Abstract: A special interpretation method suggested in this paper can indicate calcitic shaly sand gas formation which has the characteristics of low porosity and complex lithology and can eliminate multi-solution in log interpretation.The concept of gas-bearing formation cut-off value and the way to identify gas zones by the water saturation cut-off value in gas-bearing formation improve the efficiency and accuracy of gas finding by acombination of neutron and density log.ctual examples show that the result is satisfactory.

摘要： 针对钙泥质砂岩气层孔隙度低和岩性复杂的地质特点,提出一种中子和密度测井找气的特殊解释方法,排除了岩性变化引起的多解性;引入气层中子和密度孔隙度下限值概念,提高了中子和密度测井找气的直观性。同时,又引入气层含水饱和度下限值作验证,提高了中子和密度测井找气的准确性。应用效果表明,该法对解释钙泥质砂岩气层有良好的效果。

关键词: 测井找气, 中子孔隙度, 密度孔隙度, 测井解释, 钙泥质砂岩气层