Integrated Geology and Reservoir Study in Determining Hydrocarbon Reserves in Pangkal Field (2010)



Pangkal field is located in the Palembang High area of South Sumatra basin (Figure.1). Operations in this field began in 1987 with the wildcat Pangkal-1 well. A total of 35 wells have been drilled and currently 1400 BOPD are produced from 14 active wells. Since 2005, intensive infill drilling has been applied in Pangkal field with satisfactory results. The production rate increased from 370 BOPD in January 2005 to a peak production of 2300 BOPD in March 2009. The last 13 infill wells were used to restudy the subsurface interpretation of Pangkal field. The objective of this study is to attain the best possible reservoir model using appropriate parameters, in order to obtain the most accurate reserve calculation for Pangkal field. In line with the development plan in Pangkal, It was decided to generate the reservoir model based on new 3D seismic data in this field. The purpose of the reservoir modeling was to construct the exact shape of the reservoir layers. Thus the area, thickness and petrophysical properties distribution of pay zone can be determined. Chronostratigraphic analysis was used to determine the facies changes in this field. The depositional environment is complex, consisting mostly of stacked channel, which causes a more complex variation in the reservoir distribution. All well data have the potential to aid in this process, with well testing results and production data equally able to contribute to identifying significant geologic horizons. The integration of geology, petrophysics and production data was really helpful in making a well correlation and in creating the reservoir model. Calculating the reserve is done by using the deterministic method. Based on the integrated G&G and reservoir study above, more appropriate reservoir parameters have been obtained.


Author : Happy Devi Thesly, Doddy Sagita Asra, Ellin Ika Gartika, Tino Febriwan, Jhon J Wood