Carbonate Factory

By May 18, 2014 May 12th, 2015 Workshops

Date: Sunday May 18, 2014
Time: 8:00 AM – 3:00 PM
Instructors: Volker Vahrenkamp, ADCO; Ed Clerke, SAUDI ARAMCO; Sandra Vega, Petroleum Institute; Raghu Ramamorthy, Schlumberger; Jonathan Hall, ADCO; Chris Smart, Gaffney Cline and Associates
Place: Capital Suite – ADNEC

The SPWLA 2014 Carbonate Factory workshop will examine the relationship between petrophysics and geology of the most prolific producing formations; Kharaib to Shuaiba, of Lower Cretaceous age, in the United Arab Emirates. Carbonate petrophysics is complex but not chaotic.  The one day carbonate factory at ADNEC on 18th May is complete in itself, but the opportunity exists for a limited number of registrants 20-30 also to travel to the northern Emirate of Ras Al Khaimar with an overnight stay at the Hilton and early morning visit to Wadi al Rahabah where there are exceptional seismic scale exposures displaying reservoir geometry distribution, and reservoir continuity of the major Abu Dhabi onshore and offshore producing reservoirs.

Dr. Volker Vahrenkamp of ADCO and his colleagues will provide the backdrop by explaining the setting of the deposition of the Kharaib formation Thamama Units and their relation to the carbonate platform margin covering most of the southeastern Arabian Gulf oil province.

Using slabbed core material, the participant will gain an appreciation of the major unit bedding, stylolites, lithology and characteristic fauna, which will also be examined in conventional log and log images. Visible heterogeneities will be identified and described.

This workshop will review and update previous SPWLA workshop content on the Petroleum Physics of Multimodal Carbonates established by the Saudi Aramco Rosetta Stone technology.  The material will range from the geological links to the reservoir simulation.  The workshop will define porositons and porobodons, the detection and quantification of the multimodal pore systems, the database methods for saturation-height modelling and the well log methods for refined reservoir pore system models (CIPHER).  This material is updated to include the new laboratory methods for evaluating multimodal carbonate relative permeability and ultimate waterflood recovery presented in 2013 in Beijing.  This new material presents spontaneous imbibition volumes and rates for M_1 bimodal pore systems for the first time.  Methods for inclusion into reservoir simulation will be discussed.

Jonathan Hall of ADCO and Chris Smart of G.C.A. will demonstrate that the carbonate Kharaib exhibits textural anisotropy, which has an impact on rock physics, permeability, conductivity and other transport properties, making traditional petrophysical “Archie type” saturation evaluation, permeability prediction and quantitative seismic characterization challenging.  Further, these formations exhibit at log and core measurement scales both texturally homogeneous and heterogenous character. The former resulting from grainstone or matrix micro-porosity dominating pore types and the latter resulting from the mixing of these, and the divers scales of fauna and diagenetic imprints comparable to and greater than core plug scale. This results in many petrophysical problems, such as, sampling and characterization of high permeability streaks and multiscale problems of core-log integration and upscaling for dynamic reservoir simulation modelling.

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