Dissolution characteristics of deep?buried dolostone in the Member 5 of Ordovician Majiagou Formation in southern Ordos Basin
Lei Han1, 2, 3, Huang Wen-Hui1, 2, 3, Yi Shuo1, 2, 3, Wang Ya-Ting1, 2, 3
1. School of Energy Resources, China University of Geosciences, Beijing100083, China; 2. Key Laboratory for Marine Reservoir Evolution, Hydrocarbon Abundance Mechanism, China University of Geosciences, Beijing100083, China; 3. Beijing Key Laboratory of Unconventional National Gas Geology Evaluation, Development Engineering, China University of Geosciences, Beijing100083, China
Abstract：The different types of deep-buried dissolution process in the Member 5 of Ordovician Majiagou Formation in the southern Ordos Basin and its influence on the reservoir properties are studied in this paper. It shows that three types of mechanisms include organic acid fluid, hydrothermal fluid and TSR are identified through studies of core observation, thin section analysis, inclusion temperature, trace elements and rare earth elements. It is found that the dissolution of organic acid fluid causes the stratified dissolution pores, film-like asphaltene and ring-like asphaltene, while hydrothermal fluid causes the non-selective dissolution pores without petrofabric, veins of pyrites, massive pyrites and the association of hypothermal minerals. Four occurrence models of dissolution include, (1) the deep-buried dissolution of low-temperature hydrothermal fluid occurs in Zhiluo Period of Middle Jurassic; (2) the deep-buried dissolution of organic acid fluid started from the late Middle Jurassic followed by the first hydrocarbon injection; (3) the deep-buried dissolution of middle-high temperature hydrothermal fluid occurred in the Dongsheng Period of Early Cretaceous; (4) TSR occurred at the end of Early Cretaceous with the second larger hydrocarbon injection. Both organic acid fluid and hydrothermal fluid can improve the porosity and permeability of reservoir, but the hydrothermal fluid is more effective than that of organic acid fluid.
Lei Han,Huang Wen-Hui,Yi Shuo et al. Dissolution characteristics of deep?buried dolostone in the Member 5 of Ordovician Majiagou Formation in southern Ordos Basin[J]. JOPC, 2020, 22(6): 1041-1054.
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