Revisiting the Compaction Time of Chang 8 Sandstones in Southwestern Ordos Basin

doi:10.11885/j.issn.1674-5086.2017.01.24.02

Abstract

Abstract: Owing to disagreements in the understanding of calcite cement formation, the compaction time of sandstones of the Yanchang Formation in Ordos Basin has not yet been determined. Employing scanning electron microscopy (SEM) with energy spectrometry and casted rock thin sections, the origin of calcite cement in Chang 8 sandstones in southwestern Ordos Basin was investigated. The results show that water released from mudstone compaction during phase A of the early diagenetic stage induced calcite cementation, forming type I calcite cement with evenly distributed dissemination structures or type Ⅱ⁰ with patchy or scattered dissemination structures. Fluids cannot easily penetrate sandstones derived from type I calcite cementation, and thus water-rock reactions cannot take place. Type Ⅱ⁰ calcite cement is transformed into type Ⅱ via dissolution-precipitation during phase A of the mid-diagenetic stage. Carbon and oxygen isotopes and fluid inclusion data cannot be used as the main reference for studying calcite cement formation because their interpretation must follow rock microstructure characteristics. In view of the above, the compaction time of Chang 8 sandstones in southwestern Ordos Basin was determined to be phase A of the early diagenetic stage, and its relationship with reservoir formation is "compaction followed by accumulation."

Key words: compaction time, calcite cement, microstructure, compaction followed by accumulation, Yanchang Formation, Ordos Basin

CLC Number:

TE122

ZHOU Xiaofeng, LI Jing, ZHANG Jianxin, LI Shuheng, YU Junmin. Revisiting the Compaction Time of Chang 8 Sandstones in Southwestern Ordos Basin[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 1-10.

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