Application of PLT and Tracer Testing Data on Deposition Study and Reservoir Geological Modeling-A Case From the Mishrif Formation in H Oil Field in Southeast Iraq

Abstract For many oil fields, due to the limitation of economic benefits or short development history, there are many difficulties, such as fewer cores, larger spacing of cored wells and poor seismic data quality, etc. This paper takes a giant carbonate reservoir in H oilfield as an example, utilized common reservoir monitoring data, namely PLT and tracer detection data, to assist sedimentary facies research and get more convincing results in both deposition understanding and facies model. The new procedure of deposition study and facies modelling were introduced as follows: Firstly, with comprehensive geological data, the sedimentary facies study was conducted and the initial sedimentary facies maps were made; Secondly, the PLT data and tracer detection data were collected and analyzed; Thirdly, reservoir monitoring data were utilized to improve the initial sedimentary facies understanding. Finally, the sedimentary facies maps were redrawn and used to constrain facies modelling and a few realizations of facies models that complied with the geological knowledge were got. They are for the geologists and the reservoir engineers to choose the right realization together. Then the sedimentary facies maps were redrawn and used as trend to constrain facies modelling, which show better coincident rate between static and dynamic data. With the continuous reservoir development, the amount of reservoir monitoring data is gradually increasing, and the corresponding geological research is increasingly deepening. The new facies model was more in line with the actual underground conditions of the reservoir and laid a solid foundation for other workflows in the static and dynamic process of reservoir study. Without changing other parameters, the history match results improve significantly, which lays solid foundation for reservoir management.