Early-diagenetic Carbonate Nucleation Cementation in Cenozoic Sandstones,Northern Tarim Basin：Evidences from High-resolution Electric Borehole Images

ZHONG Guang fa; MA Zai tian

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Article Navigation > Acta Sedimentologica Sinica > 2001 > 19(2): 239-244

ZHONG Guang fa, MA Zai tian. Early-diagenetic Carbonate Nucleation Cementation in Cenozoic Sandstones,Northern Tarim Basin：Evidences from High-resolution Electric Borehole Images[J]. Acta Sedimentologica Sinica, 2001, 19(2): 239-244.

Citation:

Early-diagenetic Carbonate Nucleation Cementation in Cenozoic Sandstones,Northern Tarim Basin：Evidences from High-resolution Electric Borehole Images

Laboratory of Marine Geology of China Ministry of Education, Tongji University,Shanghai 200092

Received Date: 2000-04-19
Rev Recd Date: 2000-07-03

Abstract

Carbonate ccmcntation is the main diagcnctic process except for compaction in shallow-burial(shallower than 700 metcrs) Ncogcnc-Quatcrnarv fluvial sandstoncs of northern Tarim Basin.High-resolution electric borcholc images provide valuable information on the gcomctrv and occurrence of carbonate concretions in these sandstoncs. Carbonate concretions in the sandstoncs are characterized with white high-resistive features in both static and dynamic images.The shape of these concretions is round clliptoid or irregular. They may occur as isolate patches scattered in poorcemented sandstones, or appear in group as spiccato or continuous carbonate-cemented laminae intcrbcddcd with poor-cemcntcd sandstone laminae. Strong selectivity of carbonate ccmcntation at different scales is observed on the images of these sandstoncs.On scale of sandstone beds, carbonate concretions preferentially developed at the upper and/or lower parts, where ion materials needed for carbonate cement precipitation are believed to be more easily available from adjacent clay sediments.On scale of beddings,carbonate concretions usually aligned parallel to bedding surfaces.In most cases, they intcrbcddcd with poor-ccmcnted sandstone laminae as spiccato or continuous carbonate-cemented laminae which may be resulted from the texture and hence permeability differences between laminae.On laminae scale, carbonate cements selectively precipitate around some nuclei then enlarge outwards as cemented patches.when the patches grow closer or merge together spiccato or continuous cemented laminae form. fragments, which are the The selectivity of ccmcntation some relation to the,listrihution of elastic carbonate common gram components in these sandstones. Based on interpertation of electric images,this paper concluded a growth of early-diagenetic carbonate cements in these sandstoncs.They were developed following the sequences from the top and/or the middle of the sandstone beds, from high-permeable laminae to low-permeable laminae, and from some local nuclei to their vicinity.
- sandstone,
- cementation,
- carbonate mineral,
- electric borehole imaging,
- Tarim basin

References

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Early-diagenetic Carbonate Nucleation Cementation in Cenozoic Sandstones,Northern Tarim Basin：Evidences from High-resolution Electric Borehole Images

Laboratory of Marine Geology of China Ministry of Education, Tongji University,Shanghai 200092

Received Date: 2000-04-19

Rev Recd Date: 2000-07-03

Key words:

Abstract: Carbonate ccmcntation is the main diagcnctic process except for compaction in shallow-burial(shallower than 700 metcrs) Ncogcnc-Quatcrnarv fluvial sandstoncs of northern Tarim Basin.High-resolution electric borcholc images provide valuable information on the gcomctrv and occurrence of carbonate concretions in these sandstoncs. Carbonate concretions in the sandstoncs are characterized with white high-resistive features in both static and dynamic images.The shape of these concretions is round clliptoid or irregular. They may occur as isolate patches scattered in poorcemented sandstones, or appear in group as spiccato or continuous carbonate-cemented laminae intcrbcddcd with poor-cemcntcd sandstone laminae. Strong selectivity of carbonate ccmcntation at different scales is observed on the images of these sandstoncs.On scale of sandstone beds, carbonate concretions preferentially developed at the upper and/or lower parts, where ion materials needed for carbonate cement precipitation are believed to be more easily available from adjacent clay sediments.On scale of beddings,carbonate concretions usually aligned parallel to bedding surfaces.In most cases, they intcrbcddcd with poor-ccmcnted sandstone laminae as spiccato or continuous carbonate-cemented laminae which may be resulted from the texture and hence permeability differences between laminae.On laminae scale, carbonate cements selectively precipitate around some nuclei then enlarge outwards as cemented patches.when the patches grow closer or merge together spiccato or continuous cemented laminae form. fragments, which are the The selectivity of ccmcntation some relation to the,listrihution of elastic carbonate common gram components in these sandstones. Based on interpertation of electric images,this paper concluded a growth of early-diagenetic carbonate cements in these sandstoncs.They were developed following the sequences from the top and/or the middle of the sandstone beds, from high-permeable laminae to low-permeable laminae, and from some local nuclei to their vicinity.

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Early-diagenetic Carbonate Nucleation Cementation in Cenozoic Sandstones,Northern Tarim Basin：Evidences from High-resolution Electric Borehole Images

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