A STUDY AND APPLICATION OF THE RELATIONSHIP BETWEEN SEDIMENTARY FACIES AND VELOCITY AND IMPEDANCE IN GUANDU 3-D AREA

On the base of sedimentary micro facies detailed analysis of 6 wells in Guandu structure zone,it is carried out that a study on the relationship between various sedimentary micro facies and formation velocity and the relationship between various micro facies and wave impedance parameter.It is founded that sedimentary micro facies can obviously control the wave impedance and velocity,furthermore,we can learn the general pattern and their mathematical expressions of relationship variation of sedimentary facies with velocity and wave impedance.Because of the fact that the oil-gas accumulation in this area almost distributes in the concave flood plain,it is possible to predict the sedimentary facies by geophysical parameters.By converting these geophysical parameters sections into sedimentary facies sections,sedimentary micro facies can be used to forecast the distributing of concave flood plain sand body.The study has significant value on study on river facies deposition and it has also important practical value for the work area.