准噶尔盆地南缘齐古地区煤层气地质特征

依据准噶尔盆地南缘齐古地区现有的煤炭勘察资料、油气探井资料、地震资料和煤岩分析化验资料,研究了中下侏罗统西山窑组(J2x)和八道湾组(J1b)煤层分布特征、煤质特征、储层物性及含气性、成藏条件等。结果表明:准噶尔盆地南缘齐古地区侏罗系煤层层数多(6~12层)、厚度大(10~60 m)、分布稳定,煤质较好(镜质组含量>50%),演化程度较高(Ro>0.65%),煤储层物性好,吸附性能较好;煤层气成藏条件较好、资源丰富,埋深2000 m以浅煤层气总资源量约为3711.1×10^8 m^3,具有较大的勘探潜力。研究区煤层气勘探程度较低,值得作为有利的煤层气勘探靶区。

Geological characteristics of coalbed methane in Qigu area on the southern margin of Junggar Basin

Based on the existing coal prospecting data,oil and gas exploration well data,seismic data and coal rock analysis data in the Qigu area of the southern margin of Junggar Basin,this paper studies the coal bed distribution characteristics,coal quality characteristics,reservoir physical properties,gas bearing properties and reservoir forming conditions of the Xishanyao formation(J2x)and Badaowan formation(J1b)of the middle and lower Jurassic.In the southern margin of Junggar Basin,the Jurassic coal has many layers(6~12),large thickness(10~60 m)and stable distribution,coal quality is better(vitriniba conyent greater than 50%)evolved is higher(Ro>0.65%).Coalbed methane is rich in resources and has good conditions for reservoir formation.The total resources of shallow coalbed methane buried at a depth of 2000 m are about 3711.1×10^8 m^3,which has great exploration potential.The exploration degree of coalbed methane in the study area is low,which is worthy of being a favorable target area for coalbed methane exploration.