准噶尔盆地大油气田形成条件和预测（庆祝克拉玛依油田勘探开发40周年）

准噶尔盆地为典型的中央地块型复合叠加盆地。多旋回的构造形成多样的构造组合和沉积体系，控制着油气的生成、运移和聚集。有机地化研究表明，盆地发育６套烃源岩，主要源岩为二叠系，次为中、下侏罗统，油气沿断层垂向运移十分显著，大多数油气藏的形成与油气垂向运移相关。准噶尔盆地大油气田形成条件和分布规律表明，充足的油气资源、良好的圈闭条件、有利的油气运移指向、畅通的运移通道、稳定的保存环境和有效的盖层、优质的储层体是形成大油气田的重要地质因素，缺一不可。预测陆南斜坡带、西北缘斜坡带、阜东斜坡带及玛湖背斜、达巴松凸起等坳中隆起带和盆地南缘为形成大油气田的有利区带。

FORMED CONDITIONSAND FORE-CASTING OF GIANT OIL AND GAS JUNGGAR BASIN

Junggarbasin is a typical central massif type composite superpositionbasi,in which multiple cycle structure formed various structure combination and sedi-mentary system and controlled oil and gas generation, migration and accumulation.Thestudies on organic geochemistry showed that there are six spts of oil source rocks withinthe basin,major one is in Permian , the next in Middle and Lower Jurassic, Verticle mi-gration of oil and gas along faults is remarkable and formation of most reservoirs is relatedwith this fact. Formed conditions and distribution regulars of large oilfields indicated thatsufficient oil and gas resources, better traps , favourable oil and gas migration direction,u-nimpeded migration pathway, stable preservation environment,effective caprock,andhigh quality reservoir body are important geological factors,not a singlcone can be omit-ted. It is forecasted that favourable area are Lunan slope zone,northwest margin slopezone, Fudong slope zone , Mahu anticline,Dabasong arch and south margin of Junggarbasin.