Seismic Acoustic Impedance and Well Data Integration Using Sequential Gaussian Simulation in Miocene Carbonate Reservoir Characterization of Tambun-Pondok Tengah Field, Indonesia

Nurzaman, Zamzam, Artini Sukotjo, Made Oka Iriana, Tavip Setiawan, Endro Hartanto, Pertamina Hulu Persero, Jakarta Pusat, Indonesia

Tambun-Pondok Tengah Field is located in North West Java Basin, Indonesia. The main objective reservoirs cover 3 by 11 km2 areal closure with 60 m thick of hidrocarbon column of Miocene reefal carbonate Baturaja Formation. Heterogeneity and compartmentalization are strongly indicated from well surveillance. The field is in early phase of it’s development and exploration extention status so that it needs to be defined more detailed.

In this study, the integration of seismic acoustic impedance with well properties using Collocated Co-Kriging algorithm on Sequential Gaussian Simulation proves to be an effec­tive tool to models facies and properties distribution of the carbonate reservoir. It results that heterogeneity and compartmentalization can be characterized more precisely. Seismic acoustic impedance volume that was generated by using constrained sparse spike inversion method shows good correlation with well properties.

A dextral strike slip fault activity had inverted the carbonate platforms into various iso­lated carbonate platform complex and various depositional phases. The field can be divided into three different blocks based on their unique compartmentalization mechanism and dif­ferent fluid contacts. The total pore volume of this field is approximately 980 million-barrels calculated from the three major reservoir traps. Reservoir property distribution shows that most reservoirs in the blocks seem to be bounded locally into many segments. To achieve optimal recovery of oil in this kind of reservoirs, a pressure maintenance program should be implemented immediately.