气测录井影响因素及校正

以自动连续检测钻井液中所含气体的成分和含量为目的的气测录井是早期发现油气层的重要手段之一。通过在录井过程中对气测录井检测分析手段以及钻井过程中一些尚不可控因素的分析,阐述了影响气测录井发现和评价油气层准确性的两大类主要因素,它们分别为地质因素和非地质因素。针对非地质因素中的钻井工程参数和井筒压差的影响,依次探讨了全烃地面含气量校正指数方法和井筒压差影响的校正方法。数据对比表明,校正后的气测参数值更能反映地层的油气显示,参数变化曲线更明显,有利于提高气测录井资料的应用价值。

The influencing factors and correction methods for mud logging

The gas logging is one of the important means of first discovering oil-gas layers which automatically and continuously detects the gas composition and content contained in the drilling fluid.For some uncontrollable factors existed in gas logging detection and analysis means and drilling during mud logging,the paper analyzed and set forth two kinds of the main factors,that is,geological factors and non-geological factors.Combining with factor analysis,the paper delved further into total hydrocarbon ground gas content correction index method and correction method for wellbore pressure difference in accordance with the effects of drilling engineering parameters and wellbore pressure difference.The data comparison shows that the corrected data can better reflect stratigraphic hydrocarbon shows,the changes of parameter curves are more obvious,thus helping to improve gas logging data.