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
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作者机构：School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum (Beijing) Beijing 102249 China The Huabei Oilfield Company of PetroChina Cangzhou 061023 China Strategic Research Center of Oil and Gas Resources Ministry of Land and Resources Beijing 100034 China
出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)
年 卷 期：2015年第9卷第3期
页 面：521-530页
核心收录：
学科分类：081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 070102[理学-计算数学] 0701[理学-数学]
基 金：supported by the Young Scholars Development Fund of SWPU
主 题：paleoporosity binary function acidified window Niuzhuang Sag Bohai Bay Basin
摘 要：This paper presents a new method for recover- ing paleoporosity of sandstone reservoirs and quantita- tively 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 paleo- temperature of 70℃ to 90℃. 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.
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