摘要
基于3口煤层气参数井实钻资料及煤岩样品测试数据,分析了六盘水地区杨梅树向斜煤层气地质特征,重新估算了区内煤层气地质资源量,优选了5个有利目标层段,并对杨煤参1井3个有利层段开展了分压合采试验,获得了良好的产气效果。研究表明:区内上二叠统龙潭组薄—中厚煤层群发育,可采煤层累积厚度大且以原生结构为主,煤层含气量、含气饱和度及临储比高,平均渗透率达0.229×10~(-3)μm~2,煤层气富集与开发条件好。结合参数井实测煤层含气性,重新估算区内煤层气地质资源量为365.97×10~8 m~3,可采资源量为208.64×10~8 m~3。综合影响煤层气富集与开发的各项关键参数,认为5~#、7~#、13~#、15~#、23~#为区内煤层气勘探开发有利层段。依据产层优质性与相近性组合原则,优选杨煤参1井5~#、7~#和13~#煤进行分压合采试验,煤层气井排采过程中套压显现早,压降漏斗扩展迅速,未表现出明显的层间干扰,充分发挥了多煤层合采的资源优势,获得了最高日产气量4 656m~3/d、稳定日产气量3 600m~3/d的良好产气效果,创西南地区煤层气直井单井日产气量和稳定产气量新高,实现了区域煤层气勘查重大突破。
Based on the drilling data and coal petrographic test data of three coalbed methane parameter wells,we analyzed the coalbed methane geological characteristic,re-estimated the coalbed methane geological resource and optimized five favorable target intervals of Yangmeishu syncline in Liupanshui area.Simultaneously,the separate pressure production test was performed in the three favorable intervals of Well Yangmeican 1,and finally the productive gas production effect was achieved.The results show that thin and medium-thickness coal seam groups in Longtan Formation of Upper Permian are developed in this area,the recoverable coal seams are dominated by primary structure and possess large accumulation thickness;the gas content,gas saturation and relative reservoir ratio are high enough,the average permeability is 0.229×10~(-3)μm~2,the condition of coalbed methane accumulation and development is favorable.Combined with the key parameters of coalbed methane enrichment and exploitation,5~#,7~#,13~#,15~# and 23~# are regarded as favorable intervals of coalbed methane exploration and development in this area.According to the combination principle of quality and similarity in production layer,we selected 5~#,7~# and 13~# coal seams of Well Yangmeican 1 to conduct separate pressure production test.During the drainage process,the casing pressure appeared early and the pressure drawdown distribution expanded rapidly,interlayer interference did not show in this process.The resource superiority of multi-layer commingled production is fully exerted;the favorable gas production effect of 4 656 m~3/d in maximum daily output and 3 600 m~3/d in steady daily output was acquired.This outcome creates new heights of single-well daily output and stable gas production of coalbed methane vertical well in southwest area,and achieves a major breakthrough of regional coalbed methane exploration.
引文
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