石英溶解型次生孔隙的成因及其对储层的影响——以大牛地气田上古生界致密砂岩储层为例

doi:10.11743/ogg20150512

Abstract

Abstract: By virtue of polarizing microscope,scanning electron microscope,cathode luminescence microscope,laser scan confocal microscope in combination with X-ray diffraction data and water rock interaction experiment,we studied quartz dissolution in tight sandstone reservoirs in the Upper Paleozoic of Daniudi gas field in Ordos Basin,and summarized the typical morphology features,genesis and its influences on tight sandstone reservoir.Results show that:(1)Quartz dissolution is common and has typical SEM morphology features as “rain print” and “honey comb” solution pits and/or vugs.(2)Quartz dissolution in Daniudigas field develops in alkaline environment,and the detailed evidences are as follows:①hydrothermal experiments verify that quartz dissolves more easily in alkaline environments than in acid conditions;②calcite cementation and metasomatism associated with quartz dissolution are common;③some horizons are rich in illite but poor in kaolinite,with some chlorite coatings occurring sporadically.(3)Quartz alkaline dissolution results in secondary pores such as intergranular dissolution pores and enlarged pores,leading to an average incremental porosity of about 6%.This is the cause of quality reservoirs in some tight sandstone intervals of Daniudi gas field.

Key words: alkaline environment, hydrothermal experiment, quartz dissolution, high quality reservoir, Daniudi gas field

CLC Number:

TE122.2

Qu Xiyu, Chen Xiu, Qiu Longwei, Zhang Manli, Zhang Xiangjin. Genesis of secondary pore of quartz dissolution type and its influences on reservoir: Taking the tight sandstone reservoir in the Upper Paleozoic of Daniudi gas field as an example[J]. Oil & Gas Geology, 2015, 36(5): 804-813.

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Genesis of secondary pore of quartz dissolution type and its influences on reservoir: Taking the tight sandstone reservoir in the Upper Paleozoic of Daniudi gas field as an example

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