One of the most challenging problem in the Plan Of Development for developing the Globigerinid sands carbonate reservoir in determining hydrocarbon potential in the reservoir is the management decision for go and no go project.
In the North-East Java Basin Indonesia, Pliocene Globigerinid sands carbonate was proven as oil and gas potential reserves as found in MDA, TSB, O and M fields, which are operated by several PSC (Production Sharing Contract) companies. The last three fields are in the development phase. Uncertainty issues related to structure, stratigraphy, and pore system were critically influential factors for the success level in the development plan of the fields.
In fact, the results from development wells in one of the fields in the offshore of the Madura-Strait, have indicated a significant difference compared to the Plan of Development based on exploration and appraisal wells. The problems were compartment related due to structure-stratigraphy combination; variation of the depth of fluids contacts for each compartment; low-resistivity case in clean-oil zone; extensive fault development; change and correction of hydrocarbon in-place estimation. All issues above will change the economic of the field.
Based on the lesson learn, an extensive analysis was needed to reduce the uncertainty that influence the economic plan of development before the government grants an approval to develop the field or revised the Plan of Development. There were some identified critical factor to increase the success level for the optimal development of carbonate reservoir Globigerinid sands as follows: the 3-D seismic (multi-component) included inversion and attribute analysis, exploration and appraisal well numbers & type, production test data, laboratory analyses, integrated evaluation with other discipline and so on.
Based on the experienced and integrated approach, the real picture of development of any future fields that contain the Globigerinid sands carbonate reservoir with unpredicted uncertainty factors has been solved and made the economic prospect development became more realistic.
Introduction
Pliocene Globigerinid sands carbonate within the Mundu formation that has been proven as oil and gas potential reserves as found in MDA, TSB, O and M fields are located at the Madura-Strait of the NE-Java Basin, Indonesia (Figure-01).
The productive reservoir at those fields consists mainly of the fossilized tests Globigerina. The reservoir is unique in that there are no oil / gas-producing analogs and limited their production experience. This lack of comparative data makes prediction of reservoir performance difficult.
Recently, an integrated-disciplinary approached was applied for geology-geophysics-reservoir modeling to reduce subsurface uncertainties leading to more realistic planning.
Uncertainty issues were related to structure, heterogeneity reservoir and compartmentalization. They were the main influence factor for success level in developing Globigerinid sands carbonate in the fields.
The main aim of this paper is to demonstrate, investigate, and resolve the comparison between planning and the actual condition of field development.
