Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (4): 1007-1020.doi: 10.13278/j.cnki.jjuese.201704104

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Shoal Facies Reservoir Characteristics and Genesis of Mishrif Formation in Halfaya Oilfield,Iraq

Wang Yuxiang1,2, Zhou Wen3, Guo Rui4, Fu Meiyan3, Shen Zhongmin3, Zhao Limin4, Chen Wenling3   

  1. 1. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China;
    2. Wuxi Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Development of SINOPEC, Wuxi 214126, Jiangsu, China;
    3. State Key Lab of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), Chengdu 610059, China;
    4. Research Institute of Petroleum Exploration ＆Development of CNPC, Beijing 100083, China
  • Received:2016-10-27 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by China National Petroleum Corporation Major Project During the Twelfth Five-Year Plan Period (2011E-2501)

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Abstract: The Mishrif Formation in the Halfaya oilfield of Iraq develops shoal facies reservoir, and it is one of the main producing horizons in the study area. The Mishrif Formation sedimentary facies has been studied using the data of core, thin section and well logging. The result shows that four types of sedimentary facies are developed in the Mishrif Formation, which are restricted platform, open platform, intra-platform and margin platform. The shoal facies reservoirs are developed mainly in the facies of open platform and margin platform. Casting thin sections observation, physical experiment, and mercury injection are conducted to study the characteristics and genesis of shoal facies reservoirs. A shoal facies reservoir has multiple types of rocks, including bioclast limestone, bioclastic packstone/wackestone and calcarenite etc., and the rock particles are thicker. The pore types are various, mainly in the form of moldic pore, intergranular pore, dissolved pore and visceral foramen, of which intergranular pore and moldic pore development are the most widespread. To all kinds of shoal facies reservoirs, the porosities are higher, the permeabilities differ distinctly with the average permeability at (2.35~139.17) ×10-3 μm2. The overall pore structure is relatively good, displacement pressure is low, but large throats are developed. The development of shoal facies reservoirs is controlled by the depositional environment and diagenetic transformation degree influence. A favorable sedimentary condition is the foundation of the shoal facies reservoirs development, and syngenetic period dissolution modification improves the reservoir properties, so that it become a high quality reservoir.

Key words: shoal facies reservoir, genesis analysis, Mishrif Formation, Halfaya oilfield, Iraq

CLC Number: 

  • P618.13
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