Selective dissolution of eodiagenesis cements and its impact on the quality evolution of reservoirs in the Xing’anling Group, Suderte Oil Field, Hailar Basin, China

• DOI: 10.1007/s12182-016-0110-9
• Publication Date: 2016-07-30T05:32:01Z
• Authors: Zhen-Zhen Jia; Cheng-Yan Lin; Li-Hua Ren; Chun-Mei Dong
• Keywords: Fuel Technology; Geophysics; Geochemistry and Petrology; Energy Engineering and Power Technology; Economic Geology; Geology; Geotechnical Engineering and Engineering Geology; 01 natural sciences; 6. Clean water; 0105 earth and related environmental sciences

Reservoirs in the Xing’anling Group Suderte Oil Field, Hailar Basin exhibit ultra-low to low permeability and high tuffaceous material content. This study comprehensively analyzed diagenesis quality evolution of these low-permeability reservoirs using thin sections, SEM samples, rock physical properties, pore water data, as well geochemical numerical simulations. Calcite analcite are two main types cements precipitated eodiagenetic stage at shallow burial depths reservoirs. These occupied significant primary intergranular pores effectively retarded deep compaction. Petrography textures suggest selective dissolution massive little calcite mesodiagenetic stage. Chemical calculations utilizing Geochemist’s Workbench 9.0 indicated that equilibrium constant leaching reaction is significantly smaller than reaction, resulting extensive rather system with both minerals present. Numerical simulations constraints kinetics chemistry demonstrated group saturated respect calcite, but undersaturated analcite, leading large amounts no calcite. Significant secondary have formed analcite-cemented from stage; preferential flow paths reservoirs, which promoted feldspar dissolution; such led present medium porosity permeability. Calcite-cemented tight not experienced cements, so they