Reservoir Prediction And Favorable Area Evaluation Of Fuyu Oil Bed In Chao 83 Block,chaoyanggou Oil Field

Fuyu oil bed of Chaoyanggou oil field is low porosity and low permeability reservoir, the main oil layer are composed by channel , sand body are narrow stripped and thickness changes quickly. These complex geological feature are restricted the oil field development. The tradition using the data of well logging, seismic and so on to be very difficult to clarify the sand body growth scope and the scale. How carries on the reservoir forecast, the enhancement forecast precision and the objective reasonable determination advantageous area always are the main questions which faces in the scientific research production, which is also directly affecting the next exploration development of oil field.This article take Fuyu oil bed of Chao 83 block as study object. Take the high resolution sequence stratigraphy theory as the instruction, Unification sequence was established by well and seismic contrasts. Fuyu oil bed was divided into 2 long-term half cycle, 7 intermediate stages cycle, 30 short-term cycles, 5 kinds of 14 sub-kind of sand body contact relations pattern of Chao 83 block were established.Through the cluster analysis, optimal best seismic attribute combination, the sand thickness and the seismic attribute mathematical model was established, so the sand distributed and growth situation was forecasted, the shape of sand are banded, flake, or intermittent lenticular. By spectral analysis, the low frequency information can reflection overall reservoir characteristic well, the high frequency information are more advantageous to the thin channel. The application neural network earthquake forecasting technology, the different seismic facieswere divided, the distributed scope of different deposition reservoir were forecasted. Using the multi parameter return method, the statistics relations of seismic attribute and property has established, forecasted that the porosity of Fuyu oil bed are smaller than 18%, the minimum value is 2.1%, maximum value is 30.3%, mean value is 13.2%. Uses the above technical method to carry on reservoir forecast, can both confirm the forecast result mutually, and causes the forecast result to be more objective credibly, and provide advantageous basis.for seeking the advantageous area.Based researched above, mainly control factors of oil accumulation were researched, finally multi-dimensional method was applied to carry on the reservoir prediction, and three types favorable area were forecasted.