欢喜岭油田南部坡洼过渡带沙一、二段隐蔽油气藏预测

应用层序地层学理论,利用岩心、测井、录井等资料,建立了欢喜岭油田南部坡洼过渡带沙一、二段的高分辨率层序地层格架,将其划分为2个长期旋回、8个中期旋回和20个短期旋回。在此基础之上对各中期旋回的砂体、沉积相展布规律进行了分析,并根据层序、沉积发育特征预测了隐蔽油气藏有利发育区带,认为锦128以南架岭6以东及双203、锦110和锦310井之间为隐蔽油气藏勘探的有利地区。同时结合研究区的断裂与砂体发育特征,得出本区断裂下降盘构造岩性油气藏和低水位时期的砂岩尖灭油气藏应为隐蔽油气藏勘探的重点对象。

Prediction of subtle reservoir in the first and the second members of Shahejie formation in the southern transition zone, Huanxiling oilfield

According to the theory of sequence stratigraphy,and on the basis of data of core,well logging and borehole logging, it is set up the high-resolution sequence stratigraphic framework at the study area,in which can be divided into 2 long-term stratigraphic cycles,8 intermediate-term cycles and 20 short-term cycles.It is also analyzed the distribution of sand bodies and the sedimentary facies of each intermediate -term stratigraphic cycle.Based on the characteristics of strata sequence and sedimentary,the favorable subtle reservoirs are predicted.It is suggested that subtle reservoirs are favorable in the south of Well J128,the east of Well Jialing6 and among Well S203,Well J110 and Well J310.On the connection with the study on the characteristics of fault and sand body,i the result shows that the exploration targets should focus on the structural--lithological reservoirs in the thrown side of fault and the sand pinchout reservoirs during the period of lowstand systems tract (LST).