Identifying Opportunities and Reducing Uncertainty in Development of Bypassed Multilayer Reservoirs through Integrated Mass Spectrometry with Conventional Logs in Dina Terciario Field, Honda Group (La Victoria Formation), Upper Magdalena Basin, Colombia
Sanchez, Fabio A.1; León, Juan M.; Patino, Cesar A.; Osorio, Raul; and Ortiz, Diego
Paper illustrates how the first application in the country of innovative technology of mass spectrometry integrated with conventional logs can improve the reservoir development and optimize well completions, identifying gas oil and water zones in multilayer reservoirs while drilling. The paper discusses the key principle of mass spectrometry (in which C1-C10 components and benzene, hexane, cyclohexane and toluene in combination with a Petrophysical analysis from conventional logs with a high uncertainty in water saturation (because in this field there is fresh water). have the capability to identify gas, oil and water zones within the reservoir. The application of the principle is illustrated with a case study of a northern part of DT Field, Upper Magdalena Valley, Colombia.
After an extensive geologic study into de The Honda Group, the lower sands called La Victoria Formation have two (2) depositional environments of fluvial sedimentation interpreted from sedimentologic and petrologic evidence: The lower sand called Arenisca inferior 2 is a low gradient-high sinuosity system and the upper sand called Arenisca Inferior 1 is a high gradient-low sinuosity system. Both systems, favored during volcanic activity, resulted in red hematitic floodplain mudstones of montmorillonite, illite-montmorillonite and kaolinite, nonconglomeratic, subarkosic to arkosic, sand-bodies. The reservoir is an anticline with 8 different reservoirs, in the La Victoria Formation. The reservoirs have different oil gravities varying from 18° to 22° API, and different GOC’s and WOC’s hard to identify with conventional logs.
In addition, several bottom hole fluid samples were taken from the new wells drilled and analyzed in laboratory. Fluid data were compared with the spectrometry data. The lab results led to interesting conclusions. The production of the new wells shows that there are additional drilling opportunities. Based on reservoir engineering best practices, detailed reservoir studies, low cost and higher economic benefits, the mass spectrometry is one of the innovative technologies available while drilling. It can help geologists and engineers in a quick and reliable identification of gas, oil and water zones in a reservoir.
AAPG Search and Discovery Article #90166©2013 AAPG International Conference & Exhibition, Cartagena, Colombia, 8-11 September 2013