沧县隆起中南段煤层气勘探前景浅析

Coal - bed gas exploration prospect in the mid - south section of Cangxian swell

运用国内外煤层气研究的新思路,按照煤层气地质选区评价标准,从该区含煤性、含气性和可采性三个层次展开研究。在含煤性研究中从大华北煤层对比开始,分析沧县隆起中南部煤层展布特点,并结合常规地震资料,研究地震相的变化规律,预测煤层分布;运用等温吸附曲线并结合测井资料特殊处理进行煤层含气量预测;在构造分析中,从该区基底结构研究入手,分析构造演化史对煤层气藏的形成和影响,最后计算了该区煤层气资源量,指出了煤层气勘探有利目标区。

The coal - bearing property, gas - bearing property and recoverability are studied according to the geologic evaluation standard of coal - bed gas. The study of coal - bearing property starts from Dahuabei coal seam correlation. Coal seam distribution in the mid - south section of Cangxian swell is analyzed. The distribution of coal seams is predicted through study of seismic facies. Coal - bed gas concentration is predicted by using isothermal adsorption curve and specially processed logging data. The influence of tectonic evolution history on coal - bed gas reservoir formation is analyzed through the study of basement structure. At last, the resource extent of coal - bed gas in this area is calculated , and the favorable targets of exploration are suggested.