准噶尔盆地南缘油气资源潜力和富集规律

准噶尔盆地南缘蕴藏着丰富的油气资源,南缘山前凹陷中、下侏罗统煤系地层为主要烃源岩,下第三系安集海河组和下白垩统是又一套重要烃源岩,与侏罗系烃源岩构成复合烃源区。根据烃源岩性质和热演化特点,预测南缘东侧呼图壁—玛纳斯一带为气态烃富集区;南缘西侧安集海—独山子一带为液态烃富集区。总结南缘油气具有生烃的多源性、运移的多期性和成藏的复杂性;天然气具有显著的垂向运移效应;断层对油气藏的形成具有重要的控制作用;安集海河组区域盖层之下是油气富集的重要场所;第二、三排构造是形成大中油气田的主要领域。

Oil and Gas Resource Potential and Abundance Law on Southern Periphery of Junggar Basin.

Oil and gas resources are very rich on the southernperiphery of Junggar Basin. The Middle, Lower Jurassiccoal stratum in the depression on the soathern peripheryis the main hydrocarbon source rock. Paleogene Anjihai-he Fm. and Lower Cretaceous are another important setof hydrocarbon source rock, which constitutes a com-pound hydrocarbon source area with the Jurassic hydro-carbon source rock. Based on the properties of hydrocar-bon source rock and the features of heat evolution, it isestimated that Hutubi-Manasi zone in the eastern part ofthe southern periphery area is a hydrocarbon abundancezone in the gas state and Anjihai-Dushanzi zone in thewestern part of the southern periphery area is a hydro-carbon abundance zone in the liquid state. Based onmultiple sources, multiple stages in migration and com-plexity of reservoir formation in the southern periphery,natural gas migraed in an obvious vertical way. Faultsplayed an important role in controlling formation of oiland gas reservoir.Oil and gas abundance zone is locatedunder the cap layer of the Anjihaihe Fm.. The second andthrid arrays of structure are the main areas for generationof large and medium-size oil and gas fields.