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Technical Paper: Characterization of Heterogeneous Carbonate Reservoir with Advanced LWD Technology: Case Study of LHX-1 Oilfield, South China Sea

Society: SPE
Paper Number: 16833
Presentation Date: 2013
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Abstract

Integrated with core data, geological data and logging while drilling (LWD) borehole resistivity image and density-neutron logs, this paper demonstrated a field case study to characterize the heterogeneity of LHX-1 coral reef reservoir in South China Sea; which includes geological facies, lithology, fractures, secondary pore system etc. This reservoir is featured with hyper heterogeneity resulted by overlapped reefs, which have created vertical and lateral variation. 

High resolution LWD resistivity image logs were selected to address specific challenges and unknown:

  1. appraisal well with limited data in place
  2. uncertainty regarding controlling factors on fracture and secondary pore system
  3. structural uncertainties including reservoir buried depth and thickness
  4. uncertain controlling factors affecting original productivity and future production decline.

The use of the integrated dataset was successful in delivering a full characterization of the reservoir heterogeneity: Fracture distribution was recognized and fairly understood in planar view and analyzed from qualitative and quantitative perspectives, secondary porosity was estimated and analyzed, and the controlling factors on productivity were clarified. The integrated analysis processes and expertise gained in this case study could be referred in other field development projects, not limited in carbonate reservoirs, but also in other heterogeneous reservoir such as turbidite or tight sand.

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