Fine Logging Interpretation Method Of Heavy Oil In C Oilfield

The heavy oil reservoir heterogeneity is strong and the four relationships are complicated in C oilfield.The reservoir has many thin layers and the oil is not uniform.There are many dry layers and poor layers in horizontal wells.It is difficult to identify the oil and water.These difficulties have seriously affected the evaluation and development of heavy oil in this area.In this paper,a set of reservoir parameter calculation model and fluid identification method are established through the detailed interpretation and evaluation of the heavy oil area in C oilfield.This is of great significance to the production and development of the oil field in the later period.According to the situation of heavy oil area,this paper analyzes the data of rock power,mercury intrusion,phase infiltration and grain size to study the pore structure of heavy oil reservoirs,and recognizes and analyzes the basic characteristics,such as lithology,physical properties and seepage properties.The study of four relationships in heavy oil area was conducted to establish geological and log base for fine interpretation and evaluation of heavy oil well logging.The relevant logging response characteristics of oil layer,water layer and dry layer are summed up,and the lower limit of physical properties of the reservoir is comprehensively studied by using methods such as exhaust pressure method,minimum hole throat radius method and tail flick method.After the core data were restored,a reservoir parameter log interpretation model was established.Because of the strong non-average value,the porosity and permeability models were established using the layer point method.By comparing the effects of different saturation models,the final decision was made to select the Indonesian formula for saturation.The identification standard of thin sandwich was established.The method of effective identification of fluids such as plate method,curve overlap method,and array induction identification method was established,and fluid distribution was evaluated by multi-well comparison.The borehole trajectory analysis,stratigraphic correlation and interface identification are carried out for horizontal Wells,and the response characteristics of horizontal well logging curves are analyzed.The calculation model of oil production parameters was established by using oil test and trial production data,and the daily oil production of horizontal well was estimated.The interpretation result is compared with the conclusion of test oil production.The coincidence rate is high and good geological application results are obtained.It lays a solid theoretical foundation for guiding horizontal well completion and setting up production plan.