准噶尔盆地南缘深部优质储集层及有利勘探领域

The Deep and Relatively High-Quality Clastic Reservoir Bodies and Favorable Exploration Areas in Southern Margin of Junggar Basin

准噶尔盆地南缘深部碎屑岩优质储集层岩性主要为滨岸及三角洲前缘环境沉积的不等粒、中-细粒及极细粒砂岩,具有成分成熟度及结构成熟度较高、杂基含量低、成岩演化程度较低、固结较弱、储集性能较好的特点,深部碎屑岩相对优质储集层形成主要与高能沉积环境、长期处于碱性成岩环境、早期长期浅埋-后期快速深埋、异常高压、早期胶结-后期溶蚀等因素有关。南缘第二、第三排构造带为重要的勘探领域,新近纪、古近纪、白垩纪及晚侏罗世,沿古湖岸线的滨岸及三角洲前缘的高能环境沉积的有利的储集体是南缘深部重要的勘探目标。

The deep and relatively high-quality clastic reservoir rocks in southern margin of Junggar basin are dominated by anisometric sandstone, medium-fine grained sandstone and very fine grained sandstone deposited in shore and delta front,with characteristics of high compositional and structural maturity, low matrix content, low diagenetic evolution degree, weak cementation and preferable reservoir quality. They are related to the high-energy depositional environment, long-term basic diagenesis, the early long-term burying - the late short-term deep burying, abnormal high pressure and the early cement-the late solution. It is concluded that the structural zones of the second and the third rows could be important areas for exploration in southern margin of Junggar basin. The advantaged reservoir bodies deposited in the high-energy envirojnment of lakeshore and delta front of Paleogene, Neogene, Cretaceous and Lower Jurassic are major targets of petroleum exploration in deep areas of the southern margin.