Upper Permian Junggar and Upper Triassic Ordos lacustrine source rocks in Northwest and Central China: Organic geochemistry, petroleum potential and predicted organofacies

Pan, Songqi; Horsfield, Brian; Zou, Caineng; Zhi, Yang

doi:10.1016/j.coal.2016.03.005

Cited by 30 publications

(28 citation statements)

References 63 publications

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“…Most of the studied samples plot within the region of mixed organic matter deposited under reducing conditions. The organic matter is of Type II or a mixed Type II and III, which is consistent with our previous work upon the characterization of geochemistry and organofacies for Ordos lacustrine source rocks showing an aquatic origin of organic precursors (Pan et al, 2016). Only one sample (R101409) from the source rock extracts shows a composition more typical of a more oxidizing depositional environment with significantly high intensity of pristane (Fig.…”

Section: Molecular Compositionsupporting

confidence: 77%

“…Leeuw, 1995;Chen and Summons, 2001), especially resulting from hypersalinity (Peters et al, 2007). The low concentration of gammacerane is also supported by the reconstructed water chemistry composition of Ordos Lake which was predominantly freshwater without salinity stratification at the time of deposition (Pan et al, 2016).…”

Section: Sample Grouping In Q-mode Factor Analysismentioning

confidence: 76%

“…A detailed analysis of the geological framework and petroleum play of the area under study has recently been published (Pan et al, 2016), building upon earlier works (Sun et al, 1989;Zhao et al, 1996;Liu and Yang, 2000;Yang et al, 2005;Ren et al, 2007;Yang and Deng, 2013;Zou et al, 2013). Tectonic events and thermal history are responsible for the formation of many resources (e.g., petroleum, coal and uranium mine) in the Ordos Basin (Jiao et al, 2005;Chen et al, 2007;Hanson et al, 2007;Ren et al, 2007;Yang et al, 2016).…”

Section: Geological Framework and Thermal Historymentioning

confidence: 99%

“…Our previous work has documented detailed geochemical properties and predicted organofacies for this shale system (Pan et al, 2016). The Chang 7 Shale consists primarily of laminated shale and occasional tuffaceous mudstone and muddy siltstone interbeds.…”

Section: Geological Framework and Thermal Historymentioning

confidence: 99%

“…As an expansion of the work presented by Pan et al (2016), the current study was established to apply depositional environment typing based on geochemical characterization. Here we present a geochemical characterization using a set of samples from the Upper Triassic Yanchang Formation as a case study, in order to take advantage of traditional geochemical methods and the statistical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Statistical analysis as a tool for assisting geochemical interpretation of the Upper Triassic Yanchang Formation, Ordos Basin, Central China

Pan

Horsfield

Zou

et al. 2017

International Journal of Coal Geology

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The Yanchang Formation in the Ordos Basin is the most important petroleum play not only for conventional oil and gas accumulations, but also for newly emerging shale oil and tight gas resources. The molecular characterization of the basinwide source rocks predicts three groups of generative petroleum types: Paraffinic High Wax Oil, mixed base (Paraffinic-Naphthenic-Aromatic) Low Wax Oil, and Gas and Condensate. Supplementary to previous work, 68 samples including the crude oils, source bitumens and reservoir extracts from the Yanchang petroleum play are analyzed. The distribution of two terpane classes (eight tricyclic terpanes and eight pentacyclic terpanes) are determined with subsequent simultaneous RQ-mode factor analysis for a composite data set of these samples alongside 216 published crude oils worldwide with known facies descriptions. Thermal maturity has been evaluated as a consistent distribution at first using a combined method of a maturity-related biomarker [Ts / (Ts + Tm)] and aromatic parameters (Methyldibenzothiophene Ratios) to alleviate the maturity differences effect when discussing geochemical characterization. The R-mode factor analysis consists of the first two factors that are describing 45 present of the cumulative total variance in the data set, and presents a sample grouping pattern in Q-mode factor analysis which is determined by different contributions of terpane associations, i.e., the tricyclic C 21 coupled with pentacyclic C 26 , C 27 , C 28 and C 30 , in the same factor space. Three terpane associations, the C 26 and C 28 terpanes, the C 21 and C 30 terpanes and the C 27 pentacyclic terpenes, are respectively responsible for discriminating crude oil, reservoir extracts and source bitumens in RQ-mode factor analysis. Molecular compositions further address more detailed interrelationships among three sample groups that crude oils and reservoir extracts are sharing close genetic relationships both in depositional environment typing and C 27 -C 28 -C 29 sterane distribution. Samples from source rocks vary much significantly. A mixing process which occurs after oils has been expelled from host source rocks into carrier units during accumulation. In addition, the migration-contamination of C 29 sterols when oils are cross through the Chang 7-2 unit along migration pathways might also explain this lack of correlation between source rocks and oil-reservoir system.

