Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 133-143.doi: 10.12108/yxyqc.20200313

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Pore structure characterization and its impact on waterflooding development in Khasib reservoir in Ahdeb Oilfield，Iraq

CHEN Mingjiang, CHENG Liang, LU Tao   

  1. Research Institute of Geological Exploration and Development, Chuanqing Drilling Engineering Co. Ltd., CNPC, Chengdu 610051, China
  • Received:2019-05-20 Revised:2019-09-04 Online:2020-05-21 Published:2020-04-30

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Abstract: Khasib reservoir in Ahdeb Oilfield of Iraq is a typical porous carbonate reservoir in the Middle East, and it is characterized by high porosity, low permeability and strong vertical heterogeneity. To understand the causatives for high water cut and rapid breakthrough of injected water in horizontal wells, this paper focused on the three-dimensional characterization of the multi-modal pore structures. Based on core observation, thin section and SEM identification and quantitative analysis of MICP (Mercury Injection Capillary Pressure) curves, 24 rock types were classified in Khasib reservoir according to lithofacies and petrophysical properties. Spatial distribution of the rock types was characterized by well-log correlation, and effective pore-throat radius was extracted from the MICP curves for each rock type. Thus, the three-dimensional distribution of effective pore-throat radius was visualized. The results show that:(1) Effective pore-throat radius ranging from 0.09 μm to 9.2 μm increased upwards and decreased westwards along the long axis of the anticline(from AD1 block to AD4 block).(2) The layer of Khasib2-1-2 L with its average thickness of 0.8 m is a grainstone dominated by interparticle pores,and its average effective pore-throat radius and permeability are 7.2 μm and 278 mD,respectively,which are ten orders of magnitude higher than that of the adjacent layers.(3) The layer of Khasib 2-1-2 L that is referred to as the highpermeability 'thief zone' is a preferential fluid flow passage and is the control factor of rapid breakthrough of injected water.(4) The results were confirmed by typical water control diagnostic plot,production logging as well as resistivity variation observed in vertical wells drilled through the reservoir. The research results provide a reliable basis for oil stabilization and water control in the reservoir,and based on this,reasonable development adjustment measures were proposed.

Key words: carbonate reservoir, rock type, pore structure, high-permeability zone, rapid water breakthrough, Ahdeb Oilfield

CLC Number: 

  • TE122.2
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