摘要
新疆地区煤层气资源量丰富,2000 m深以浅煤层气资源量高达7.51×10^(12)m^(3),约占中国煤层气资源总量的25.0%。为了进一步明确该区煤层气资源的地质特征及富集规律,以准噶尔盆地南缘硫磺沟区块中—低阶煤层为研究对象,从含气量和产能的主控要素入手,探究新疆地区中—低阶煤层气的富集特征,明确勘探思路。研究发现,在以中—低阶煤层为主的浅层勘探区域,构造复杂,煤层厚度大,目的层段煤层单层厚度大于10 m,平均孔隙度为7.3%~9.2%,平均渗透率为(2.4~2.64)×10^(-3)μm^(2),含气量差异较大(0.02~10 m^(3)/t);目的层以生物成因煤层气为主,埋深较浅,水动力强,含气量低,导致勘探开发效果不理想。研究后认为,新疆地区中—低阶煤层气的勘探要充分结合煤层气的成因类型、构造、水文地质及埋深条件,以含气量为主要参考指标,选择构造相对较稳定、位于弱径流-滞留区并且煤层气成因为混合成因、热成因的区域,是勘探取得成效的关键。
The shallow coalbed methane resources above 2000 m in Xinjiang reach 7.51×10^(12)m^(3),accounting for approximately 25.0%of the total coalbed methane resources in the China.In order to further clarify the geological characteristics and enrichment rules of coalbed methane resources in this area,taking the mid-to-low-rank coal seams in the Liuhuanggou block on the southern margin of the Junggar Basin as the research object,a comprehensive geological analysis of preliminary exploration data was carried out to further deepen the mid-to-low-rank coal seams in Xinjiang.The enrichment characteristics of coalbed methane clarify exploration ideas.This study has obtained the following three understandings and achievements:In the shallow exploration area dominated by medium-low rank coal seams,the structure is complex and the coal seam thickness is large.The single layer thickness of the coal seam in the target interval is greater than 10 m,the average porosity is 7.3~9.2%,and the average permeability is 2.4~2.64 mD.The gas content is quite different,ranging from 0.02 to 10.00 m^(3)/t.The target layer is mainly biogenic coalbed methane,with shallow buried depth,strong hydrodynamic action,low gas content,as a result of unsatisfactory exploration and development.In the next step,the exploration of medium-low-rank coalbed methane in Xinjiang should fully combine the genetic type,structure,hydrogeology and burial depth conditions of coalbed methane,take gas content as the main reference index,and select relatively stable structures located in weak runoff-retention areas and areas with mixed and thermal origin of coalbed methane are the key to achieving commercial results.
作者
涂志民
车延前
李小军
任毅军
常新龙
李鹏
TU Zhimin;CHE Yanqian;LI Xiaojun;REN Yijun;CHANG Xinlong;LI Peng(Coalbed Methane Company Limited,PetroChina,Beijing 100028,China)
出处
《西北大学学报(自然科学版)》
北大核心
2025年第5期1169-1180,共12页
Journal of Northwest University(Natural Science Edition)
基金
国家自然科学基金(41390451)
中国石油前瞻性基础性技术攻关项目(2021DJ2306-006)
中石油煤层气有限责任公司科学研究与技术开发项目(2022-KJ-39)。
关键词
新疆硫磺沟区块
中—低阶煤
含气量主控因素
Block of Liuhuanggou in Xinjiang
middle-low rank coal
main controlling factors of gas content
