煤层气地球物理测井技术现状及发展趋势

Actualities and Progresses of Coalbed Methane Geophysical Logging Technologies

在煤层气勘探开发中,地球物理测井是识别煤层、分析煤层特性、评价煤层气储层的重要手段。煤层气储层具有非均质性和各向异性较强、孔隙结构复杂的特点,常规油气勘探中测井解释评价的基本模型在煤层气解释中不能直接套用,必须建立适合煤层气测井的解释方法和模型,才能对煤层气做出正确评价。通过煤层气勘探开发测井技术应用调研,对煤层气测井采集技术、解释评价技术及面临的技术难题进行了阐述,指出当前煤层气勘探开发测井技术的发展趋势。认为我国未来煤层气测井技术的发展将向成像测井技术的应用、煤心刻度测井技术的应用,井中和井间地球物理技术的结合等方向发展。

The geophysical logging technologies are important means to identify coal bed, analyze coal bed trait and evaluate the coalbed methane reservoir in the process of coalbed methane exploration and development. The conventional log interpretation and evaluation models for oil exploration can not be directly used in coalbed methane evaluation, because the coalbed methane reservoir is different from the oil reservoir in the following aspects. It has higher heterogeneity, higher anisotropy , and more complex porosity. The interpretation method and model suitable to the coalbed methane logging should be established to correctly evaluate the coalbed methane reservoir. After studying the coalbed methane exploration and development technologies in recent years, expounded are data acquisition technology, data interpretation technology in coalbed methane logs, the technology challenges we face and coalbed gas development trend. It is believed that the coalbed methane log technology in China should make progress by applying imaging logging, coal core calibration logging, and combined in-well and between-well seismic technologies.