Oolitic sandbody depositional models and geometries, Mississippian of southwest Britain: implications for petroleum exploration in carbonate ramp settings

Burchette, Trevor P.; Wright, V. Paul; Faulkner, Tom

doi:10.1016/0037-0738(90)90121-9

Cited by 88 publications

(45 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, vertical heterogeneity is important in predicting the propagation of hydraulic fractures [18,19]. The significant vertical heterogeneity present in many hydrocarbon reservoirs has been well documented, including in the Mississippian reservoir in North America [20], the Permian reservoir in west Texas [21], and Yanchang-formation shale in Central China [22]. The vertical heterogeneity of shale gas reservoirs ranges from the microscale to the basin scale and is significantly more complex than the vertical heterogeneity of other conventional or unconventional reservoirs [23].…”

Section: Introductionmentioning

confidence: 99%

Vertical Heterogeneity of the Shale Reservoir in the Lower Silurian Longmaxi Formation: Analogy between the Southeastern and Northeastern Sichuan Basin, SW China

et al. 2017

View full text Add to dashboard Cite

Lower Silurian Longmaxi formation (LSL) shale is widely and continuously distributed in the northeastern Sichuan Basin and, based on structural analogies with the gas producing LSL formation in the southeastern Sichuan Basin, has significant potential for shale gas exploration. However, limited research has been performed to evaluate the shale gas potential in this region. Samples from a recently completed exploratory well (Well-WQ2) in the northeastern Sichuan Basin indicate that the LSL shale has a vertical property sequence that closely resembles the vertical property sequences in wells in the gas-producing sections of the southeastern Sichuan Basin. The continuous sampling and analyses of Well-WQ2 have allowed a detailed investigation of the vertical variations in lithofacies, mineral characteristics, pore structures, and organic geochemical characteristics. The Longmaxi formation was divided into two third-order sequences (SQ1 and SQ2) based on systematic core observations and well logging analyses. Both SQ1 and SQ2 include a transgressive system tract (TST) and a high-stand system tract (HST). The lithofacies exhibit an upward decrease in the organic content. From SQ1 to SQ2, the quartz content, in situ graptolite content, total organic carbon (TOC) content, and brittleness index decrease, but the clay mineral content increases. The LSL shale sections from depths of 1204 to 1214 m and from 1271 to 1282 m possess well-developed fractures and high permeability. Additionally, the average porosity and permeability in SQ1 are higher than those in SQ2. In addition, the positive correlation between the TOC and quartz contents of the assayed samples suggests that much of the quartz is of biogenic origin. Changes in the sedimentary and diagenetic environments during deposition are two key factors that contribute to the observed vertical heterogeneity of the Longmaxi formation. In conclusion, the shale sections of the lower part of the SQ1, like their analogs in the southeastern Sichuan Basin, are the most favorable targets for shale gas production in the northeastern Sichuan Basin.

show abstract

Section: Introductionmentioning

confidence: 99%

Vertical Heterogeneity of the Shale Reservoir in the Lower Silurian Longmaxi Formation: Analogy between the Southeastern and Northeastern Sichuan Basin, SW China

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Despite their abundance in the sedimentary record, knowledge of the factors that controlled the sedimentation in ancient epeiric carbonate ramps is limited. This is mainly because of the absence of recent analogues, and the differences on the climatic condition and the oceanic circulation between the Holocene and the greenhouse periods (Burchette et al, 1990;Burchette and Wright, 1992;Aurell et al, 1995;Wright and Burchette, 1996).…”

Section: Introductionmentioning

confidence: 99%

Proximal–distal facies relationships and sedimentary processes in a storm dominated carbonate ramp (Kimmeridgian, northwest of the Iberian Ranges, Spain)

