黄河口凹陷新近系浅水三角洲岩性油气藏成藏模式

Lithological reservoir forming patterns of Neogene shallow water delta in Huanghekou sag

通过对黄河口凹陷烃源岩生烃特征模拟,并结合晚期构造活动、浅水三角洲储集层展布特征,探讨黄河口凹陷新近系浅水三角洲岩性油气藏成藏模式.结果表明:烃源岩晚期生烃是浅层岩性砂体的成藏基础,岩性圈闭的富集受"构造-断裂-层序"三要素控制,构造背景是长期的油气运移区,构造-断裂相结合决定浅层明下段油气优势通道;断裂-层序控制岩性圈闭的有效性,断裂与砂体类型的耦合关系影响岩性砂体的油气充注能力;层序-构造控制岩性圈闭类型.BZ25-26、BZ28-34、BZ29-35及南部斜坡区是新近系岩性油气藏勘探的有利地区.

According to analysis of hydrocarbon generation,late-stage structures and depositions of shallow water delta,this paper describes lithological reservoir forming patterns of Neogene in Huanghekou sag.By studying multiple biomarkers oil-source correlation,late-stage and rapid hydrocarbon generation of source rocks is the basis of shallow reservoir.Coupling relationship of structure,fault and sequence control enrichment of lithological traps.Tectonic settings were zones of a long term oil and gas migration.Relationship structure and fault determined dominant migrating channel of hydrocarbon in Neogene.The effectiveness of lithological trap is subject to relations of fault and sequence.Contact areas of fracture and sand effect cumulative hydrocarbon in the lithological traps.BZ25-26 zone,BZ28-34 zone,BZ29-35,and southern slope area of Huanghekou sag are favorable exploration areas for lithological reservoir in Neogene.