The Reservoir Prediction And Exploration Target Selection In Jiangqiao Area

Jiangqiao area locating in the middle of west slope of northern Songliao basin, is currently the advanced region for heavy oil exploration in the western slope region. The oil reservoir is mainly tiny range structure oil-gas reservoir,lithology oil-gas reservoir and stratum-lithology oil-gas reservoir.This project is mainly the researching the construction interpretation of the top of S2+3 layer and G layer,Reservoir estimation,overall evaluation of oil-gas reservoirThrough the carefully analyzing the basic data in the work area, we think the 2D seismic data collected and processed in 2005 can't satisfy the need of construction interpretation and reservoir inversion. we accomplished the widening frequency processing of 2D seismic data on the base of many examinations and argumentation. The range of the dominant frequency increased from 110 Hz to 130 Hz. We increased resolution On the premise of holding the SNR. The waves of the purpose layer is obvious, faults are clear. While doing the work of construction interpretation on the widening frequency processing 2D seismic data, Small faults can be identified more easily in the seismic cross-section. structural error margin is less than 0.5%. In the 2D seismic data after widening frequency processing ,the identified minimum thickness of the purpose layer's sand layer is 2 meters. After doing the work of reservoir inversion by making use of the data after widening frequency processing, we formed a wave impedance data volume,a natural electric potential volume and a specific resistivity data volume. making good use of the three kinds of inversional data volume to forecast the distribution scope of sandstone layer and the characteristic of ties of matter, And make use of reservoir inversional data volume to identify the lithologic trap and forecast the distributes scope. Combined with the analysis of the predecessor about main factor of oil-gas pool formation, making use of the result of this research of construction interpretation and reservoir inversion ,comprehensively estimate the advantaged target space of the work area.The work area is wholely a slope inclining towards to east,small faults and the tiny range structure develop,T1, T1-1two reflecting layers have 143 faults and 21 structural traps by the interpretion.The total area is 35.79 km2 . Under the control of the regional deposition system,The work area mainly develops river and delta sedimentary facies,The advanced sedimentary facies control the distribution of sandstone layer, and be advantageous to the formation of the lithologic trap. It is predicted that the top of the Gaotaizi oil layer mainly develops 4 litho -logic trap with 12 lithologic volumes,The total area is 208.15 km2; S2+3 oil layer mainly develop 4 lithologic trap with 15 lithologic volumes,The total area is 303.4 km2. The oil and gas of the work area mainly comes from The Qijia-Gulong Hollow, Only the low range structural traps or the layer lithologic traps located in the path of oil migration can form oil-gas accumulation.It is predicted on this that the advanced area is 203.29 km2,the advanced area of S2+3 oil layer is 127.18 km2,the advanced area of the top of G oil layer is 76.11 km2.