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准南玛纳斯地区低阶煤储层特征及压裂改造效果研究
投稿时间:2018-05-09  修订日期:2018-07-30  点此下载全文
引用本文:单衍胜,袁远,张家强,毕彩芹,唐跃.2018.准南玛纳斯地区低阶煤储层特征及压裂改造效果研究[J].地质论评,64(5):1277-1284
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作者单位E-mail
单衍胜 中国地质调查局油气资源调查中心北京100083 shanger2018@sohu.com 
袁远 中国地质调查局油气资源调查中心北京100083  
张家强 中国地质调查局油气资源调查中心北京100083  
毕彩芹 中国地质调查局油气资源调查中心北京100083  
唐跃 中国地质调查局油气资源调查中心北京100083  
基金项目:本文为自然资源部中国地质调查局油气基础地质调查专项(编号:DD20160186)的成果。
中文摘要:基于中国地质调查局组织施工的2口煤层气参数井资料,分析了准噶尔盆地南缘玛纳斯地区煤储层特征,综合影响煤层气富集与开发的储层参数,优选2#、5#煤层段采用大液量、中高排量、低砂比、变粒径支撑剂、多级阶梯式加砂压裂工艺进行储层改造,并采用地面微地震监测方法评价了压裂效果。研究表明:研究区中厚煤层群发育,煤层总厚度大、层间距小,且主要为原生结构的长焰煤。煤岩显微组分以镜质组和惰质组为主,储层微观孔隙发育,且主要为组织孔和溶蚀孔。煤储层孔隙度8.8%~14.5%,比表面积0.624~9.585 m2/g,孔容较大,孔隙连通性较好,渗透率0.0012~1.9286 mD,属中高孔—中低渗型储层。区内2#、5#煤层埋深大、含气量高、储层压力与能量高,但压裂施工中注入压力高、加砂效率低,储层改造难度较大。微地震监测结果显示,压裂所产生的人工裂缝以垂直缝为主,呈SE—NW展布,裂缝长度、宽度及影响体积都较大。压后放溢流时,放喷口气体可点燃,初步显示研究区具有良好的产气潜力。
中文关键词:玛纳斯  低煤阶  煤层气  储层特征  压裂改造
 
Low-rank CBM Reservoir Characteristics and Effects of Fracturing Reconstruction in the Manas Area, Southern Junggar Basin
NameInstitution
SHAN YanshengOil and Gas Survey Center, China Geological Survey Bureau, Beijing, 100083
YUAN YuanOil and Gas Survey Center, China Geological Survey Bureau, Beijing, 100083
ZHANG JiaqiangOil and Gas Survey Center, China Geological Survey Bureau, Beijing, 100083
BI CaiqinOil and Gas Survey Center, China Geological Survey Bureau, Beijing, 100083
TANG YueOil and Gas Survey Center, China Geological Survey Bureau, Beijing, 100083
Abstract:Objectives: The resource condition of low rand coalbed methane resources in Manas mining is superior. However, the degree of geological research and resource evaluation is extremely low, which restricted the exploration and development of coalbed methane in the area. The purpose of this study is to analyze the characteristics of the low order coal reservoirs, and to discuss the reformability and effect of coal reservoirs Hydraulic fracturing, in order to provide theoretical and engineering reference for the exploration and development of coal bed methane in the area. Methods:By two coalbed methane (CBM) parameter wells drilling and Core sample testing, Comprehensive analyzed the reservoir parameters which influence the enrichment and development of CBM, 2# and 5# coal seams were optimized for reservoir reconstruction Meanwhile, the micro seismic monitoring method was used to evaluate the fracturing effect. Results:The thickness and depth of coal seam in the Manas area is 1.9~9.5 m and 800~1500 m, Ro.max between 0.50% and 0.85%. gas content of air dried basis is 0.89~6.43 m3/t. The coal reservoir porosity is in the range of 8.8%~14.5% with the specific surface area is 0.624~9.585 m2/g. The pore has a large volume and good pore connectivity, with the permeability between 0.0012 mD to 1.9286 mD. Coal reservoir pressure rangs from 12.21 MPa to 15.18 MPa, break pressure rangs from 19.60 MPa to 23.76 MPa, which are beneficial to the enrichment and fracturing of coalbed methane. The reservoir reconstruction of 2# and 5# coal seam transformed fracture with a single wing length of 90.5~142.2 m,width of 39.8~48.0 m, volume of 22.74×10 4~27.37×10 4 m 3, and effectively improved coal reservoir connectivity and permeability.Conclusions: The Medium—thick coal seam groups are developed in Manas area, with a large total thickness, a raw structure and mainly a kind of long flame coal. The microscopic pores of the reservoir are developed, which are mainly tissue pores and dissolution pores. The pore has a large volume, good pore connectivity, and medium—low permeability.The 2# and 5# coal seams in the study area have a large buried depth, a high gas content, a high reservoir pressure and formation energy. However, during the fracturing, the injection pressure is high and the sand adding efficiency is low which reflect the difficulty of reservoir reconstruction. The micro seismic monitoring results show that the artificial fractures produced by fracturing are mainly vertical fractures, showing SE—NW striking, and the length, width and volume of the fractures are all relatively large. When the flood discharge is released after fracturing, the discharge gas can be ignited, which shows a good gas production potential in the study area.
keywords:southern Junggar basin, manas, low rank coalbed methane, reservoir characteristics, fracturing reconstruction
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