鄂尔多斯盆地彬长区块延长组生储盖组合与油气富集特征

通过地球化学分析及岩心观察、测井、录井与试油等资料，分析了鄂尔多斯盆地彬长区块延长组生 储盖组合及油气富集特征。 结果表明：研究区以长 7 油层组底部张家滩页岩为主力烃源岩，以长 8 - 长 6 油层组三角洲前缘水下分流河道及重力流砂体为储层，以长 9 -长 4+5 油层组间隔发育的半深湖- 深湖相暗色泥岩及页岩为盖层，构成了 4 套生储盖组合：长 7 生-长 9₁ 储-长 9 上部盖（Ⅰ）、长 7 生-长 8₁ 储-长 7 盖（Ⅱ）、长 7 生-长 7₂ 储-长 7 上部盖（Ⅲ）和长 7 生-长 6₃ 储-长 6 ₁₊₂ -长 4+5 盖（Ⅵ）。 根据 源-储配置关系及生储盖层叠置样式将生储盖组合划分为连续型（Ⅱ和Ⅲ）和间断型（Ⅰ和Ⅵ）共 2 类 4 套，其中连续型生储盖组合油气富集主要受控于张家滩页岩与有利储层展布和断层-裂缝系统发育程度； 间断型生储盖组合油气富集主要受控于油源断裂、源-储距离和有利储层展布。 连续型生储盖组合油气 充注与保存条件均较好，比间断型生储盖组合油气富集程度更高。

Characteristics of source-reservoir-caprock assemblage and hydrocarbon accumulation of Yanchang Formation in Binchang block,Ordos Basin

Based on the data of geochemistry, cores, logs and oil test, this paper analyzed the characteristics of sourcereservoir-caprock assemblage and hydrocarbon accumulation of Yanchang Formation in Binchang block, Ordos Basin. The result shows that the Zhangjiatan shale at the bottom of Chang 7 oil reservoir is hydrocarbon source rock of Yanchang Formation in Binchang block. The sand bodies of delta front underwater distributary channel and gravity flow in Chang 8 to Chang 6 oil reservoir set act as reservoir. The dark mudstone of semi deep-deep lake facies in Chang 9 to Chang 4+5 oil reservoir set act as caprock. Four sets of source-reservoir-caprock assemblages were divided: （1） Chang 7 as source, Chang 9₁ as reservoir and upper Chang 9 as caprock; （2） Chang 7 as source, Chang 8₁ as reservoir and Chang 7 as caprock; （3） Chang 7 as source, Chang 7₂ as reservoir and upper Chang 7 as caprock; （4） Chang 7 as source, Chang 6₃ as reservoir and Chang 6-Chang 4 as caprock. According to the configuration relationship between source and reservoir and the stacking patterns of source, reservoir and cap, the source-reservoir-caprock assemblage can be divided into successive type （2 and 3） and discontinuous type （1 and 4）. The successive type of assemblage is controlled by the distribution of Zhangjiatan shale, reservoirs quality and the development degree of fault-fracture system. The discontinuous type of assemblage is controlled by the oil source, faults, the distance between source and reservoir as well as the distribution of favorable reservoirs. Successive type of assemblage has advantages in hydrocarbon injection, seal quality and higher oil saturation compared to discontinuous type assemblage.