Optimization Of Nuclear Magnetic Logging Mode In STH And Research On Interpretation Processing Method

The nuclear magnetic logging can intuitively distinguish physical parameters such as porosity and reservoir specific fluid type,which plays a pivotal role in oil and gas field exploration and development while it has certain advantages in describing reservoir dynamic changes.However,because of the complexity of well condition and the poor adaptability of existing equipments,when the nuclear magnetic test was carried out in the igneous strata of STH oil field,the successful rate of nuclear magnetic logging is very low;Besides,the formation parameters such as porosity obtained from the wells which were successfully tested are generally worse than the actual situation,and the method can not be used as an objective and accurate method to detect the formation physical parameters in STH oil field.In order to raise the success rate of logging and improve the situation as described above,the following research work shuld be carried out: At first,it is necessary to analyze and sum up the factors that affect the nuclear magnetic resonance logging in STH,from which it can be concluded that the uncorrected and uncontrolled factors that affect the logging in STH;On this basis,core experiment and theoretical analysis were used to further investigate the characteristics of STH formation development,distribution and paramagnetic properties;Further more,researcher study the physical influence of these special formations on nuclear magnetic resonance,then,we focused on the improvement and creation of nuclear magnetic supporting equipment,as well as the exploration of the specific setting of observation mode parameters,so that the nuclear magnetic resonance logging technology can be adapted to the special formation in the STH area.Besides,we also studied the interpretation of nuclear magnetic resonance logging data and proposed five interpretation models.Considering the diversity of interpretation results,the conventional step-by-step processing method of nuclear magnetic resonance logging data was changed to an integrated processing method,which greatly improves the longitudinal resolution of the data and allows for more accurate subdivision and evaluation of the formation;Finally,the application of nuclear magnetic resonance logging data was extended to the field of dynamic development of oil and gas fields,and the advantages of nuclear magnetic resonance data in water flooded zone determination and remaining oil saturation evaluation are explained in detail.The results show that:(1)The magnetic susceptibility characteristics of the STH volcanic rock formation lead to the low porosity obtained by the nuclear magnetic resonance test here,and the use of the DTW10001 observation mode can objectively reflect the physical properties of the volcanic rock formation.(2)The adoption of integrated processing method for the nuclear magnetic logging data can greatly improve the resolution of the result data.(3)The nuclear magnetic logging can effectively evaluate the water flooded zone and the remaining oil saturation,etc.,which provides a reliable basis for dynamic development of the oil field and production of both stable and progressing of the oil field in the middle and late stages.