准噶尔盆地东北缘深层煤层气勘探前景

Exploration prospect of deep coalbed methane in the northeastern margin of Junggar Basin

准噶尔盆地东北缘地处陆梁隆起北部至乌伦古坳陷,侏罗系西山窑组和八道湾组煤层厚度大、分布较广,埋藏2000 m以深。准东地区白家海凸起彩探1H井西山窑组深层煤层气试获工业气流后,拓宽了准东北缘煤层气勘探新领域。综合分析区内多口探井勘探和试气资料,发现煤层在地震剖面上连续强反射、测井响应明显、录井气测异常突出、含气性好,认为准噶尔盆地东北缘具有较好的深层煤层气勘探前景。提出准北1井区、陆6井区和乌参1井区西山窑组,伦5井区八道湾组为深层煤层气勘探有利区。建议开展煤样取心工作、开展煤岩地球化学特征和岩性、物性、电性、含气性等“四性”关系分析,为区内深层煤层气勘探提供科学依据。

The northeastern margin of Junggar Basin is located from the northern Lüliang Uplift to Wulungu Depression.The coal seams of Jurassic Xishanyao Formation and Badaowan Formation in this area are thick and widely distributed,buried to a depth of 2000 m.The deep coalbed methane in Xishanyao Formation of Well Caitan 1H in Baijiahai Uplift,the eastern Juggar Basin,has been tested for industrial gas flow,which broadens the new field of deep coalbed methane exploration in the northeastern margin of Junggar Basin.On the seismic profile,coal seams are characterized by continuous strong reflection,obvious logging response,prominent logging gas logging anomaly,and good gas bearing property.It is proposed that Xishanyao Formation in Zhunbei1,Lu6 and Wushen1 well areas and Badaowan Formation in Lun5 well area are favorable area for deep coalbed methane exploration.It is suggested to carry out coring work of coal seam,analyze the geochemical characteristics of coal seam and the“four properties”relationship of litholofy,physical property,electrical property and gas bearing property,and provide scientific basis for deep coalbed methane exploration in this area.