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- Title
FRACTURE CHARACTERIZATION FOR CARBONATE RESERVOIRS: A CASE STUDY ON NT OILFIELD IN THE EASTERN MARGIN OF THE PRE-CASPIAN BASIN.
- Authors
WANG, S.-Q.; ZHAO, L.; LUO, M.; ZHAO, W.-Q.; LI, J.-X.; WANG, C.-G.; SUN, M.; ZHAO, L.-D.; LI, W.-Q.; LI, C.-H.
- Abstract
In order to make full use of well logging information to accurately predict the fracture distribution of carbonate reservoir, we use several log curves to comprehensively identify and delineate the structural fractures, dissolved fractures and sutured fractures of different occurrences, scales and geneses in the North Truwa oilfield of the Pre-Caspian Basin in Kazakhstan. The resistivity differenceratio method may be used to identify high-angle fractures. The 3-porosity ratio method, which tends to be affected by dissolved pores and vugs, is applicable to low-angle fractures and microfractures. By using each single method separately, only 54.8% of fractures on the average may be identified. The comprehensive probability density method which integrates the above two methods improves the accuracy of fracture identification to 73.6% as per the validation of core and imaging logging data. Fracture distribution in the study area is dominated by sedimentation, structure and diagenesis. In the lateral direction, the structural highs and areas with intense karstification may demonstrate high fracture probability density and thus areinterpreted to be rich in structural and dissolved fractures. In the vertical direction, more fractures may occur in the brittle intervals with small shale and gypsum contents. The results of fracture prediction are consistent with the sedimentary diagenesis of carbonate reservoirs, indicating that the method is feasible to predict the fracture.
- Subjects
CARBONATE reservoirs; OIL fields; OIL well logging; DIAGENESIS; SEDIMENTATION &; deposition
- Publication
Applied Ecology & Environmental Research, 2018, Vol 16, Issue 3, p2885
- ISSN
1589-1623
- Publication type
Article
- DOI
10.15666/aeer/1603_28852898