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贵州上二叠统煤系气资源潜力及勘探开发对策

Resource potential and exploration and development countermeasures of Upper Permian coal measures gas in Guizhou Province

  • 摘要: 基于近年来贵州煤层气资源评价成果及煤系气勘探研究认识,结合有关游离气预测理论模型,预测了贵州上二叠统龙潭组煤系气资源潜力,分析了贵州煤系气产业发展的有利条件与挑战,提出了煤系气勘探开发技术发展方向和建议。结果表明:全省6个主要煤田龙潭组煤系气资源总量6.12万亿m3,平均资源丰度可达2.24亿m3/km2,其中91%的资源集中在六盘水、织纳、黔北三大煤田,根据区域地质条件和前期试采效果,建议六盘水煤田浅部与深部勘查并重,织纳煤田以浅部勘查为主,黔北煤田重点向深部突破。将贵州省65个重点构造单元按照煤系气资源规模和富集程度划分为四类九型,其中,大型−极高丰度构造单元19个,中型−极高丰度构造单元4个,大型−高丰度构造单元5个,大型−较高丰度构造单元10个,并对比分析了不同构造单元的资源富集差异与有利勘查方向。从资源可靠性、地质认识程度、先导探索成效3个方面分析了贵州煤系气产业发展的有利条件,但当前仍面临资源有效动用率较低、工艺技术适配性不足、新区新层系探索不够等问题挑战,建议分阶段突破浅部优质煤层煤层气新井精细高效开发与低效老井改造、煤矿区井上井下联合高效抽采瓦斯、中深部煤系气优质储层评价与勘探开发、新区新类型薄互层复合储集体煤系气勘探开发4方面关键技术,提出了“变革煤系气产业发展思路,破解目标实现掣肘困局”“注重技术进步支撑效应,多措并举扩大产业规模”等管理措施和建议。

     

    Abstract: Based on the evaluation results of coalbed methane resources in Guizhou in recent years and the understanding of coal measure gas exploration and research, combined with the theoretical model of free gas prediction, the potential of coal measure gas resources in Longtan Formation of Upper Permian in Guizhou is predicted. The favorable conditions and challenges of the development of coal measure gas industry in Guizhou are analyzed, and the development direction and suggestions of coal measure gas exploration and development technology are put forward. The results show that the total amount of coal measure gas resources in Longtan Formation of the six major coalfields in the province is 6.12 trillion m3, and the average resource abundance can reach 224 million m3 / km2. Among them, 91% of the resources are concentrated in Liupanshui, Zhina and Qianbei coalfields. According to the regional geological conditions and pre-production test results, it is suggested that Liupanshui coalfield should pay equal attention to shallow and deep exploration, Zhina coalfield should focus on shallow exploration, and Qianbei coalfield should focus on deep breakthrough. According to the scale and enrichment degree of coal measure gas resources, 65 key tectonic units in Guizhou Province are divided into four categories and nine types, including 19 large-extremely high abundance tectonic units, 4 medium-extremely high abundance tectonic units, 5 large-high abundance tectonic units and 10 large-higher abundance tectonic units. The differences of resource enrichment and favorable exploration directions of different tectonic units are compared and analyzed. This paper analyzes the favorable conditions for the development of coal measure gas industry in Guizhou from three aspects: resource reliability, geological understanding degree and pilot exploration effect. However, there are still some problems and challenges, such as low effective utilization rate of resources, insufficient adaptability of technology and insufficient exploration of new strata in the new area. It is suggested to break through the key technologies in four aspects: fine and efficient development of new coalbed methane wells in shallow high-quality coal seams and transformation of inefficient old wells, efficient gas drainage in coal mine areas, evaluation and exploration and development of high-quality reservoirs in middle and deep coal measures, and exploration and development of new types of thin interbedded composite reservoirs in new areas. The development idea of reforming coal measure gas industry is put forward. Management measures and suggestions such as “cracking the dilemma of achieving the goal ” “ focusing on the supporting effect of technological progress, and taking multiple measures to expand the scale of the industry”.

     

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