Diagenetic history of the Surma Group sandstones (Miocene) in the Surma Basin, Bangladesh

Rahman, M. Julleh Jalalur; McCann, Tom

doi:10.1016/j.jseaes.2011.09.019

Cited by 54 publications

(36 citation statements)

References 29 publications

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“…Porosity, hydrocarbon saturation and movability index values of the selected hydrocarbon zones also advocate in favor of good to very good reservoir condition in the Bengal Basin. This interpretation is also supported from different reports (Imam 2013;Islam 2009and 2010Rahman and McCann, 2012. The identified zone 4 (2668-2731 m) is the most potential hydrocarbon bearing zone based on its porosity.…”

Section: Bulk Volume Of Water (Bvw)supporting

confidence: 83%

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Log based petrophysical analysis of mio-pliocene sandstone reservoir encountered in well Rashidpur 4 of Bengal Basin in Bangladesh

Farhaduzzaman

Islam

Abdullah

et al. 2016

Bangladesh J. Sci. Ind. Res.

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Rashidpur is located in the northeastern part of Bangladesh which is surrounded on three sides by India and on a small portion by Myanmar. Gamma-ray, spontaneous potential, density, neutron, resistivity, caliper, temperature and sonic logs are used to analyze petrophysical parameters of the well Rashidpur 4, Bangladesh. Quantitative measurements of different factors such as shale volume, porosity, permeability, water saturation, hydrocarbon saturation and bulk volume of water are carried out using well logs. Petrographic and XRD results based on several core samples are also compared with log-derived parameters. Twenty permeable zones are identified whereby four are hydrocarbon bearing in the studied Mio-Pliocene reservoir sandstones. Measured shale volume ranges from 11% to 38% and porosity is 19% to 28%. However, log-derived porosity is slightly higher than the thin section porosity. Water saturation of the interested zones varies from 14% to 38%, 13% to 39% and 16% to 41% measured from Schlumberger, Fertl and Simandoux formula respectively. Conversely, hydrocarbon saturation of the examined hydrocarbon zones ranges from 62% to 86%, 61% to 83% and 59% to 84% respectively. In the analyzed zones, the permeability values are calculated as 28-305 mD. Good to very good quality hydrocarbon reservoirs are appraised for the studied four zones based on the petrophysical parameters, petrographic observation and XRD analysis. Among these, Zone 4 is the best quality reservoir for hydrocarbon.

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Section: Bulk Volume Of Water (Bvw)supporting

confidence: 83%

“…4). It is also reported by others (Imam and Shaw, 1987;Islam 2009 and2010;Rahman and McCann, 2012). Anomaly in log based measurements may be because of the inherent problems of different formulas, e.g., selection of saturation and permeability formulas and constraints related to values of different constants.…”

Section: Bulk Volume Of Water (Bvw)mentioning

confidence: 69%

Log based petrophysical analysis of mio-pliocene sandstone reservoir encountered in well Rashidpur 4 of Bengal Basin in Bangladesh

Farhaduzzaman

Islam

Abdullah

et al. 2016

Bangladesh J. Sci. Ind. Res.

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“…Anomalously high porosity is produced by extensive feldspars dissolution (Figs. 4(b) and 6(d)) at the depth of 3500−3600 m. A certain quantity of SiO 2 is formed in the process of feldspars dissolution and it will be precipitated as quartz overgrowths in suitable condition [17]. Therefore, it is concluded that quartz overgrowth is mainly formed by feldspars dissolution.…”

Section: Quartz Cementmentioning

confidence: 95%

“…Precipitation temperature of carbonate cement can be calculated by oxygen isotope value of carbonate cement [17,27]. Carbonate cements have a relative wide range of δ 18 O values from 13.331‰ to 21.846‰ (SMOW) ( Table 2), which are more positive than the typical values of meteoric water with δ 18 O values from −12‰ to 0‰ (SMOW) [28−29].…”

Section: Isotopic Data Of Carbonate Cementsmentioning

confidence: 99%

Diagenetic evolution and its effect on reservoir-quality of fan delta sandstones during progressive burial: Evidence from the upper part of the fourth member of Shahejie formation, Bonan sag, Jiyang depression

