Hydrocarbon accumulation mechanism of low permeable tight lithologic oil fields in the Yanchang Formation, Ordos Basin, China

Guo, Yanru; Liu, Junbang; Yang, Hua; Liu, Zhen; Fu, Jinhua; Yao, Jiayi; Xu, Wei; Zhang, Yanling

doi:10.1016/s1876-3804(12)60061-5

Cited by 63 publications

(33 citation statements)

References 5 publications

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“…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]. Chang 7 is dominated by thickbedded, mudstone-dominated, organic-enriched dark shale in the lower sections [57], with tight sandstone and siltstone, the focus of this research, interbedded with shale in the upper sections.…”

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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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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“…2) (Guo et al, 2012;Zeng and Li, 2009). The Ordos Basin becomes an isolated lake basin during the Middle and Late Triassic, and a series of lacustrine and deltaic clastic sediments was deposited in the basin during this time, known as the Yanchang Formation (Ji et al, 2008).…”

Section: Stratigraphy and Depositional Faciesmentioning

confidence: 99%

“…2). Typical stratigraphic section of the Yanchang Formation, Upper Triassic from the Ordos basin (Modified after Dou et al, 2010;Guo et al, 2012;Zeng and Li, 2009). …”

Section: Petroleum Systemsmentioning

confidence: 99%

“…Chang 7 mudstones and shale form direct seals for Chang 8 sandstones (Guo et al, 2012), deposition of mudstones about 100 m thick in extensive swamp and shallow-lacustrine environments during the deposition of the upper part of the Yanchang Formation, serve as a regional seal of the Triassic oil pools (Yang et al, 2005).…”

Section: Petroleum Systemsmentioning

confidence: 99%

“…Oil-source correlation shows that the occurrence of the reservoir (Chang 8) immediately above the source-rock (Chang 7) provides an ideal setting for downward petroleum migration, the over-pressure associated with hydrocarbon generation in the source rocks are assumed to be the main driving forces for oil migration and accumulation in Chang 8 tight reservoirs (Guo et al, 2012). Developed on the stable North China Craton block, the Ordos basin has experienced little tectonic deformation since the Palaeozoic , indicating a good condition for preservation of petroleum resources.…”

Section: Petroleum Systemsmentioning

confidence: 99%

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Prediction of Diagenetic Facies using Well Logs: Evidences from Upper Triassic Yanchang Formation Chang 8 Sandstones in Jiyuan Region, Ordos Basin, China

Lai

Wang

Chai

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Paleogeotemperature and maturity evolutionary history of the source rocks in the Ordos Basin

Ren

et al. 2017

Geological Journal

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Tectonothermal evolution has an important control on maturity and hydrocarbon‐generation of source rocks. On the basis of analysis of the present‐day geothermal gradient, rock thermophysical parameters and heat flow, the thickness contour and vitrinite reflectance can be identified, and the distribution of thermal anomaly was discussed. The paleogeotemperature and paleogeothermal gradients are calculated after the recovery of the erosional thickness. With the theory of the recovering of the superposed and modified sedimentary basin, the evolutionary history since the end of Triassic, the end of Jurassic, the Late Early Cretaceous is presented for two sets of source rocks recovered in various perspectives of plans, cross‐sections, important wells, and typical areas. The impact of tectonothermal evolution on the maturity and hydrocarbon‐generation history of the source rocks is discussed. The paleogeothermal gradient (4.0 °C/100 m on average) is higher than the present one (2.9 °C/100 m on average). With the slightly continuous increase since the Late Paleozoic, the paleogeotemperature of the Ordos Basin reached its maximum in Late Early Cretaceous and decreased continuously from then on. The paleogeotemperature and maturity of the source rocks continuously increased before Late Early Cretaceous. The tectonothermal event during Late Jurassic to Early Cretaceous controlled the source rocks with the high temperature and maturity in the Wuqi‐Qingyang‐Fuxian. The temperature decreased, and the maturity hardly changed after the Late Cretaceous. The source rocks of the Shanxi Formation reached maturity, high maturity and over‐maturity at the Late Triassic, the Late Jurassic, and the Early Cretaceous, respectively. The source rocks of the Yanchang Formation reached low maturity and maturity sequentially all in the Early Cretaceous.

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Hydrocarbon accumulation mechanism of low permeable tight lithologic oil fields in the Yanchang Formation, Ordos Basin, China

Cited by 63 publications

References 5 publications

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

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

Prediction of Diagenetic Facies using Well Logs: Evidences from Upper Triassic Yanchang Formation Chang 8 Sandstones in Jiyuan Region, Ordos Basin, China

Paleogeotemperature and maturity evolutionary history of the source rocks in the Ordos Basin

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