A Discussion on Distribution Pattern and Genesis of the Calcareous
Intercalation in Delta Front Reservoir

doi:10.11885/j.issn.1674-5086.2012.05.16.02

Abstract

Abstract:

By using of core and close spacing log information，the lithologic features and log response features of the calcareous
intercalation in delta front reservoir of Shengtuo Oilfield were proposed systematically. on that basis，we recognize
the distribution pattern of calcareous intercalation in high-resolution sequence stratigraphic framework based on the accurate
strata correlation. The biogenesis mechanism was presented to improve the genetic model of calcareous intercalation. The
study shows that the distribution of calcareous intercalations has selectivity，which is always in the top of sandbody formed in
short-term downward base level cycle. The extension scale of calcareous intercalation in strata profile is not big，and always
transits to be muddy or silty depositional interface，which shows the calcareous intercalation as an approved sequence interface
or subdivision interface of composite sandbody in the delta front reservoir. The areal distribution of the calcareous intercalation
is correlated with the depositional microfacies，which is selectively located in the regional debouch bar near the subaqueous
distributary channel in a single depositional unit，and presented as separate lump shape. The intensive tulotomoides terrassa are
found in the calcareous intercalation，and the subsistence and aggregation patterns of tulotomoides terrassa coincided with the
selective distribution pattern of calcareous intercalation，which indicates the biogenesis mechanism.

Key words: delta front, calcareous intercalation, distribution pattern, tulotomoides terrassa, biogenesis mechanism

Yan Ke1，2, Zhao Hongbing1. A Discussion on Distribution Pattern and Genesis of the Calcareous
Intercalation in Delta Front Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.05.16.02.

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