准中1区块侏罗系三工河组油气成藏主控因素分析

准中1区块侏罗系三工河组主要发育低位体系域辫状河三角洲前缘亚相和湖侵体系域的曲流河三角洲前缘亚相沉积,受盆地构造面貌控制,该区主要发育岩性圈闭。研究区主要烃源岩为中二叠统下乌尔禾组二叠系暗色泥岩,储层发育多套多类型储盖组合;走滑断层作为油源断裂,是油气垂向运移的优势通道,古构造低势区控制了油气的运移方向,有利方向上的岩性圈闭控制油气富集。准中1区块深洼区岩性圈闭具有二叠系源岩供烃、花状油源断层垂向输导、低势区岩性圈闭富集的油气成藏模式,下一步勘探应重点考虑油源断裂与古构造匹配良好的岩性圈闭发育区。

Analysis on main controlling factors of J1S hydrocarbon accumulation in Block 1 of central Junggar Basin

Braided river deha front of low high system tract and meandering river delta front of high system tract are main types of J1s layer in Block 1 of central Jungar Basin. Lithologic trap is mainly type controlled hy tectonic feature of basin. The main hychxcarhon source rock is Middle Permian dark mudstone of lower Wuerhe Formation. There are many resenoir cap combination types in Jis2. Strike-slip fauh is the important transporting passage between hydrocarbon source rock and reservoir. The migration direction of hydrocarbon is controlled by low potential area of paleostructure. The enrichment of hydrocarbon is controlled by lithologic trap in favorable direction. The hydrocarbon accumulation model of Block 1 is Permian source rock for hydrocarboi, flower oil source rock for vertical migration, low potential area lithologic trap for enrichment. It is important for next exploration to find lithologic trap area with the good matching of oil source rock and paleostructure.