Hydrocarbon origin and reservoir forming model of the Lower Yanchang Formation, Ordos Basin

Li, Xiangbo; Liu, Xianyang; Zhou, Shengyang; Liu, Huaqing; Chen, Qilin; Jing, Wang; Liao, Jianbo; Huang, Junping

doi:10.1016/s1876-3804(12)60031-7

Cited by 46 publications

(10 citation statements)

References 3 publications

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“…By the Chang 7 sedimentary period, the evolution of the lake basin reached its heyday, with the largest lake area and the deepest water depth reaching 60 m. The lake basin gradually shrank during the 6th to 2nd stage. Then, the lake basin depression of Chang 1 oil layer group disappeared (Li et al 2012;Liao et al 2012).…”

Section: Geological Backgroundmentioning

confidence: 99%

Classification and evaluation of tight sandstone reservoirs based on diagenetic facies: a case study on Chang 6 reservoir in the center-west Ordos Basin

Gao

Shi²,

Xie³

et al. 2021

J Petrol Explor Prod Technol

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Tight sandstone reservoirs dominated by are developed in the Chang 6 oil layer group of the Yanchang Formation in the central-western part of the Ordos Basin. Featuring the lacustrine delta facies, Chang 6 formation in the center-west area of Ordos Basin shows an increasing petroleum reserve expectation. Its exploitation practice, however, has many problems caused by tight sandstone reservoir features. According to diagenetic and pore analysis, the diagenetic facies in the study area are grouped into four types: chlorite-film-intergranular-pore, feldspar-dissolution, clay-cemented-micropore, carbonate-cemented-tightness for their obvious differences in mineral feature and pore evolution. By introducing the comprehensive classification parameter synthesized from 9 other parameters, the reservoir quality is divided up into four levels: I(Feci > 1), II(3 ≤ Feci ≤ 7), III(-2 ≤ Feci ≤ 3), IV(Feci ≤ -2). The reservoir quality division matches well with the diagenetic facies group. To decide the diagenetic type and reservoir quality division in all wells, the logging data are utilized with the Fisher discriminant method, which has obtained a good performance. The method enables the reservoir quality analysis expanding to all wells from samples, which is helpful for exploitation of the study area.

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Section: Geological Backgroundmentioning

confidence: 99%

Classification and evaluation of tight sandstone reservoirs based on diagenetic facies: a case study on Chang 6 reservoir in the center-west Ordos Basin

Gao

Shi²,

Xie³

et al. 2021

J Petrol Explor Prod Technol

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“…From Chang 7 to Chang 1, the youngest unit, sedimentation occurred in progressively shallower lake waters. Maximum flooding therefore occurred in the Chang 7 period; this resulted in widely distributed, organic-rich, source rocks in the Ordos Basin [54]. The Chang 7 Member is thus the dominant source rock that has charged a number of Yanchang Formation reservoirs [55,56].…”

Section: Geological Settingmentioning

confidence: 99%

The Controls of Pore-Throat Structure on Fluid Performance in Tight Clastic Rock Reservoir: A Case from the Upper Triassic of Chang 7 Member, Ordos Basin, China

et al. 2018

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The characteristics of porosity and permeability in tight clastic rock reservoir have significant difference from those in conventional reservoir. The increased exploitation of tight gas and oil requests further understanding of fluid performance in the nanoscale pore-throat network of the tight reservoir. Typical tight sandstone and siltstone samples from Ordos Basin were investigated, and rate-controlled mercury injection capillary pressure (RMICP) and nuclear magnetic resonance (NMR) were employed in this paper, combined with helium porosity and air permeability data, to analyze the impact of pore-throat structure on the storage and seepage capacity of these tight oil reservoirs, revealing the control factors of economic petroleum production. The researches indicate that, in the tight clastic rock reservoir, largest throat is the key control on the permeability and potentially dominates the movable water saturation in the reservoir. The storage capacity of the reservoir consists of effective throat and pore space. Although it has a relatively steady and significant proportion that resulted from the throats, its variation is still dominated by the effective pores. A combination parameter ( ) that was established to be as an integrated characteristic of pore-throat structure shows effectively prediction of physical capability for hydrocarbon resource of the tight clastic rock reservoir.

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“…Shales, the main reservoir for oil and gas resources, have been the major subject of the unconventional oil/gas study (Xie et al, 2016). Organic-rich and low-thermal mature lacustrine shales that are widely distributed in China have been regarded as the main target rocks for shale oil resources, especially for the light shale oils with high recovery efficiency (Yang et al, 2005;Hanson et al, 2007;Hu et al, 2008;Liu et al, 2010;Li et al, 2012;Lamei et al, 2013;Tang et al, 2014;Peng and Jia, 2021). Some breakthroughs have been made in continental shales in China, especially marked by the success of well Liuping 177 drilled in Zhangjiatan shale of the Triassic Yanchang Formation in Ordos Basin (Guo et al, 2014;Ji et al, 2014;Yu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Application of the Grain-Based Rock-Eval Pyrolysis Method to Evaluate Hydrocarbon Generation, Expulsion, and Retention of Lacustrine Shale

Liao

Wang²,

Chen³

et al. 2022

Front. Earth Sci.

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The study on hydrocarbon generation, expulsion, and retention of shale is becoming more and more important as the exploration of unconventional oil and gas worldwide. There are multiple sets of lacustrine shales in the eastern area of China, which show a great potential for shale oil/gas exploration. In this study, a grain-based Rock-Eval pyrolysis method was conducted on three sets of lacustrine shales, including the Nenjiang shale, Shahejie shale, and Maoming oil shale, to evaluate the hydrocarbon generation, expulsion, and retention. For comparison, pyrolysis of kerogen from the three shale samples was also carried out under the same experimental conditions. The Maoming oil shale showed a slightly broader distribution of activation energies than the Nenjiang and Shahejie shales, while the Nenjiang shale showed higher dominant activation energy than the Shahejie shale and the Maoming oil shale. At laboratory heating rates (5–25°C/min), the corresponding temperature to the maximum hydrocarbon generating rate of shale grains was collectively higher than that of their kerogen, especially for the Nenjiang and Shahejie shales, which implies a lagging effect during the hydrocarbon generation and expulsion process for the shales. By calculating the differences in hydrocarbon yields between shale grain and kerogen samples, the content and proportion of the retained hydrocarbons were measured at different maturation stages. The results showed that the Nenjiang shale from the Songliao Basin has the strongest retention ability but the weakest expulsion ability, whereas the Shahejie shale from the Dongying Depression has the strongest expulsion ability but the weakest retention ability among the three samples. Moreover, it is found that the pore structure of lacustrine shales is likely the principal factor controlling the hydrocarbon retention ability/capacity. This study is expected to provide a geochemical quantitative basis for evaluating hydrocarbon generation, expulsion, and retention of shale.

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Hydrocarbon origin and reservoir forming model of the Lower Yanchang Formation, Ordos Basin

Cited by 46 publications

References 3 publications

Classification and evaluation of tight sandstone reservoirs based on diagenetic facies: a case study on Chang 6 reservoir in the center-west Ordos Basin

Classification and evaluation of tight sandstone reservoirs based on diagenetic facies: a case study on Chang 6 reservoir in the center-west Ordos Basin

The Controls of Pore-Throat Structure on Fluid Performance in Tight Clastic Rock Reservoir: A Case from the Upper Triassic of Chang 7 Member, Ordos Basin, China

Application of the Grain-Based Rock-Eval Pyrolysis Method to Evaluate Hydrocarbon Generation, Expulsion, and Retention of Lacustrine Shale

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