Based on the sedimentation analysis, via core observation and description, and the analysis of seismic facies and electrofacies, systematic research is made to the Liaohe Oilfield Qi 3-17-5 Sedimentation Feature Research of Lianhua Reservoir Sublacustrine Fan. This research further divides the sublacustrine fan into inner fan, middle fan (petal channel, petal channel space and frontal edge of middle fan) and outer fan. Middle fan introfa-cies is quite developed in this area, with the feature of petal channel growth. The lithology is mainly performed in the different thickness of layers among thick-layer gravel bed, pebbly sand-stone and dark grey mudstone. Petrofa-ciea are mainly composed of block sandstone, mud stripe sandy conglomerate and sandy conglomerate, and has a feature of deepwater environment and sedimentation turbidity carrying.%以沉积背景分析为基础,通过岩芯观察和描述,地震相与测井相分析,对辽河油田齐3-17-5块沙三下段莲花油层湖底扇相沉积特征进行了系统研究.将湖底扇相进一步划分内扇、中扇(辫状沟道、辫状沟道间和中扇前缘)和外扇.中扇亚相在本区块极为发育,并以辫状沟道发育为特征,岩性主要表现为厚层砂砾岩、含砾砂岩与深灰色泥岩不等厚互层.岩相主要由块状砂岩相、含泥质条带砂砾岩相和含泥砾砂砾岩相组成,具有深水环境和沉积物重力流搬运的特征.
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