Study On The Application Of Integrated Geophysical Methods Joint Forwarding And Inversion Technology In The Survey For The Hydrocarbon Reservoir

The west region of Xuefeng Mountain as the southern Marine carbonate area of oil and gas prospect area,it has a good prospect of development.There are many excellent primary hydrocarbon conditions.But the region includes complex geological terrain and harsh natural environment,that it seriously affects the efficiency and makes the exploration of seismic exploration can't achieve the desired effect.It is very important of using non-seismic geophysical methods for the survey of oil and gas resources,such as gravity prospecting,or magnetic prospecting and electrical prospecting.However,every geophysical prospecting methods have limitations.It is difficult to distinct abnormal interface of using gravity and magnetic exploration.The magnetotelluric sounding method(MT)longitudinal resolution drops rapidly with the increase of depth,and it difficult to distinguish abnormal boundaries,which make it easy for the uncertainties of using single geophysical method,especially the inversion interpretation,so that,the spatial distribution characterisics of underground rock are difficult to be finded out,and also affect the reliability of geophysical interpretation.As a result,using the integrated geophysical methods prospecting in survey oil and gas resources to find out underground structure characteristics and stratigraphic subdivision to improve the accuracy of geophysical interpretation.This paper sets out of the geophysical model for proposing the integrated geophysical methods joint forwarding and inversion technology is applied to the oil and gas geological,geophysical interpretation methods.The integrated geophysical methods joint forwarding and inversion technology is an important means of integrated interpretation.Through the study of geological data,geophysical data and drilling data in the study area,to extract the density parameters,the magnetic parameters,and the resistivity parameters,also to extract fault and anticline as the typical structure in the study area.And it analyzed the respond characteristics of gravity,magnetic,and MT of hydrocarbon model and non-hydrocarbon model.On the one hand,the abnormal of two typical structure models were be discussed.It has been concluded that the gravity anomaly reflect the features of shallow ground and basement stratum ups and downs,and MT can determine the structure development and division of strata.On the other hand,it is concluded that,the integrated geophysical methods joint forwarding and inversion technology by constructing and formation of recognition to achieve the purpose of indirect to find oil and gas through the discussion of models.Taking the study of EL area as an example,studied the physical parameters of the research area and analyzed the measured data of three geophysical methods.It has been divided the area to three tectonic blocks and six sets of physical layer.On this basis,through geophysical models simulation calculation and compared joint inversion model results with the measured data,then,through modified models to determine the final integrated geophysical methods joint inversion models.These were the final geological interpretation model.Comprehensived geological data and the measured data and the final geological interpretation model,discussed the distribution of faults,buried depth and scale.And also through discussed two parts of EL areas,one of parts has been assured the Oil and gas prospect areas.The another part has been assured reservoir adverse areas,because of in the pare the central anticlinorium of extremely low uplift,the nuclear division formation,indeed,the two wings are six strata development but more faults development,rock broken,bad for oil and gas reservoir.