Quantification and timing of porosity evolution in tight sand gas reservoirs: an example from the Middle Jurassic Shaximiao Formation, western Sichuan, China

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• 作者：Zheng-Xiang Lü ; Su-Juan Ye ; Xiang Yang ; Rong Li ; Yuan-Hua Qing
• 关键词：Diagenesis ; Porosity evolution ; Tight gas sandstones ; Jurassic ; Western Sichuan
• 刊名：Petroleum Science
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：12
• 期：2
• 页码：207-217
• 全文大小：1,868 KB
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• 作者单位：Zheng-Xiang Lü (1)
  Su-Juan Ye (2)
  Xiang Yang (1)
  Rong Li (3)
  Yuan-Hua Qing (1) (4)
  
  1. State Key Laboratory of Oil and Gas Reservoir Geology & Exploitation, Chengdu University of Technology, Chengdu, 610059, Sichuan, China
  2. Exploration and Production Research Institute, Sinopec Southwest, Chengdu, 610041, Sichuan, China
  3. Chengdu Institute of Geology and Mineral Resources, Chengdu, 610081, Sichuan, China
  4. PetroChina Tarim Oilfield Company, Korla, 841000, Xinjiang, China
  
• 刊物主题：Mineral Resources; Industrial Chemistry/Chemical Engineering; Industrial and Production Engineering; Energy Economics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1995-8226

文摘

The diagenesis and porosity evolution of the Middle Jurassic Shaximiao sandstones were analyzed based on petrographic observations, X-ray diffractometry, scanning electron microscopy observations, carbon and oxygen stable isotope geochemistry, fluid inclusion microthermometry, and thermal and burial history modeling results. The point count data show that secondary pores (av. 5.5?%) are more abundant than primary pores (av. 3.7?%) and are thus the dominant pore type in the Shaximiao sandstones. Analysis of porosity evolution indicates that alteration of sandstones mainly occurred during two paragenetic stages. Mechanical compaction and cementation by early chlorite, calcite, and quartz typically decrease the depositional porosity (40.9?%) by an average of 37.2?%, leaving porosity of 3.7?% after stage I (<85?°C, 175-45?Ma). The original intergranular porosity loss due to compaction is calculated to be 29.3?%, suggesting that mechanical compaction is the most significant diagenetic process in primary porosity destruction. Stage II can be further divided into two sub-stages (Stage II_a and Stage II_b). Stage II_a (85-20?°C, 145-25?Ma) is characterized by late dissolution, which enhanced porosity by 8.8?%, and the porosity increased from 3.7?% to 12.5?%. During stage II_b (>120?°C, 125-?Ma), the precipitation of late chlorite, calcite, quartz, and kaolinite destroyed 3.3?% porosity, leaving porosity of 9.2?% in the rock today.