A new method for recovering paleoporosity of sandstone: case study of middle Es3 member of Paleogene formation in Niuzhuang Sag, Dongying Depression, Bohai Bay Basin in China

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• 作者：Mingjie Liu ; Zhen Liu ; Biao Wang ; Xiaoming Sun ; Jigang Guo
• 关键词：paleoporosity ; binary function ; acidified window ; Niuzhuang Sag ; Bohai Bay Basin
• 刊名：Frontiers of Earth Science
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：9
• 期：3
• 页码：521-530
• 全文大小：891 KB
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• 作者单位：Mingjie Liu (1)
  Zhen Liu (2)
  Biao Wang (3)
  Xiaoming Sun (2)
  Jigang Guo (4)
  
  1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, China
  2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
  3. The Huabei Oilfield Company of PetroChina, Cangzhou, 061023, China
  4. Strategic Research Center of Oil and Gas Resources, Ministry of Land and Resources, Beijing, 100034, China
  
• 刊物主题：Earth Sciences, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-0209

文摘

This paper presents a new method for recovering paleoporosity of sandstone reservoirs and quantitatively defines the evolution process of porosity. This method is based on the principle that the present is the key to the past. We take the middle Es3 member in Niuzhuang Sag, Dongying Depression, and Bohai Bay Basin as an example. The method used in this study considers the present porosity as a constraint condition, and the influences of both constructive diagenesis and destructive diagenesis to divide the porosity evolution process into two independent processes, namely porosity increase and porosity decrease. An evolution model of sandstone porosity can be established by combining both the pore increase and pore decrease effects. Our study reveals that the porosity decrease model is a continuous function of burial depth and burial time, whereas the porosity increase model mainly occurs in an acidified window for paleotemperature of 70°C to 90°C. The porosity evolution process can be divided into the following phases: normal compaction, acidification and pore increase, and post-acidification compaction. Thus, the porosity evolution model becomes a piecewise function of three subsections. Examples show that the method can be applied effectively in recovering the paleoporosity of sandstone reservoirs and simulating the porosity evolution process.