准噶尔盆地不同类型天然气有利聚集区、带划分

DIVIDING THE DISTRICTS BEING FAVOURABLE TO THE ACCUMULATION OF VARIOUS TYPES OF NATURAL GAS IN ZHUNGEER BASIN

准噶尔盆地为我国大型含油气盆地之一，面积１３万ｋｍ２，晚古生代以来陆相沉积地层发育齐全，并有多套烃源岩，区域上表现为“三坳五隆”的构造格局。根据盆地坳（凹）陷类型和各类烃源岩热演化程度、气的类型以及各层系不同类型天然气的生成、运移、聚集等基本地质特征，将盆地划分出不同类型的天然气有利聚集区３个、气聚集带９个。这些区、带是：①北天山山前坳陷侏罗系煤型气和煤层气聚集区，包括齐古背斜型气聚集带、腹部斜坡区煤型气聚集带和东部煤层气聚集带；②玛湖凹陷二叠系油型气和煤型气聚集区，包括单料带油型气聚集带、中拐鼻隆煤型气聚集带和坳中隆油型裂解气聚集带；③盆─陆凹陷二叠系油型气聚集区，“包括达巴松凸起油型气聚集带、陆南凸起油型气聚集带和马桥凸起油型裂解气聚集带。这些划分对该区天然气勘探具有一定指导意义。

zhungeer basin, with 1 3 × 104km2 of area, is a large one of oil-gas bearing basins in China. The terrestrial formations with several setS of source rocks have developed completely since Late Palaeozoicera. The structural pattern of 'three depression sand five uplifts' appears in region. Based on the types of the depression (sag) in the Basin, the thermal evolution degree of various Source rocks, the gas types and the seological properties of gas forming, migration and accumulation of each series of strata, 3 districts and 9 belts being favourable to the accumulation of various types of gas are divided in the Basin. They are that: ①the coal-type-gas and coal-bed-gas accumulation district of Jurassic in piedmont depression of North Tianshan, including the accumulation belt of Qigu anticline gas,the coal-type-gas accumulation belt of abdomen slope region and the coal-bed-gas accumulation belt in east part;②the oil-type-gas and coal-type-gas accumulation district of Permian in Muhu Sag, including the oil-type-gas accumulationbelt of monoclinic region, the coal-type-gas accumulation belt of Zhongguai nose uplift and the oil-type cracking gasaccumulation belt of Aazhong uplift;③the oil-type-gas accumulation district of permian in basinwland sag, includingthe oil-type-gas accumulation belt of Dabasong arch, the oil-type-gas accumulation belt of Lunan arch and the oiltype cracking gas accumulation belt of Maqiao arch.