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The Paleocene reservoir of Dagang Oilfield, which is one of the most important and complex faultcontrolled lacustrine reservoirs in China, is located in the north depression of Bohai Basin. With forty years of exploration and development, most large oilfields in East China have generally entered the high water-cut stage. The original deep water lacustrine reservoirs in Dagang Oilfield have, however, experienced significant tectonic and diagenesis throughout its long geological history. These processes have greatly complicated the reservoir properties. Therefore, the fault-controlled deep water lacustrine reservoirs have become a new field of reservoir geology study in China, which is very important in getting a proper knowledge of remaining oil distribution and improving oil recovery rate. Based on core observation and sedimentary facies analysis, reservoir characteristics of lower Es1 in T34 Block and the main geological factors influencing its physical properties are systematically studied by using a large number of rock thin sections, thin sections, porosity and permeability properties and mercury-injection data etc .It is held that the lower Es1reservoir belongs to mid to low porosity, low to extra-low permeability and fine throat reservoir. Reservoir properties of study area are dominated by diagenesis, and combination of sandstone and mudstone. Among them, carbonate cement, silica cement and clay mineral transformation are the main causes of the poor physical properties, while the corrosion produces substantial secondary porosity and provides favorable reservoir space. Authigenic kaolinite is the dissoluted product of feldspar and debris. Reservoir properties of vertical distribution are controlled by combination of sandstone and shale. Keywords-reservoir property; controlling factors; lower member 1 of Shahejie Formation; T34 Block; Huanghua Depression

Sedimentary Characteristics, Origin and Model of Lacustrine Deepwater Gravity Flow Channels