Bádenas

Aurell

2001

Sedimentary Geology

View full text Add to dashboard Cite

Facies analysis of the upper Kimmeridgian rocks in the outcrops located near Ricla (Zaragoza province, northeast Spain) and the integration of the resultant data in a broader context (the northern part of the Iberian Basin), has produced two general models showing the facies distribution and the processes that controlled the sedimentation in the Kimmeridgian carbonate ramp. Using these two models the transition from shallow to relatively deep environments of the carbonate ramp is examined in detail. Model 1 corresponds to the development of a mixed carbonate-siliciclastic ramp during a slow rise and stillstand of sea level (Sequence 1-HST), whereas Model 2 represents the growth of a pure carbonate ramp during a rapid rise of sea level (Sequence 2-TST).Carbonate production was higher in the shallow ramp domains (coral reefs and oolitic shoals in Model 1 and reefs in Model 2) than in deeper domains, where there is no indication of signi®cant pelagic or benthic production. The activity of unidirectional return¯ows induced by winter storms and hurricanes, played an important role in the redistribution of the sediment across the ramp, generating different coarse-grained deposits. In the inner and mid-ramp settings dunes, lower scale bedforms and tempestites occur in Model 1, and storm lobes, bars and tempestites in Model 2. Moreover, a signi®cant bulk of the carbonate mud produced in shallow areas would eventually be resedimented in the outer ramp as suspended load in the density currents. Stillstand of sea level in Model 1 involved a rapid progradation of the inner and proximal mid-ramp carbonate and siliciclastic facies. The rapid relative sea level rise of Model 2 is determined by the dominance of the carbonate facies and by the presence of aggradational geometries in the transitional area between shallow and deep-ramp domains. The presence of relatively thick sections in the outer-ramp settings (instead of condensed sections, as observed in Model 1) during times of sea level rise (Model 2) can mainly be explained by the increase of the shallow production in the reef dominated areas. q

show abstract

“…This led to short-term optimal living conditions for pioneering organisms like calcareous algae and bryozoans (Helm 2005). Based on modern analogues (Hine 1977;Burchette et al 1990;Rossetti 1997;André et al 2003;Anastas et al 1997;Azerêdo 1998;Gonzalez and Eberli 1997) massive and medium-to large-scale planar cross-stratified oolitic limestones are interpreted as sand shoals, bars or banks in a c Large-scale planar cross-stratified oolitic grainstones, interpreted to represent longshore bars or shoals (Korallenoolith Formation). d 2 m thick and a few tens of m wide channel, filled with well-sorted, grey coloured sandstones (Süntel Formation) storm-and/or tide-influenced shallow-water setting.…”

Section: Discussionmentioning

confidence: 99%

Facies architecture of a Late Jurassic carbonate ramp: the Korallenoolith of the Lower Saxony Basin

Kastner

Schülke

Winsemann

2007

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

The sedimentary succession of a Late Jurassic (Oxfordian to basal Kimmeridgian) carbonate ramp is described and interpreted. The study area is located in the central part of the Lower Saxony Basin in NW Germany, which forms part of the Central European Basin. Eight well-exposed and undeformed sections of the study area (Süntel area, Wesergebirge and eastern part of the Wiehengebirge) provide detailed information about lithofacies and lateral thickness variations. Biostratigraphically, the age of these sediments is poorly constrained. Twenty microfacies types are recognized that can be grouped into seven facies associations: (a) strongly bioturbated marlstones deposited near storm wave base (SWB), (b) foraminifera-rich wackestones, (c) wackestones and floatstones with biostromes and (d) bioclastic limestones deposited between SWB and fair-weather wave base (FWWB), (e) oolitic and iron-oolitic limestones and (f) siliciclastic sediments deposited above FWWB, and (g) lagoonal deposits. These facies associations characterize a storm dominated shallow mixed carbonate-siliciclastic ramp. Based on facies changes, quartz content, and gamma ray logs, the Korallenoolith Formation can be subdivided into a lower carbonate-dominated and an upper siliciclastic-dominated part, build up by different scales of small-to large-scale deepening-and shallowing-upward cycles. A preliminary correlation of measured outcrops of this formation is presented.

show abstract

Oolitic sandbody depositional models and geometries, Mississippian of southwest Britain: implications for petroleum exploration in carbonate ramp settings

Cited by 88 publications

References 28 publications

Vertical Heterogeneity of the Shale Reservoir in the Lower Silurian Longmaxi Formation: Analogy between the Southeastern and Northeastern Sichuan Basin, SW China

Vertical Heterogeneity of the Shale Reservoir in the Lower Silurian Longmaxi Formation: Analogy between the Southeastern and Northeastern Sichuan Basin, SW China

Proximal–distal facies relationships and sedimentary processes in a storm dominated carbonate ramp (Kimmeridgian, northwest of the Iberian Ranges, Spain)

Facies architecture of a Late Jurassic carbonate ramp: the Korallenoolith of the Lower Saxony Basin

Contact Info

Product

Resources

About