中東カフジ油田，中部白亜系ブルガン層における河川成砂岩油層の分布予測

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  • A positive prediction of the reservoir distribution based on sedimentological and sequence stratigraphic constraints for 3D-reservoir models of the Middle Cretaceous Burgan Formation(Albian), Khafji Oil Field, ex-Neutral Zone between Saudi Arabia and Kuwait.
  • チュウトウ カフジ ユデン チュウブ ハクアケイ ブルガンソウ ニ オケル カセンセイ サガン ユソウ ノ ブンプ ヨソク

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The Middle Cretaceous Burgan Formation (Wasia Group) includes two main oil reservoirs, 1st and 2nd Bahrain Sand in the Khafji oil field, offshore of the ex-Neutral zone between Saudi Arabia and Kuwait. Detailed 3D reservoir models considering complicated reservoir heterogeneity for both reservoirs were constructed to manage these two reservoirs more efficiently using a reservoir simulator.<br>The Burgan Formation is mainly composed of sand and shale layers with thin carbonate and coal beds. The formation can be characterized by three types of log facies which are defined from the correlation between shapes outlined by gamma-ray and resistivity log curves and core description. As a result of the correlation on the basis of these log facies, it is interpreted that the formation is basically composed of repetition of a parasequence unit represented by widely distributing funnel-type log facies, which is often cut horizoutally by narrow and meandering channel sands represented by bell- and cylindrical-type log facies. The mode of channel distribution, sedimentary facies and palynological analyses in each parasequence unit indicate that the formation is composed of three depositional sequences recording eustatic sea-level changes which caused various depositional settings from the middle reach of a huge fluvial system to shallow marine near the river mouth.<br>To construct a 3D reservoir model, digital isopach maps for both sand and shale layers were constructed considering specific depositional environments and the direction of regional sediment supply, and then the isopach maps were digitally stacked beneath the top structure map. Finally, reservoir property maps, such as average porosity and net gross thickness ratio maps, were generated, which were adjusted to become consistent with the pattern of isopach trends, considering the sedimentary energy condition in the interpreted depositional environments.

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