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利用构造裂隙填图技术,在新疆阜康白杨河矿区地表围岩中实测了388个观测点,根据观测点构造裂隙的发育特征划分破碎等级,预测了地下煤储层构造裂隙的优势方向和发育特征,并利用6口煤层气井的产量数据、压裂曲线和井径扩大率进行验证。结果表明:地表围岩中观测点破碎等级较高的区块,煤储层内构造裂隙系统发育,天然裂隙联通情况良好,渗透率较高,煤层气井产量较高,压裂曲线的形态以先高后低型和波浪型为主,井径扩大率一般大于15%以上;观测点破碎等级低的区块,煤储层内构造裂隙系统发育不足或严重不足,天然裂隙联通情况较差,渗透率较低,煤层气产量为中产或低产,压裂曲线的形态为上升型,井径扩大率一般小于7%。利用该方法预测煤储层构造裂隙发育特征与工程数据吻合度较高,证明了该方法的有效性和可靠性,为有类似地质条件的煤层气开发区块煤储层裂隙系统预测,提供了一种新思路和新技术。
Using the technique of structural fracture mapping, 388 observation points were measured in the surface rock of Baiyanghe mining area in Fukang, Xinjiang. According to the developmental characteristics of the structural fractures at the observation points, the fracture grade was classified, and the predominant direction and development of structural fractures of underground coal reservoirs were predicted Characteristics, and the use of six coal-bed methane production data, fracturing curves and caliper expansion rate to verify. The results show that the blocks with high crushing level in the surrounding rock of the ground surface develop well in the structural fracture system in coal reservoirs, and the natural fracture connectivity is good with high permeability and high production of coalbed methane wells. High and low after the type and the wave type, the borehole diameter expansion rate is generally greater than 15%; observation point broken level blocks, the coal reservoir within the structural fracture system is underdeveloped or seriously inadequate, natural fracture connectivity is poor, penetration The CBM output is low or medium, and the shape of the fracturing curve is ascending. The caliper expansion rate is generally less than 7%. It is proved that the method is effective and reliable by predicting the developmental features of structural fractures of coal reservoirs in accordance with the engineering data by using this method. It provides a prediction for fracture system of coal reservoir in CBM development zone with similar geological conditions A new idea and new technology.