飞雁滩油气田明下三段沉积微相研究

从岩心观察入手，综合运用地质、测井曲线及测井资料数字处理成果，详细研究了飞雁滩油气田明下三段的沉积微相类型及其平面展布特征，研究结果表明，飞雁滩油气田明下三段属曲流河沉积，可细分为河道、河道边缘、废弃河道和洪泛平原四个亚相。其中．主要发育废弃河道和洪泛平原两个亚相。这两个亚相又可进一步细分为废弃河道、废弃河道边缘、河漫滩地和河漫洼地四个微相，由构造特征及少量的试气资料分析发现，天然气主要分布于废弃河道微相中，其次是废弃河道边缘微相和河漫滩地微相，河道边缘亚相是较有利的储集相带。

SEDIMENTARY FACIES OF THE THIRD SUB-MEMBER IN THE LOWER MEMBER OF MINGHUAZHEN FORMATION AT FEIYANTAN OIL AND GAS FIELD

The types and distribution of the micro-facies of the third submember in lower member of the Minghuazhen formation in Feiyantan oil and gas field were studied by using the geological, log data and the digital processing achievements. The results show that the third sub-member in the lower member of the Minghuazhen formation belongs to meander river deposit It is further divided into 4 sub-facieses(river channel,embankment,abandoned channel and floodplain sub-facies). The abandoned channel and floodplain sub-facies can be divided into 4 micro-facieses (filling, embankment. alluvial flat and lowlying land micro-facies). The analysis of the sedimentary structure characteristics and trial gas data shows that natural gas is mainly dispersed over abandoned channel micro-facies, secondly over abandoned channel embankment micro-facies and floodplain micro-facies. The river embankment sub-facies is a favourable facies.