Geochemical characteristics and diagenetic fluids of dolomite reservoirs in the Huanglong Formation, Eastern Sichuan Basin, China

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• 作者：Huaguo Wen (1) (2)
  Longbin Wen (1) (2)
  Haoru Chen (1) (2)
  Rongcai Zheng (1) (2)
  Lurui Dang (3)
  Yanan Li (1) (2)
  
• 关键词：Dolomite reservoir ; geochemistry ; diagenetic fluids ; Huanglong Formation ; Carboniferous ; Sichuan Basin
• 刊名：Petroleum Science
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：11
• 期：1
• 页码：52-66
• 全文大小：806 KB
• 作者单位：Huaguo Wen (1) (2)
  Longbin Wen (1) (2)
  Haoru Chen (1) (2)
  Rongcai Zheng (1) (2)
  Lurui Dang (3)
  Yanan Li (1) (2)
  
  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan, 610059, China
  2. Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan, 610059, China
  3. Chongqing Gas District of Southwest Oil and Gas Company of CNPC, Chongqing, 400021, China
  
• ISSN：1995-8226

文摘

Based on a comprehensive study of texture, diagenetic behavior and evolution of dolomite in the Huanglong Formation, trace (e.g., Fe, Mn and Sr) and rare earth element (REE) geochemistry, and isotopic characteristics (e.g., C, O and Sr), four types of diagenetic fluids are identified in the Huanglong Formation dolomite reservoirs of the Eastern Sichuan Basin, China: 1): marine-derived pore waters in the marine diagenetic environment, 2) sabkha compaction brine conserved in the early shallow-buried diagenetic environment, 3) strongly-oxidizing low-temperature meteoric water in the seepage-subsurface flow diagenetic environment, and 4) strongly reducing deeply seated mixed hot brine in the middle and deep burial diagenetic environment. The fluids developed hereditarily from one environment to another, which resulted in its respective characteristics. Fluid characteristics play an important role in the development of dolomite reservoirs: 1) dolomitization by marine-derived pore water in the quasi-syngenetic stage did not form an effective reservoir; 2) early diagenetic burial dolomitization by the sabkha compaction brine formed the basis for reservoir development; 3) meteoric water karstification in the paleo-epidiagenetic stage expanded both the distribution and the size of the reservoirs, and improved the reservoir quality; 4) deep-burial dissolution and tectonic fracturing in the reburial diagenetic stage further improved reservoir porosity and permeability.