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Volume 39 Issue 1
Jan.  2020
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Article Navigation >  Bulletin of Geological Science and Technology  > 2020  >  39(1): 130-136
Cai Zhongxian, Yu Congling, Yang Haijun, Zhang Haizu, Yuan Yuchun. Distribution and differential entrapment mechanism of the oil-water interface within Ordovican in the west part of Lungu buried hill oil field[J]. Bulletin of Geological Science and Technology, 2020, 39(1): 130-136. doi: 10.19509/j.cnki.dzkq.2020.0114
Citation: Cai Zhongxian, Yu Congling, Yang Haijun, Zhang Haizu, Yuan Yuchun. Distribution and differential entrapment mechanism of the oil-water interface within Ordovican in the west part of Lungu buried hill oil field[J]. Bulletin of Geological Science and Technology, 2020, 39(1): 130-136. doi: 10.19509/j.cnki.dzkq.2020.0114
shu

Distribution and differential entrapment mechanism of the oil-water interface within Ordovican in the west part of Lungu buried hill oil field

doi: 10.19509/j.cnki.dzkq.2020.0114
  • Received Date: 09 Dec 2019
    Abstract
  • The distribution of oil-water interface in the west part of Lungu buried hill oil field is very complicated because of its heterogeneity of karst-modified carbonate reservoir.In this study, we use some methods including geomorgraphy and the seismic attribute extraction techniques to sub-divided the river rank of fluviokarst, then perform the trend surface analysis for different rank of rivers to grade the karst monadnock.We also use direct, static pressure crosscoupling and the original formation pressure methods to calculate the oil-water interface of each well.The corrletion between trend surface to oil-water interface of wells shows that the first- and second-grade trend surface influence the distribution of oil-water interface in different monadnock.From Lungun 15 well area in southwest to Lungun 9 well area of middle part, The oil-water interface rise from the first- to second-grade trend surface of monadnock, influenced by fault which resulted in complicated oil-water interface of some wells.This distribution characteristics can not be completely explained by classical theory of differential entrapment because of its reservoir heterogeneity besides spill-point determined from karst river valley.High hydrocarbon-producing well tend to be controlled by the first-grade trend surface of monadnock.

     

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