Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 26-37.doi: 10.12108/yxyqc.20220502

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Diagenesis of alkaline lacustrine dolomitic reservoirs of Permian Fengcheng Formation in Mahu Sag

LYU Zhengxiang1, LIAO Zheyuan1, LI Yuefeng1, SONG Xiuzhang1, LI Xiang1, HE Wenjun2, HUANG Liliang2, QING Yuanhua1,3   

  1. 1. College of Energy, Chengdu University of Technology, Chengdu 610059, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. School of History Geography and Tourism, Chengdu Normal University, Chengdu 610021, China
  • Received:2022-04-12 Revised:2022-04-23 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on the data of polarizing microscope identification,scanning electron microscope energy spectrum analysis,inclusion temperature measurement,oxygen isotope analysis,X-ray diffraction and organic geochemical analysis,the diagenesis and diagenetic evolution sequence of alkaline lacustrine dolomitic reservoirs of Permian Fengcheng Formation in Mahu Sag of Junggar Basin were studied. The results show that:(1)The dolomitic reservoirs of Permian Fengcheng Formation in Mahu Sag are typical alkaline lacustrine deposits,and are composed of various dolomitic rocks,which mainly consists of dolomitic tuff and dolomitic sedimentary tuff.(2)Devitrification of dolomitic rocks is common,authigenic minerals mainly consist of siliceous minerals,calcium magnesium carbonate minerals,aluminosilicate minerals and non-calcium magnesium carbonate minerals,dissolution mainly occurs in aluminosilicate minerals and saline minerals,diagenetic fractures and multi-stage structural fractures are generally developed,and hydrocarbon charging exhibits three major stages.(3)Most dolomitic rocks have entered phase A of mesodiagenesis,a few followed by phase B of mesodiagenesis,and devitrification occurred in phase A of eodiagenesis. Authigenic dolomites are formed in three different periods from early to late, and are mostly developed in phase B of eodiagenesis. Non-calcium magnesium carbonate minerals are mainly formed in syndiagenetic stage. Dissolution with three stages is mainly developed in phase A of mesodiagenesis. Hydrocarbon charging began in phase B of eodiagenesis,and kept successive charging for the longest time in phase B of mesodiagenesis. Devitrification,dissolution of feldspar and non-calcium magnesium carbonate minerals,and structural fractures are imperative to the formation of dolomitic reservoirs of Fengcheng Formation in Mahu Sag.(4)The reservoir pores formed by devitrification provide reservoir space for early hydrocarbon charging. The acidic fluid released by thermal evolution of high-quality alkaline lacustrine source rocks dissolved aluminosilicate minerals and saline minerals in dolomitic rocks,which effectively improves reservoir properties.

Key words: alkaline lacustrine deposit, diagenesis, dolomitic reservoir, Fengcheng Formation, Permian, Mahu Sag, Junggar Basin

CLC Number: 

  • TE122.2
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