir interpretation can be carried out. This paper introduces the computing method of comprehensive gas index, and the characteristics of integrated gas index 3-element graph and curve from the gas logging data of different types of oil and gas reservoirs are analyzed. A technical method based on the ratio index of light hydrocarbon is preliminarily created to reflect reservoir characteristics.