Climatic and tectonic controls of lacustrine hyperpycnite origination in the Late Triassic Ordos Basin, central China: Implications for unconventional petroleum development

Yang, Renchao; Jin, Zhijun; Loon, A.J. van; Han, Zuozhen; Fan, Aiping

doi:10.1306/06101615095

Cited by 148 publications

(117 citation statements)

References 43 publications

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“…Among them, the Chang 7 Member consists of shales, black mudstones together with thin beds of fine‐grained sandstone and siltstone, which serves as the most important layer for shale gas production. The Chang 7 shale is characterized by wide distribution and great thickness (Figure B), and represents the maximum transgressive stage across the whole basin …”

Section: Geological Settingmentioning

confidence: 99%

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Nanoscale pore structure and fractal characteristics of the continental Yanchang Formation Chang 7 shale in the southwestern Ordos Basin, central China

You

Chen

et al. 2019

Energy Science & Engineering

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Shales from the Yanchang Formation Chang 7 Member in the Ordos Basin are among the most important shale reservoirs in China and have been investigated due to their great potential. Knowledge of pore structure is important for understanding the storage capacity and flow mechanism in shale reservoirs. In this study, eight shale samples were collected from the Yanchang Formation Chang 7 Member in the southwestern Ordos Basin, and their geochemistry, mineral compositions, pore structure, and fractal characteristics were investigated based on X‐ray diffraction (XRD) analysis, total organic carbon (TOC) analysis, low‐pressure adsorption/desorption analysis, thermal maturity analysis, and fractal analysis. The results indicated that the TOC content ranged between 0.48% and 2.37%, and the Ro values varied from 0.826% to 1.217%. The major mineral compositions were quartz and clay minerals. Nitrogen adsorption/desorption analysis indicated that the isotherms were similar for all collected shale samples from the Chang 7 Member and resembled the type IV isotherm. Narrow slit‐like pore was the dominant pore type, and the pore size distribution appeared to be unimodal with its peak mainly around 40 nm. Investigation of factors for pore structures showed that the TOC content was the controlling factor for the Chang 7 shales. The Frenkel‐Halsey‐Hill (FHH) method was applied to determine fractal dimensions, which were calculated as the D1 (relative pressure >0.96), D2 (0.96 >relative pressure >0.45), and D3 (0.45 >relative pressure) values, ranging in the intervals of 2.788~2.854, 2.547~2.688, and 2.410~2.567, respectively. The relatively high fractal dimensions indicated that pore structures were complicated, and the higher D1 values suggested that pores with larger sizes showed a rougher pore surface and more complex pore structure. Fractal dimensions showed positive correlations with the contents of TOC and clay minerals, and a negative relationship with the quartz contents.

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Section: Geological Settingmentioning

confidence: 99%

“…The Chang 7 shale is characterized by wide distribution and great thickness ( Figure 2B), and represents the maximum transgressive stage across the whole basin. 25,27,29,30…”

Section: Geological Settingmentioning

confidence: 99%

Nanoscale pore structure and fractal characteristics of the continental Yanchang Formation Chang 7 shale in the southwestern Ordos Basin, central China

You

Chen

et al. 2019

Energy Science & Engineering

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“…The Ordos Basin, as the second largest sedimentary basin in China, is located in the western part of the North China Block and covers approximately 320,000 km 2 (Figure 1a; Liu et al, 2004;Yang, Jin, Van Loon, Han, & Fan, 2017). It is a typical cratonic basin characterized by gentle, west-dipping monocline with dip angles less than 1° ( Figure 1b; He, 2003;Liu et al, 2014;Wang et al, 2017).…”

