Petroleum Science > 2018(1 ) :52-66 DOI:
Geochemical characteristics and diagenetic fluids of dolomite reservoirs in the Huanglong Formation, Eastern Sichuan Basin, China Open Access
文章信息
作者：Dolomite reservoir, geochemistry, diagenetic fluids, Huanglong Formation, Carboniferous, Sichuan Basin
作者单位：Wen Huaguo, Wen Longbin, Chen Haoru, Zheng Rongcai, Dang Lurui and Li YananState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan 610059, China and Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan 610059, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan 610059, China and Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan 610059, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan 610059, China and Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan 610059, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan 610059, China and Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan 610059, China,Chongqing Gas District of Southwest Oil and Gas Company of CNPC, Chongqing 400021, China and State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan 610059, China and Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan 610059, China
收稿日期：
出版日期：2012-11-04 00:00:00.0
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文章摘要
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 shallowburied diagenetic environment, 3) strongly-oxidizing low-temperature meteoric water in the seepagesubsurface 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 quasisyngenetic 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.
英文关键词
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Dolomite reservoir, geochemistry, diagenetic fluids, Huanglong Formation, Carboniferous, Sichuan Basin