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Control factors of reservoir oil-bearing difference of Cretaceous Mishrif Formation in the H oilfield, Iraq
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ZHAO Limin,ZHOU Wen,ZHONG Yuan,GUO Rui,JIN Zhimin,CHEN Yantao
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Table 1 Distribution frequency of typical mercury pressure curves in dissolution-filling zone of different oil-bearing grades in Mishrif Formation of H oilfield.
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Oil-
bearing grade | Karst zone | Distribution frequency of
mercury injection curve/% | | Type I | Type II | Type III | Type IV | Type
V | | Oil rich | Tight basement zone | | | | | | | Cavernous dissolution zone | 14.3 | 28.6 | 57.1 | 0 | 0 | | Groove (cave) filled zone | 36.1 | 61.1 | 0 | 0 | 2.8 | Oil im-
mersed | Tight basement zone | 0 | 0 | 25.0 | 25.0 | 50.0 | | Cavernous dissolution zone | 19.4 | 13.9 | 58.3 | 2.8 | 5.6 | | Groove (cave) filled zone | 44.6 | 38.6 | 7.2 | 1.2 | 8.4 | Oil
spot | Tight basement zone | 0 | 0 | 13.6 | 18.2 | 68.2 | | Cavernous dissolution zone | 34.3 | 10.0 | 44.3 | 0 | 11.4 | | Groove (cave) filled zone | 56.7 | 24.5 | 5.7 | 1.9 | 11.3 | | Oil trace | Tight basement zone | 0 | 0 | 0 | 33.3 | 66.7 | | Cavernous dissolution zone | 100.0 | 0 | 0 | 0 | 0 | | Groove (cave) filled zone | 100.0 | 0 | 0 | 0 | 0 |
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