Structural Characteristics And Favorable Reservoir Prediction Of Es₂ Member In N74 Area Of Liaohe Oil Field

N74 area is located in the north section of Liaohe east sag, Bohaiwan Basin. The target layer is ES2. Oil and gas has been indicated in target oil reservoie, and has obtained industrial oil and gas flow,this study is aimed at the further implement of structural characteristics of the target area and sand body distribution in order to provide the scientific basis of further search for potential reservoir.In this thesis, on the basis of sequence stratigraphy theory, combined with seismic and well logging data, we can establish sequence stratigraphic framework of the study area,and divide the ES2 layer into three sandstone group complete and 17 small layer. Using high-precision three-dimensional seismic data to synthetic seismograms to achieve track horizon for the whole region; Combined time slice with coherence techniques to interpretation fault and combination of plane and profile, and studied the structural features of the area;According to logging data,eatablishing high accuracy variable velocity field and finishing time-depth conversion to draw structure maps of the top and bottom boundary of main target layers. Finally, through the constrained sparse pulse inversion technique,and combined with structural features of the region,we can study sand body distribution and gas distribution, forecasting future exploration favorable target area.Studies have shown that zhe whole ES2 layer is based at faulted anticline structure with “lower from north to south and slower from west to east”,the thickness and distribution of the sand body is control byt he structural shapeand sedimentary microequa. Affected by zhe provenance direction,the favorable areas are located in northern and north-eastern region,where oil and gas gathered,because of traps and faults the more developed traps and faults. Currently the main trap type of this area are fault-anticline 、fault-block、 fault-nose block, broken nose and the visible tip of lithologic reservoirs in some areas.