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JOURNAL OF MECHANICAL ENGINEERING  > 2020  >  38(4): 838-850.
FengFeng LI, Rui GUO, LiFeng LIU, YiChang YU, ShiQi SONG. Sequence Architecture and Reservoir Distribution of the Cretaceous Mishrif Formation in M Oilfield, Iraq[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 38(4): 838-850. doi: 10.14027/j.issn.1000-0550.2019.078
Citation: FengFeng LI, Rui GUO, LiFeng LIU, YiChang YU, ShiQi SONG. Sequence Architecture and Reservoir Distribution of the Cretaceous Mishrif Formation in M Oilfield, Iraq[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 38(4): 838-850. doi: 10.14027/j.issn.1000-0550.2019.078
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Sequence Architecture and Reservoir Distribution of the Cretaceous Mishrif Formation in M Oilfield, Iraq

doi: 10.14027/j.issn.1000-0550.2019.078
Funds:

National Science and Technology Major Project 2017ZX05030⁃001

  • Received Date: 05 May 2019
  • Publish Date: 10 Aug 2020
    Abstract
  • In order to clarify the distribution rules and control factors of the Cretaceous Mishrif Formation carbonate reservoir in M oilfield, Iraq, based on the core, logging, and cast thin sections, lithofacies analysis was carried out under the control of the regional third⁃order sequence. The Mishrif Formation was divided into six quaternary sequences (SQ1⁃SQ6) by identifying the exposed interface of the carbonate rock, the lithologic transition surface, and the maximum flooding surface. The result shows that there were four types of sequences: the exposure of the restricted platform, the exposure of the shoal, the non⁃exposure of the shoal, and the long weathering and erosion. Different sequences had different sedimentary environments, system tracts, sequence boundaries, and exposure times. The exposure of the shoal developed high⁃energy sediments, such as the rudist shoal, bioclastic shoal, and front shoal in the high system tract. The exposure boundary of the restricted platform was characterized by the formation of thin carbonaceous mudstone. The spot shoal located mainly in the high system tract and the dense cemented layer formed in the late stage of the high system tract could be used as a good barrier. The sequence boundary for the non⁃exposure of the shoal was the lithological transition surface, and the reservoir mainly formed in the tidal channel and the bioclastic shoal in the high system tract. The long weathering and erosion developed bioclastic shoal in the high system tract, and the weathered breccia zone in the low system tract could be the high⁃quality barrier. In addition, the dolomitization associated with the bioturbation effectively improved the properties of sediments in the lagoon of the transgressive system tract, forming a number of thin reservoirs.

     

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