Research Of Reservoir Prediction Based On Logging And Seismic Attributes

The slice of seismic attribute stratigraphic body shows the distribution characteristics of each attribute value of seismic data with a certain time thickness,and it has become an important means of comprehensive seismic interpretation.However,in the study of the complex reservoir of river delta sedimentary types using seismic attributes,the seismic data interpretation layer cannot be strictly corresponding with the real geological interface,and the formation of the formation section can not strictly correspond to each period of sediment in the sand body,so the prediction effect of the sedimentary unit sand body in the stratigraphic section property section Poor.In order to solve this problem,this study is based on the analysis of sandstone thickness,partition condition and formation structure of each sedimentary unit in the purpose layer of the study area.It is considered that the vertical sand body structure is divided into isolated sand body,vertical stacked sand body,dislocation stacked sand body and composite stacked sand body,and horizontal direction is divided into horizontal direction.The sand bodies in the sand body and horizontal direction are divided into "mud bag sand" structure,"sand mud" structure and mud sand interbedding structure according to the conditions of interlayer.According to the characteristics of the target reservoir in the study area,the classification standard of sedimentary sand reservoir types based on the prediction coincidence rate of seismic attributes is established,in which the thickness of the single layer sandstone is more than 5 meters,the thickness of the single layer is less than 3 meters,the thickness of the accumulated sandstone is more than 10 meters,and the prediction of seismic attributes of the reservoir is more than 75%;the single layer sand of the B reservoir is the single layer sand.The thickness of the rock is 3 to 5 meters,the thickness of the single layer is 3 to 5 meters,the cumulative sandstone thickness is 5 to 10 meters,the prediction of the seismic attribute is 50% to 75%,the thickness of the single layer sandstone of the C type reservoir is less than 3 meters,the thickness of the single layer is less than 3 meters,the thickness of the accumulated sandstone is less than 5 meters,and the prediction coincidence rate of the seismic attribute is less than 50%.On the basis of reservoir classification,the reservoir characteristics of each sedimentary unit of the Portuguese oil layer are analyzed by the unit of sedimentary units.According to the ratio of various reservoirs,the characteristics of seismic response and the regularity of the sand body plane distribution,thesedimentary units are divided into three levels,of which the prediction of the seismic attributes of the first grade sedimentary unit is the best,and the three level of the sedimentary units The prediction effect of seismic attributes is poor.According to the characteristics of sand bodies in different sedimentary units,the reservoir seismic description technology of different levels of sedimentary units is formed.For the first grade sedimentary units,the distribution of the channel sand bodies can be better represented by the amplitude and frequency attributes of the root mean square in the single slice.In the reservoir with better interlayer,the root mean square amplitude property is chosen first;the reservoir with the poorer interlayer is first selected with frequency division property.For the two grade sedimentary units,the single attribute slice identification ability is poor,and multi-attribute dimension and elevation fusion technology can be used to improve the prediction ability of B reservoirs.For the three stage sedimentary units,the slicing technique can not satisfy the effective prediction of the single sand body and predict in the form of sand body combination.