Petrography and geochemistry of sandstone samples of Vischkuil formation, Karoo Supergroup, South Africa

被引：6

作者：

Akinlua A. ^{[1
,2
]}

Ngola A. ^{[1
]}

Fadipe O.A. ^{[1
]}

Adekola S.A. ^{[1
,3
]}

机构：

[1] Department of Earth Sciences, University of the Western Cape, PMB X17, Bellville, 7535, Cape Town

[2] Fossil Fuels and Environmental Geochemistry Group, Department of Chemistry, Obafemi Awolowo University, Ile-Ife

[3] Department of Geology, Obafemi Awolowo University, Ile-Ife

来源：

Journal of Petroleum Exploration and Production Technology | 2016年 / 6卷 / 2期

关键词：

Geochemistry; Karoo; Petrography; Reservoir rock; Sandstone; Vischkuil formation;

D O I：

10.1007/s13202-015-0199-1

中图分类号：

学科分类号：

摘要：

Petrography and geochemistry of sandstones of Vischkuil formation in the Ecca Group of the Karoo Supergroup of South Africa was investigated to evaluate the petroleum potential of its reservoir rock. The petrographic analysis showed that the sandstones were poorly to moderately sorted with evidence of angular to sub-angular grains. The sandstones are lithic arenite. Diagenetic processes on the sandstone include physical and chemical compaction as seen from the straight grain contacts and dissolution of the quartz grains. There is an evidence of pore space reduction by the rearrangement and cementation by silica, calcite and clay minerals. The petrographic analysis also revealed that there is dominance of monocrystalline quartz grains and evidence of cratonic setting derivation. The chemical alteration index ranged from 52.96 to 65.5 %, an indication of a moderate weathering at the source area before deposition. The samples are texturally immature, which indicate poor storage capacity for fluids. © 2015, The Author(s).

引用

页码：159 / 167

页数：8

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