Study On Prediction Method Of Abnormal Stratigraphic Pressure Of Shale Oil

Abnormal stratigraphic pore pressure is a common geological phenomenon,its widely exist in the stratigraphic of petroleum basins.The overpressure in the stratum will have an important influence on the existence and movement of underground oil and gas,and have the most direct influence on the stratigraphic,migration,accumulation and stratigraphic of oil and gas reservoirs.By studying the changes in the pressure of the strata,it's one of the most important ways to study the patterns of oil and gas in the oil and gas system,the distribution of energy in the system.Especially in recent years,the study on abnormal stratigraphic pressure has become an important reference factor in reservoir description and evaluation.It has attracted more and more attention from various scholars and researchers.Therefore,it is of great significance to study abnormal stratigraphic pressure,especially the study on abnormal high pressure in complicated geological conditions.It is necessary to study that cause of abnormal stratigraphic pressure,which helps to provide basic theoretical data for predict pressure.Influence of abnormal pressure on that reservoir element of oil and gas,as well as the response characteristics of these effect in seismic exploration and well logging data,is the main theoretical basis and source of the force prediction.On the basis of the mechanism based on the genetic mechanism of the abnormal stratigraphic pressure in deep analysis,the prediction of the stratigraphic pressure of the stratigraphic pressure is investigated in the study area by considering the geology and reservoir characteristics of the reservoir in the hidden river basin of the research area.By referring to the literature,analyzing and evaluating various methods of predicting stratigraphic pressure,and combining with the actual geological,logging and seismic data of the study area,the paper finally proposes to use the seismic,logging data,stacking velocity spectrum and the previous experience to calculate,correct,transform and finally substitute the related seismic data into the prediction formula for simulation calculation.This paper mainly takes Eaton formula as the core.First,the seismic data data from the research area is transformed,and by multiple calibration and contrast,the data on the speed of the seismic velocity is obtained.And using the seismic data for pressure prediction is the key to whether calculation accuracy of interval velocity is higher,and the later period of the data error correction can be further reduced.Firstly,the study area was delineated by selecting Wells with complete data and data of measured stratigraphic pressure data.After that,it was written through MATLAB software to calculate the calculation of the velocity control points in the area.In order to improve the accuracy of data,residual time difference analysis shall be carried out on the data to derive a suitable calculation model;Then the measured data are substituted into the calculation to obtain a more accurate layer velocity field data.After that,the target layer is precisely stratified,which ensures the accuracy of calculating the time-depth relationship data body of the layer using Dix formula.Finally,the parameters required by Eaton formula are calculated and the abnormal stratigraphic pressure is predicted by substituting them into the Eaton formula.After complicated calculation,a more accurate pressure prediction result is obtained,which is compared with the measured stratigraphic pressure data obtained in the actual drilling process.That means that the predictive method is applicable in the study area,and the results are highly reliable.Due to the anomalous porosity pressure of the reservoir and the oil and gas migration,the reservoir has a very close connection,and it has been linked to the geological,velocity,and construction of the research area,it can be better to direct the study of the oil and gas migration in the research area and the concentration of the advantageous distribution area,and to provide important theoretical grounds for drilling,prospecting,and development for further oil and natural gas in the region.