CO_2气综合勘探技术及实例分析

Integrated exploration techniques for CO_2 and analysis on case history

CO2气藏由于其物理、化学性质的特殊性,CO2气勘探与烃类气既有相同又有区别,综合应用多种资料和多种技术方法是勘探CO2气(层)藏的有效手段。通过运用色谱测量法和红外线CO2气体浓度测量法实现CO2气层钻井现场动态检测,利用气体色谱检测、相关录井参数资料、核测井密度中子孔隙度差值综合解释CO2气层,有效地区分烃类气和CO2气,分析地震亮点、AVO特征和地表化探异常与CO2气藏的关系,运用地震亮点、AVO、叠后滤波处理、约束反演技术和地球化学识别技术,有效地识别和预测CO2气分布。总结形成了CO2气藏的录井、测井、地震和地球化学综合勘探技术方法,该项技术在花沟地区CO2气藏的勘探中取得了很好应用效果。

There are some has some similarities and differences between the CO2 and the hydrocarbon exploration as the CO2 pool has some particular physical and chemical properties, it is an effective means to explore the CO2 pool by using multi-data and multi-techniques. CO2 formations are detected dynamically on drilling site by color spectrum measurement and infrared ray CO2 concentration measurement. The CO2 formation are interpreted comprehensively, the CO2 is distinguished from the hydrocarbon, seismic bright point and AVO characteristic are analyzed, and the relation between the surface chemical exploration abnormal and the CO2 pool is found out by gas color spectrum detection, relative well logging parameter data and nuclear log density neutron porosity differences. The CO2 identification and prediction can be done by seismic bright point, AVO, poststack illtering, constrained inversion and geochemistry integrated exploration. The well logging, seismic and chemical integrated exploration techniques for CO2 are developed, and a good resuit has been obtained in the application in CO2 formation ex- ploration in Huagou area.