Fault⁃Landform Double Controlled Archean Buried⁃Hill Reservoir Integrated Prediction for BZ26⁃6 Oil Field, Bohai Bay

Archean buried⁃hill reservoir in BZ26⁃6, Bohai Bay is controlled by ancient landform and faults simultaneously. In order for reservoir evaluation and reserve production, we propose a fault⁃landform double controlledArchean buried⁃hill reservoir integrated prediction method. The composition of the overlying strata above the Archean buriedhill controls the weathering degree.Via restoration of ancient landform, we achieve reservoir plane division considering the weathering degree. Near east⁃west high⁃angle faults activated in Indosinian period and the normal fault continuously activated among Indosinian, Yanshanian and Himalayan periods control the fracture development, and we exploit the Radon transform and ant tracking methods to predict the favorable area of the fracture.In final, using the prediction of the weathering degree as low⁃frequency information, and the prediction of the fracture as high⁃frequency information, we exploiting the wavelet transform method to achieve the attribute fusion. Based on the fused attribute, the reservoir is classified as type Ⅰ, type Ⅱ⁃1 and type Ⅱ⁃2. The reservoir of type Ⅰ has the best quality, both the weathering degree and fracture development are relatively well, the reservoir of type Ⅱ⁃1 and Ⅱ⁃2 have relatively good quality, either weathering degree or fracture development is relatively well. The reservoir classification is coincided with the well logs and production test data, and helps to establish the reserve production strategy. It illustrates that exploiting the main controlling factors of weathering and fracture to guide seismic reservoir prediction, and using the attribute fusion to merge the results has a certain degree of practical significance.