Cao

Wang

et al. 2015

J. Cent. South Univ.

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Petrographic analysis combined with various techniques, such as thin section identification, fluid inclusions, isotopic data, petro-physical property testing and oil testing results, was used to study diagenetic evolution and its effect on reservoir-quality of fan delta reservoirs of Es4s in the Bonan sag. The diagenesis is principally characterized by strong compaction, undercompaction, multi-phase of dissolution and cementation. Compaction played a more important role than cementation in destroying the primary porosity of the sandstones. The reservoirs have experienced complicated diagenetic environment evolution of "weak alkaline− acid−alkalinity−acid−weak alkalinity" and two-stage of hydrocarbon filling. The diagenetic sequences are summarized as "early compaction/early pyrite/gypsum/calcite/dolomite cementation→feldspar dissolution/the first stage of quartz overgrowth → early hydrocarbon filling→quartz dissolution/anhydrite/Fe-carbonate cementation→Fe-carbonate dissolution/feldspar dissolution/ the second stage of quartz overgrowth→later hydrocarbon filling→later pyrite cementation. In the same diagenetic context, the diagenetic evolution processes that occurred in different sub/micro-facies during progressive burial have resulted in heterogeneous reservoir properties and oiliness. The braided channel reservoirs in fan delta plain are poorly sorted with high matrix contents. The physical properties decrease continually due to the principally strong compaction and weak dissolution. The present properties of braided channel reservoirs are extremely poor, which is evidenced by few oil layers developed in relatively shallow strata while dry layers entirely in deep. The reservoirs both in the underwater distributary channels and mouth bars are well sorted and have a strong ability to resist compaction. Abundant pores are developed in medium-deep strata because of modifications by two-stage of acidic dissolution and hydrocarbon filling. The present properties are relatively well both in the underwater distributary channels and mouth bars and plenty of oil layers are developed in different burial depth. The present reservoir properties both in interdistributary channel and pre-fan delta are poor caused by extensively cementation. Small amounts of oil layers, oil-water layers and oil-bearing layers are developed in relatively shallow strata while dry layers totally in deep.

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“…The gas expansion method was used for determining porosity and helium was used as the measuring medium (cf. Rahman and McCann, 2012). Moreover, the presence or absence of oil was collected for 31 plug samples from Geological Scientific Research Institute of Shengli Oilfield Company, Sinopec.…”

Section: Samples and Methodsmentioning

confidence: 99%

Origin of carbonate cements with implications for petroleum reservoir in Eocene sandstones, northern Dongying depression, Bohai Bay basin, China

Cao

Wang

et al. 2016

Energy Exploration & Exploitation

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The Eocene Es4s interval is an important petroleum reservoir of sublacustrine fan dominated at the depths of 2500-4000 m in Dongying depression, Bohai Bay basin. Based on core observation, three types of carbonate-cemented beds have been identified and commonly contain ferroan calcite and ankerite predominantly and less calcite and dolomite. Precipitation temperatures range from 34.6 to 72.8 C for calcite and dolomite cements, and from 110 to 153 C for ferroan calcite and ankerite cements. The high 13 C PDB values (À0.65 to +5.59%) for calcite and dolomite suggest that dissolved inorganic carbon, derived from methanogenic fermentation of organic matter in adjacent mudstones. The low 13 C PDB values (+1.04 to +3.29%) for ferroan calcite and ankerite probably indicate a mixture of carbon derived from decarboxylation of organic acid as well as from the dissolution of early formed carbonate cements. High plug porosity is mainly developed at the central section of sandstones vertically and the porosity decreases sharply toward the top and base of the sandstones due to extensively carbonate-cemented beds. The carbonate-cemented beds varies from 0.02 to 0.5 m in thickness and might extend from tens to hundreds meters laterally. It could be served as fluid-flow barriers and seals for petroleum, and result in reservoir deterioration and significant heterogeneity.

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Diagenetic history of the Surma Group sandstones (Miocene) in the Surma Basin, Bangladesh

Cited by 54 publications

References 29 publications

Log based petrophysical analysis of mio-pliocene sandstone reservoir encountered in well Rashidpur 4 of Bengal Basin in Bangladesh

Log based petrophysical analysis of mio-pliocene sandstone reservoir encountered in well Rashidpur 4 of Bengal Basin in Bangladesh

Diagenetic evolution and its effect on reservoir-quality of fan delta sandstones during progressive burial: Evidence from the upper part of the fourth member of Shahejie formation, Bonan sag, Jiyang depression

Origin of carbonate cements with implications for petroleum reservoir in Eocene sandstones, northern Dongying depression, Bohai Bay basin, China

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