High resolution sequence stratigraphic and reservoir characterization studies of D-07, D-08 and E-01 sands, Block 2 Meren field, offshore Niger Delta

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Title: High resolution sequence stratigraphic and reservoir characterization studies of D-07, D-08 and E-01 sands, Block 2 Meren field, offshore Niger Delta
Author: Esan, Adegbenga Oluwafemi
Abstract: Meren field , located offshore Niger Delta , is one of the most prolific oil -producing fields in the Niger Delta . The upper Miocene D -07 , D -08 and E -01 oil sands comprise a series of stacked hydrocarbon reservoirs in Block 2 of Meren field . These reservoir sandstones were deposited in offshore to upper shoreface environments . Seven depositional facies were identified in the studied interval , each with distinct lithology , sedimentary structures , trace fossils , and wire -line log character . The dominant lithofacies are (1 ) locally calcite -cemented highly -bioturbated , fine -grained sandstones , (middle to lower shoreface facies ) ; (2 ) cross -bedded , fine - to medium -grained well -sorted sandstones (upper shoreface facies ) ; (3 ) horizontal to sub -horizontal laminated , very -fine - to fine -grained sandstone (delta front facies ) ; (4 ) massive very -fine - to fine -grained poorly -sorted sandstone (delta front facies ) ; (5 ) muddy silt - to fine -grained wavy -bedded sandstone (lower shoreface facies ) ; (6 ) very -fine - to fine -grained sandy mudstone (lower shoreface facies ) ; and (7 ) massive , silty shales (offshore marine facies ) . Lithofacies have distinct mean petrophysical properties , although there is overlap in the range of values . The highest quality reservoir deposits are cross -bedded sands that were deposited in high -energy upper shoreface environments . Calcite cements in lower shoreface facies significantly reduce porosity and permeability . Integration of core and wire -line log data allowed porosity and permeability to be empirically determined from bulk density . The derived equation indicated that bulk density values could predict 80 % of the variance in core porosity and permeability values . Three parasequence sets were interpreted , including one lower progradational and two upper retrogradational parasequence sets . The progradational parasequence set consists of upward -coarsening delta front to upper shoreface facies , whereas the upward -fining retrogradational parasequence sets are composed of middle to lower shoreface deposits overlain by offshore marine shales . The limited amount of core data and the relatively small area of investigation place serious constraints on stratigraphic interpretations . Two possible sequence stratigraphic interpretations are presented . The first interpretation suggests the deposits comprise a highstand systems tract overlain by a transgressive systems tract . A lowstand systems tract is restricted to an incised valley fill at the southeastern end of the study area . The alternate interpretation suggests the deposits comprise a falling stage systems tract overlain by transgressive systems tract .
URI: http : / /hdl .handle .net /1969 .1 /234
Date: 2004-09-30

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High resolution sequence stratigraphic and reservoir characterization studies of D-07, D-08 and E-01 sands, Block 2 Meren field, offshore Niger Delta. Available electronically from http : / /hdl .handle .net /1969 .1 /234 .

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