Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (3): 10-19.doi: 10.12108/yxyqc.20190302

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Carbonate cements and its effect on reservoir property of shallow marine sandstones of Zhuhai Formation in Panyu low-uplift,Pearl River Mouth Basin

DU Guichao1, SU Long2, CHEN Guojun2, ZHANG Gongcheng3, DING Chao1, CAO Qing1, LU Yuexin1   

  1. 1. College of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. CNOOC Research Institute Co., Ltd., Beijing 100028, China
  • Received:2018-11-16 Revised:2019-02-15 Online:2019-05-21 Published:2019-05-06

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Abstract: Based on a series of testing method of porosity & permeability measurements, mercury porosimetry measurements, thin section analyses, SEM observations and X-ray diffraction (XRD) analysis, diagenetic features and reservoir property of marine sandstones acquired from Zhuhai Formation in Panyu low-uplift of Pearl River Mouth Basin were analyzed. The results show that three stages of carbonate cements were identified in the studied reservoir sandstones, which was present by calcite and ferro-dolomite in syn-diagenesis, calcite, ferrodolomite and siderite in eodiagenesis, and a small amount of calcite and ferro-dolomite in A stage of eodiagenesis. Early calcite and ferro-dolomite precipitated basally within pore spaces formed supersaturated pore fluid in alkaline environment early in diagenetic history. The second stage of carbonate cements were characterized by porous cementation, and their sources include dissolution of bio-clasts, hydration of Aluminum silicate minerals, and residual pore fluid. In A1 stage of meso-diagenesis, diagenetic environment has been transformed into alkaline when acid fluid was exhausted. The third stage of carbonate cements precipitated when abundant Ca2+, Mn2+, Fe2+ and Mg2+ were dissolved and entered into pore fluid in relatively deeper burial depth, higher temperature and pressure. Carbonate cement is one of the most important factors that caused great loss of reservoir property in the studied reservoir sandstones, showing that the higher content of carbonate cements occurred, the poorer of the reservoir property is. Most obviously, early carbonate cements occurred basally and highly reduced reservoir property. The second stage of carbonate cements generally were featured by porous cementation and blocked the pore spaces. Late carbonate cements generally have a low content, but occurred as replacements of detrital grains or pore fillings in intergranular pores and dissolution pores, which caused further densification of reservoir sandstones. The results can provide a basis for the prediction of favorable zones and the evaluation of exploration targets in this area.

Key words: carbonate cement, diagenesis, reservoir property, Zhuhai Formation, Panyu low-uplift, Pearl River Mouth Basin

CLC Number: 

  • TE122.2
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