Paleoporosity and critical porosity in the accumulation period and their impacts on hydrocarbon accumulation—A case study of the middle Es3 member of the Paleogene formation in the Niuzhuang Sag, Dongying Depression, Sout

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• 作者：Mingjie Liu ; Zhen Liu ; Xiaoming Sun ; Biao Wang
• 关键词：Paleoporosity ; critical porosity ; dominant migration pathways ; hydrocarbon accumulation ; middle Es3 member ; Niuzhuang Sag ; Bohai Bay Basin
• 刊名：Petroleum Science
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：11
• 期：4
• 页码：495-507
• 全文大小：2,441 KB
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• 作者单位：Mingjie Liu (1)
  Zhen Liu (2)
  Xiaoming Sun (2)
  Biao Wang (3)
  
  1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
  2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
  3. Research Institute of Geophysical Exploration of Huabei Oilfield, CNPC, Cangzhou, Hebei, 062550, China
  
• ISSN：1995-8226

文摘

Similar reservoir sandbodies and fault conduit systems in the sandstone reservoirs in the middle Es3 member of the Niuzhuang Sag have been problematic for a long time. The following problems remain unsolved: 1) The distribution of sandstone porosity is inconsistent with the hydrocarbon accumulation. The oil sandstones have low porosity instead of high porosity. 2) Sandstones, which have the same properties, have different levels of oiliness, and the sandstones with almost the same properties show different degrees of oil-bearing capacity. This study analyzes the condition of reservoirs in the research area during the accumulation period in terms of paleoporosity estimation and discusses the critical porosity of the sandstone reservoirs during the same period. The following conclusions can be drawn from the results. 1) Although reservoir properties are low at present and some reservoirs have become tight, the paleoporosity ranging from 18% to 25% is greater than the critical porosity of 13.9%. As the loss of porosity is different in terms of burial history, the present porosity cannot reflect porosity during the accumulation period. Similarly, high porosity during the accumulation period does not indicate that the present porosity is high. 2) The present reservoir location is consistent with the distribution of high paleoporosity during the accumulation period. This result indicates that high porosity belts are prone to hydrocarbon accumulation because of the dominant migration pathways generated as a result of property discrepancies under similar fault conduit conditions. Consequently, the hydrocarbon mainly accumulates in high porosity belts. Paleoporosity during the accumulation period is found to be a vital controlling factor. Therefore, high paleoporosity sandstones in the middle Es3 member of the Niuzhuang Sag have great potential for future exploration.