长岭凹陷沉积微相对岩性油气藏的控制作用——以腰英台地区青山口组为例

摘要

The integration of cores and well logs shows that the lacustrine and delta deposits are widely developed in the Qingshankou Formation in the Yaoyingtai region, Changling depression, southern Songliao Basin. The lacustrine facies consists of littoral and shallow lacustrine subfacies composed of mud beach, mixed beach and sandy beach bar microfacies. The delta facies is built up of delta plain subfacies and delta front subfacies. The delta plain subfacies may be subdivided into distributary channel and interdistributary bay microfacies, whereas the delta front subfacies include subaqueous distributary channel, subaqueous interdistributary bay, channel mouth bar, sheet sands and distal bar microfacies. The channel mouth bar, subaqueous distributary channel and beach bar sandstones are considered as the key areas due to good reservoir potential and hydrocarbon potential. The sedimentary microfacies cited above have significant controls on the distribution of the lithologic oil pools in the study area. The prolific zones are represented by the mobile belts of the lake strandline.%岩心、录井和测井资料分析表明:松辽盆地南部长岭凹陷腰英台地区青山口组发育湖泊相和三角洲相沉积,湖泊相由滨浅湖亚相组成,可识别出泥滩、混合滩、砂质滩坝微相；三角洲相由三角洲平原亚相和三角洲前缘亚相组成,三角洲平原亚相可识别出分流河道、分流间湾微相；三角洲前缘亚相可识别出水下分流河道,水下分流间湾,河口坝,席状砂,远沙坝微相.不同类型微相不仅控制了本区岩相变化特征、砂体展布特征和砂体的储集性能,而且对砂体的含油气性也有明显的控制作用.河口坝,水下分流河道和滩坝砂体在储集性能和含油气性方面更具优越性,从而成为勘探开发的重点.沉积微相的展布对本区岩性油气藏分布具有明显的控制作用,湖岸线的活动带为岩性油气藏的富集带.