Borehole imagers have been part of logging services since early 1990 and many images have been acquired since then. With an increase in the data acquisition, an expansion in the applications of these data has followed.
Borehole Images are an extremely valuable data as they represent the closest comparison to an outcrop or core that can be acquired in a borehole.
Interpretation workflows associated to these data, provide a high level and high resolution details which turns into an increase predictability of subsurface models.
Borehole Images and Dipmeter data can be utilized for a detailed structural analysis of the borehole, they can highlight the presence of fractures, they are used to analyze porosity partitioning in heterogeneous carbonate formations, they help in determining in situ stress orientation with the identification of drilling induced fractures and borehole breakouts and can be the main data in facies analysis and sand body orientation studies.
The beginning of the talk will focus on the different measurement available to acquire borehole images: especially a clarification on electrical borehole images versus acoustic borehole images will be made. Then various borehole images examples will be shown which highlight specific applications all very much in use nowadays in the Permian basin: from the identification of different fractures to the determination of the insitu stress orientation, to the orientation of sand bodies through the analysis of sedimentary features in the sands. Additionally some advanced methodology will be shown, focused specifically on the carbonate porosity partitioning and characterization. At the end some preliminary results on the Katz Strawn field facies analysis based on images will be shown at the end of the talk.
Speaker Valentina Vallega
Valentina Vallega is a geologist working for Schlumberger based in Midland, TX. She is originally from Genoa, Italy, where she obtained her Master degree in Geological Science with a thesis work in the highly metamorphic area of Golfo Aranci, Sardinia, working on microstructural analysis to understand various phases of deformation. ...
Valentina Vallega is a geologist working for Schlumberger based in Midland, TX.
She is originally from Genoa, Italy, where she obtained her Master degree in Geological Science with a thesis work in the highly metamorphic area of Golfo Aranci, Sardinia, working on microstructural analysis to understand various phases of deformation. She obtained her master degree in July 2000 and joined Schlumberger in February 2001 as Wireline Field Engineer based in Aberdeen, Scotland. She gained a deep experience in logging operations offshore North Sea and offshore India. After 6 years spent in the field she moved to a training role as Instructor in the Schlumberger Multidisciplinary training center of Abu-Dhabi. After 3 years in this role she moved to Cairo, Egypt as Geology Domain Champion: in this role she was deeply involved in borehole image and side wall coring acquisition planning and data analysis and interpretation supporting the acquisition segment and the customers. In August 2011 moved to Midland Texas as Geology technical team leader and she has not left since then.
In her current role she process and interpret borehole images acquired in the Permian basin with expertise in various application of borehole images: from fracture analysis to dual porosity distribution in carbonate reservoir, to sand body geometry and orientation in channelized sand deposits.
She is a member of the AAPG and part of the VGP (Visiting Geoscientist Program) and member of the WTGS and SEPM.