Analysis of reservoir characteristics and their effect on productivity of overseas carbonate reservoirs

doi:10.3969/j.issn.1006-6535.2021.03.007

Abstract

Abstract: A comprehensive and detailed analysis of reservoir characteristics is urgently needed to address the problems of complex and diverse lithologies and space types, difficult identification of favorable reservoirs, and poor understanding of distribution characteristics of fracture zones and effect on productivity in the Karabulak Oilfield (a carbonate reservoir), the South Turgay Basin, Kazakhstan. By applying core-conventional logging-seismic data calibration step by step, centered on sensitivity curve and sensitivity parameter optimization, four lithologies were identified, mainly tuff, biotuff, breccia tuff and mud tuff. Reservoir space types were dominated by fracture-cavity type, fracture-karst breccia type, fracture type and cavity type. According to the results of formation testing and pilot production, the reservoirs were divided into Types Ⅰ,Ⅱ, and Ⅲ, and favorable reservoir development areas were identified, including biological limestone development area, fractured limestone development area, and argillaceous limestone and karst breccia development area. fracture development areas are mainly concentrated near the northern fault zone of the central area, with great contribution to productivity of the oilfield. This study provides important ideas for the study of the characteristics of overseas carbonate reservoirs and an important reference for efficient development of similar reservoirs.

Key words: carbonate reservoir, reservoir characteristics, favorable reservoir, productivity analysis, South Turgay Basin, Karabulak Oilfield

CLC Number:

TE122.2

Lu Zhiming, Xu Shipeng, Aini Maimaiti, Wang Chenglin, Gao Liqun, Yang Zhigang, Yan Chao, Huo Jinjie. Analysis of reservoir characteristics and their effect on productivity of overseas carbonate reservoirs[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 47-53.

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