Effects of Compaction and Cementation on the Chang 8 Member Reservoir in the Ordos Basin

doi:10.11885/j.issn.1674-5086.2017.07.28.01

Abstract

Abstract: To investigate the effects of compaction and cementation on the porosity of the Chang 8 Member reservoir in the Ordos Basin, the reservoir was divided into five systems according to their regions. Methods in mineralogy, petrology, and statistics were employed to systematically study compaction and cementation. The degree of compaction and cementation, porosity variations, and correlations between compaction and cementation were quantitatively calculated. The results demonstrate that compaction was characterized by early rapid subsidence and prolonged burial, while cementation, including silicon and carbonate cementation, occurred throughout the entire diagenesis process. Statistics for the degree of compaction indicate that the reservoir is moderately to strongly compacted. The porosity loss of each system due to compaction in the Chang8¹ Member vary in descending order as:northeast > northwest > south > southwest > west, whereas that of the Chang 8² Member vary as northwest > west > southwest > northeast > south. The porosity losses resulting from compaction are > 19% on average. Statistics of the degree of cementation reveal that the reservoir is weakly to moderately cemented, and the porosity losses caused by cementation are in the 11%~16% range. The porosity loss of each system in the Chang 8¹ Member due to cementation vary in descending order as west > northeast > northwest > south > southwest, while that of the Chang 8² Member vary as:northeast > south > west > southwest > northwest. Compaction leads to greater porosity losses than cementation, and is the main destructive factor to physical properties of the Chang 8 Reservoir in the Ordos Basin.

Key words: compaction, cementation, geothermal gradient, degree of compaction, degree of cementation, porosity loss

CLC Number:

TE122

WANG Zhao, QIU Junli. Effects of Compaction and Cementation on the Chang 8 Member Reservoir in the Ordos Basin[J]. 西南石油大学学报(自然科学版), 2018, 40(6): 56-68.

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