下扬子地区古生界海相碳酸盐岩层序地层发育模式及储层预测

doi:10.11743/ogg20110511

Abstract

Abstract:

According to the principles of sequence stratigraphy and sedimentology,we studied the Paleozoic marine deposits in the Lower Yangtze area by using outcrop observation data integrated with drilling and logging data.We identified four types of unconformities through field observation,including uplifting-erosion unconformity,transgressive onlapping unconformity,underwater erosional unconformity and subareal erosional unconformity.In addition,we also identified 4 types of condensed sections,including the Sinian coal layer,the Silurian-Carboniferous Gaolishan Formation shale,thin Ordovician dolomite and thin Carboniferous limestone.According to these boundary marks,11 second-order sequences were recognized and a sequence stratigraphic framework was established in the Lower Yangtze area.According to the lithologies,facies and sedimentary structures defined through field outcrop observation,we established three sedimentary systems for the Paleozoic in the study area, namely continental sedimentary system,transition sedimentary system and ocean sedimentary system.Finally,based on the regional tectonic setting and previous research results,we studied the nature and evolution of basin in the study area.Three sequence stratigraphic models were established,i.e. the Sinian-Late Ordovician,Devonian and Carboniferous stratigraphy model of craton basin,the latest Ordovician-Late Silurian stratigraphy model of foreland basin and the Middle and Late Ordovician,Late Permian-Middle Triassic stratigraphy model of passive margin basin.Their sequence characteristics were summarized.

Key words: sequence model, sedimentary system, marine strata, carbonate rock, sequence stratigraphy, Paleozoic, Lower Yangtze area

CLC Number:

TE121.3

Ji Youliang, Zhou Yong, Wang Gaiwei, Lu Linlin. Sequence stratigraphic models and reservoir prediction of the Paleozoic marine carbonates in the Lower Yangtze area[J]. Oil & Gas Geology, 2011, 32(5): 724-732,786.

References

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Sequence stratigraphic models and reservoir prediction of the Paleozoic marine carbonates in the Lower Yangtze area

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