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

查看全文 作　　者：Wen [1,2]Huaguo;Wen [1,2]Longbin;Chen [1,2]Haoru;Zheng [1,2]Rongcai;Dang [3]Lurui;Li [1,2]Yanan 高影响力作者 机构地区：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology;[2]Institute of Sedimentary Geology, Chengdu University of Technology;[3]Chongqing Gas District of Southwest Oil and Gas Company of CNPC高影响力机构 出　　处：《Petroleum Science》索引2014年第11卷第1期,共15页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant No.41002033);National Major Science and Technology Specific Project of China(2011ZX05030-003-02);Natural Science Key Project of Education Department in Sichuan(13ZA0058);Foundation for Fostering Middle-aged and Young Key Teachers of Chengdu University of Technology 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. 关 键 词：白云岩储层 地球化学特征 四川盆地东部 成岩流体 黄龙组 中国 成岩环境 油藏开发
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