西峰油田长_8油组沉积相与油气分布规律

SEDIMENTARY FACIES AND HYDROCARBON DISTRIBUTION LAW IN CHANG 8 RESERVOIRS,XIFENG OILFIELD

通过详细的岩芯观察及测井曲线分析,认为西峰油田长8油层为河控湖相三角洲前缘沉积。据沉积层序特征,可将该区三角洲前缘砂体划分为水下分流河道、河口砂坝、远砂坝3种砂体微相。在沉积微相垂向和平面沉积特征分析基础上,建立了相应的沉积模式,并对沉积时期的气候、地形等因素进行了分析。研究表明,水下分流河道砂体和河口砂坝砂体叠合形成的指状砂坝砂体是研究区最具特色砂体类型,而指状砂坝砂体、水下分流河道砂体及河口砂坝砂体共同构成了研究区内的主要油气储集体,研究成果为储集相带的预测及下一步的勘探奠定了基础。

Sedimentary facies of the Chang 8 reservoirs,Xifeng Oilfield is interpreted jointly with sedimentary structure,characters of sedimentary sequence and logging data.The main sedimentary microfacies of Chang 8 reservoirs include distributary channel,channel mouth bar and front sand sheet.The finger-bar sandbody is made up of distributary channel and channel mouth bar.The features of sedimentary microfacies are influenced by many factors including climate and terrain and so on.The finger-bar sandbody is the peculiar sandbody morphology in the study area.The finger-bar sandbody,distributary channel sandbody and distributary mouthbar sandbody constitute the main reservoirs in the area.The study result provides the foundation for prediction of favorable reservoir facies belts and next exploration.