Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (3): 49-54.doi: 10.3969/j.issn.1673-8926.2011.03.010

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Characteristics and evaluation of carbonate buried hill inner cap rock in Jizhong Depression

WU Xingning 1， 2， LV Yuzhen1， TIAN Jiqiang2， GUO Yongjun3   

  1. 1. Research Institute of Petroleum Exploration & Development-Hangzhou， PetroChina， Hangzhou 310023， China； 2. Research Institute of Petroleum Exploration & Development， PetroChina， Beijing 100083， China； 3. Research Institute of Exploration and Development， Huabei Oilfield Company， PetroChina， Renqiu 062552， China
  • Online:2011-06-20 Published:2011-06-20

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Abstract:

Based on the observation of core and thin section, experimental analysis and well logging interpretation, it is considered that Yangzhuang Formation, Hongshuizhuang Formation and Mantou Formation are the main carbonate buried hill inner cap rocks fromChangcheng systemto Ordovician in Jizhong Depression. The lithology of the cap rock is mainly argillaceous rock, followed by argillaceous dolomite, argillaceous limestone and dense dolomite or limestone. Both the porosity and permeability are low. The essential macroscopical controlling factors for the cap rock are lithology, shale content and distribution scale, while the microcosmic controlling factors are breaking pressure, porosity and permeability, envelop coefficient etc. Based on the above factors, the carbonate buried hill inner cap rock in Jizhong Depression is divided into four types. Yangzhuang Formation is evaluated as type Ⅲ （middling cap rock）, Hongshuizhuang Formation is evaluated as typeⅡ （better cap rock）, andMantou Formation is evaluated as typeⅠ（best cap rock）.

Key words: one point method well testing, absolute open flow, error, correction, Tainan Gasfield

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