鄂尔多斯盆地英旺地区长9、长10油层组油源及成藏分析

摘要

Recently,new reservoirs have been found in Chang 9 and Chang 10 oil reservoir set of Triassic Yanchang Formation in Yingwang area,Ordos Basin.Based on source rocks characteristics,oil-source correlation and accumulation patterns,it is considered that even though the source rocks of Chang 9 oil reservoir set is a set of good source rocks,it contributed little to the hydrocarbon accumulation of Chang 9 and Chang 10 oil reservoir set.The oil in Chang 9 and Chang 10 oil reservoir set in Yingwang area are mainly from the source rocks of Chang 7 oil reservoir set in Huachi-Taibai-Zhengning-Yingwang area.Abnormal high pressures produced during the diagenetic evolution are the main force for hydrocarbon migration.Pores and fractures are the main migrating system,which allows oil to migrate vertically along fractures and inject laterally when it met sandstone.%近年来,在鄂尔多斯盆地英旺地区上三叠统延长组长9、长10油层组发现了油气藏。通过烃源岩特征分析、油-源对比、成藏特征分析等发现,英旺地区长9油层组烃源岩为一套好烃源岩,但其生成的油气可能优先侧向运移到了志丹等地区成藏,对英旺地区长9、长10油层组油气藏贡献不大。英旺地区长9、长10油层组中的油气主要来自华池—太白—正宁—英旺一带的长7油层组烃源岩。烃源岩成岩演化过程中产生的异常压力为油气运移的主要动力,孔隙和裂缝为油气运移的主要输导体系,油气沿孔隙-裂缝输导体系进行垂向-侧向运移,遇砂体即充注成藏。