Analysis on the Characteristics and Variations of Member 1 of the Qingshuihe Formation in the Luxi Region

doi:10.11885/j.issn.1674-5086.2016.07.12.62

Abstract

Abstract:

To elucidate the reservoir characteristics and controlling factors of Member 1 of the Qingshuihe Formation (Qingshuihe Member 1), which lies to the west of the Luliang uplift, and to guide the prospecting of "sweet spots" in the reservoir, a comparative analysis between the sandstone and glutenite reservoirs of Qingshuihe Member 1 was performed through the analysis of a large numbers of rock thin-sections and casting thin-sections via scanning electron microscopy and X-ray diffraction, combined with the analysis of rock core observations, petrophysical properties, and mercury porosimetry. Significant differences were found between the microscopic and macroscopic characteristics of these reservoirs. (1) Sandstone reservoirs are mainly comprised of medium-to-fine grained feldspar lithic sandstones that are primarily distributed within the northwestern side of the research area, whereas glutenite reservoirs are mainly composed of fine conglomerate and sandy fine conglomerate that are mainly distributed in the northeastern side of the research area. (2) Reservoir spaces in sandstone are mainly comprised of primary pores, with plagioclase dissolution pores supplementing these spaces, whereas the main reservoir space in glutenite is comprised of intergranular calcite dissolution pores. (3) The average porosity of sandstone and glutenite reservoirs are 14% and 11%, respectively, indicating that sandstone reservoirs have better petrophysical properties than glutenite reservoirs. However, glutenite reservoirs have better pore-throat structures, as most of their pores are large and have coarse skewness. (4) Sandstones are strongly affected by compaction. The tectonically elevated Hedao sandstones in the north (e.g. the Xiayan-8 well) experienced weaker levels of compaction due to their shallow burial depths, and thus have better petrophysical properties. Intense carbonate cementation during the early stages of glutenite reservoir development led to the compaction of these reservoirs, and the petrophysical qualities of these reservoirs are determined by the effects of dissolution around locations where such faults developed.

Key words: Luxi region, Member 1 of the Qingshuihe Formation, sandstones, glutenite, reservoir characteristics, controlling factors

CLC Number:

TE122

WANG Jian. Analysis on the Characteristics and Variations of Member 1 of the Qingshuihe Formation in the Luxi Region[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 22-34.

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