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Section: Molecular Compositionsupporting

confidence: 77%

Section: Sample Grouping In Q-mode Factor Analysismentioning

confidence: 76%

Section: Geological Framework and Thermal Historymentioning

confidence: 99%

Section: Geological Framework and Thermal Historymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Statistical analysis as a tool for assisting geochemical interpretation of the Upper Triassic Yanchang Formation, Ordos Basin, Central China

Pan

Horsfield

Zou

et al. 2017

International Journal of Coal Geology

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Source-Rock Evaluation Using the Rock-Eval Technique

Hazra

Wood

Mani

et al. 2019

Evaluation of Shale Source Rocks and Reservoirs

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An overview of 20 years’ hydrocarbon exploration studies and findings in the Late Cretaceous-to-Tertiary onshore Central Sarawak, NW Borneo: 1997–2017 in retrospect

Adepehin

Ali

Zakaria

et al. 2018

J Petrol Explor Prod Technol

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An overview and integration of key petroleum exploration findings in the onshore Central Sarawak Basin, NW Borneo in the last 2 decades is presented. Findings revealed that critical moments for the generation and preservation of hydrocarbon may be found in the Early Oligocene, Early Miocene, and Late Miocene times. Geochemical data of ninety-five (95) source rocks suggest TOC values of 1.54 wt% (Miri Formation) to 70.00 wt% (Nyalau Formation) with promising S 2 and S 2 /S 3 ratios. T Max fell below the 435 °C maturation threshold. Reservoir facies of the Nyalau, Belait, and Lambir formations and their subsurface equivalents have moderate-to-poor poro-perm properties. Reservoir plays in the area are the Oligocene-Miocene clastics and limestones of Cycles I, II, III, and IV. Significant diagenetic modification is evident in analogue reservoir sandstones, and could constitute major poro-perm control in subsurface reservoir units. Observed predominance of structural related traps gleaned from seismic data is a reflection of the paleotectonic (Sarawak orogenic) event (ca. 40 − 36 Ma) associated with the region. Shale rocks overlying possible reservoirs and observed juxtaposition of reservoir units against impermeable beds provide seal integrity. Deeply seated faults are potential conduits, in addition to buoyancy. Concentration of future research efforts on petroleum/basin modeling and subsurface reservoir assessment was to further improve current understanding of the under-explored onshore Central Sarawak.

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Upper Permian Junggar and Upper Triassic Ordos lacustrine source rocks in Northwest and Central China: Organic geochemistry, petroleum potential and predicted organofacies

Cited by 30 publications

References 63 publications

Statistical analysis as a tool for assisting geochemical interpretation of the Upper Triassic Yanchang Formation, Ordos Basin, Central China

Statistical analysis as a tool for assisting geochemical interpretation of the Upper Triassic Yanchang Formation, Ordos Basin, Central China

Source-Rock Evaluation Using the Rock-Eval Technique

An overview of 20 years’ hydrocarbon exploration studies and findings in the Late Cretaceous-to-Tertiary onshore Central Sarawak, NW Borneo: 1997–2017 in retrospect

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