Characteristics and Controlling Factors of Dolomite Reservoirs in the Ma55 Sub-member of Ordovician in Majiagou, Ordos Basin

doi:10.11885/j.issn.1674-5086.2015.09.07.01

Abstract

Abstract: In this study, we analyzed the characteristics and controlling factors of dolomite reservoirs based on core survey, well logging analysis, thin section and SEM identification, and analysis of physical properties. We found that the reservoir rock mainly consists of siltcrystal dolomites and siltcrystal-micrite dolomites. The main types of reservoir spaces are intercrystalline pores and dissolution pores-caves with low porosity and low permeability. At Ma5₅, dolomitic flat, lime mud depression, dolomitic depression, and dolomitic-lime mud depression facies are developed. The dolomite belt of the dolomitic flat is controlled by sedimentary microfacies, with the thickest dolomites of the best physical properties widely distributed in Jinbian County. The location of high quality reservoir is controlled by dolomitization:some intercrystal micro-pores were formed by penecontemporaneous dolomitization; intercrystal pores were formed after penecontemporaneous dolomitization; and intercrystal pores and emposieu by buried dolomitization. Reservoir effectiveness is controlled by dolomitization subfacies; the best subfacies are boundary-interim subfacies. Most reservoir spaces formed by epigenic karstification and burial dissolution are filled by vadose silt, calcite, and quartz.

Key words: Ordos Basin, Ma5₅ sub-member, Ordovician Majiagou Formation, dolomite reservoir, reservoir characteristics, controlling factors

CLC Number:

TE121

YANG Xiyan, BAO Hongping, REN Junfeng, MA Zhanrong. Characteristics and Controlling Factors of Dolomite Reservoirs in the Ma5₅ Sub-member of Ordovician in Majiagou, Ordos Basin[J]. 西南石油大学学报(自然科学版), 2017, 39(2): 27-34.

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Characteristics and Controlling Factors of Dolomite Reservoirs in the Ma5₅ Sub-member of Ordovician in Majiagou, Ordos Basin

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