--> Abstract: The Use of Image Logs to Decipher Complex Structures and Aid in Well Completions within Mature Basins; #90063 (2007)

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The Use of Image Logs to Decipher Complex Structures and Aid in Well Completions within Mature Basins

 

Howard, Thomas M.1, Paul Elliott1, Dalton Lockman2 (1) Halliburton, Houston, TX (2) Plains Exploration & Production Company, Bakersfield, CA

 

The Inglewood oil field is located along the Newport-Inglewood Fault trend of the Los Angeles Basin, CA. The field has undergone several phases of development since its discovery in 1924. The field's initial development was based solely on drilling topographic highs and establishing production primarily from the shallow zones where the geologic structure was more easily understood. Geologic data collected during the first 70 years of production consisted of formation tops identified from well logs of wells that were drilled into Pliocene and upper Miocene zones.

 

During the past three years, older, middle Miocene zones have been the target of new development. Results from recently drilled wells indicate that geologic structure is still a dominant factor in accurately understanding and identifying deeper zones in the field with new reserves. These lower zones are structurally complex reservoirs that present challenges both in characterization and subsequent development. Thirty of forty development wells drilled into the lower most zones have been logged with conventional triple combo openhole logging suites and electrical microimage logs. Dips and textural information from the image logs have been used to 1) re-map the subsurface and resolve thrust fault geometries in the Miocene; 2) identify facies textures associated with igneous body(ies) not previously identified; 3) identify productive fractured intervals in a nodular shale unit; and 4) refine the selections for perforation and stimulation within sand reservoir intervals. At the forefront of issues addressed is the collection of reliable dip information that will be used to understand the structure and compartmentalization of newly discovered reservoirs.

 

Throughout the drilling program, iterative interpretations were possible with client-interactive data sets from each well.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California