Section: Geological Backgroundmentioning

confidence: 99%

Tight oil sandstones in Upper Triassic Yanchang Formation, Ordos Basin, N. China: Reservoir quality destruction in a closed diagenetic system

et al. 2018

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An investigation of the Triassic Yanchang Formation, Ordos Basin, N. China, revealed that the diagenesis and quality of tight oil sandstone reservoirs (with an average porosity of 9.83% and an average permeability of 0.96 mD) were controlled by a closed diagenetic system. The carbonate cements observed in the sandstone were derived from decarboxylation of organic matter that occurred in the adjacent mudstones. These reactions supplied CO32−, which reacted with cations derived from grain dissolution in the sandstones. The average size of the diagenetic geochemical system with respect to carbonate cements was small (<6 × 10−2 m3), comprising sandstone and its adjacent mudstone(s). The carbonate cements tend to concentrate in the marginal sandstone, which is taken to indicate that the flux of CO32− into the sandstones limited the quantity of carbonate precipitated. In addition, the mass is near balance between the amount of feldspar dissolution and its by‐products in the central sandstone (distance to the sandstone/mudstone interface is mainly more than 1 m), where the permeability of sandstone will present a decreasing trend with the increase of feldspar dissolution pores. The pore space of central sandstone will be just redistributed, with primary intergranular pores converting to feldspar dissolution pores and clay mineral micropores. Thus, the best part of the sandstone reservoirs tends to be the central part of sandstone. In particular, sandstones that are more than 2 m thick could be the potential hydrocarbon reservoirs because they retain the best porosity (average of 13.6%) and permeability (average of 1.8 mD). The results of our study provide an important guide for the exploration of tight oil sandstones in other petroliferous basins over the world.

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“…KEYWORDS hyperpycnal flow, Luanping Basin, sedimentary process, shallow lacustrine setting, Xiguayuan Formation 1 | INTRODUCTION Hyperpycnal flow is a type of relatively dense underflow generated during river flooding (Migeon, Mulder, Savoye, & Sage, 2012;Wright et al, 1986;Yu, 2002). Hyperpycnal flows have been seen as an important sediment-transportation agent in marine and lacustrine basins (Mulder, Syvitski, Migeon, Faugères, & Savoye, 2003;Mutti, Tinterri, Magalhaes, & Basta, 2007;Talling, 2014;Yang, Jin, Van Loon, Han, & Fan, 2017;Zavala et al, 2006). Differing from classic turbidity currents, hyperpycnal flows are generated by sustained river flooding.…”

mentioning

confidence: 99%

“…Relatively dense fluvial discharges entering an oceanic or lacustrine basin commonly result in a subaqueous extension of the fluvial channels in deep-water locations (Xian et al, 2018;Zavala et al, 2006). Such flows are common in modern sedimentary records (Corella et al, 2016;Soyinka & Slatt, 2008;Yang et al, 2017;X. Zhang & Scholz, 2015).…”

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confidence: 99%

Sedimentary characteristics of hyperpycnites in a shallow lacustrine environment: A case study from the Lower Cretaceous Xiguayuan Formation, Luanping Basin, Northeast China

et al. 2019

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Hyperpycnites are extrabasinal turbidites related to hyperpycnal flows which form during river floods. Compared to intrabasinal turbidite systems in deep marine or lacustrine settings, hyperpycnites in shallow lakes settings are not understood. In this work, we studied the typical sedimentary characteristics of shallow lacustrine hyperpycnal flow deposits in outcrops of the Luanping Basin, Northeast China. Based on the sedimentary architecture and analysis of the facies associations in these outcrops, the hyperpycnites can be classified into the following three types: (a) bedload-dominated erosional channel deposits, (b) bedload-and suspended-loaddominated channel-to-lobe transitional deposits, and (c) suspended-load-dominated lobe deposits. The erosional channels in proximal locations are filled by mud clasts, parallel-laminated sandstones, massive sandstones, cross-bedded sandstones, massive siltstones, and mudstones. The channel-to-lobe transitional deposits in a middle location are composed of parallel-laminated sandstones, cross-bedded sandstones, mud clasts near internal erosional surfaces, ripple cross-bedded sandstones, massive siltstones, and mudstones. The lobe deposits in distal locations are composed of ripple cross-bedded sandstones, massive siltstones, and mudstones. The sedimentary process of the shallow lacustrine hyperpycnal flows shows obvious response to periodic flood energy fluctuations. Gentle slope, small capacity of flood discharges and semiarid paleoclimate may be the possible reason for the observed sedimentary architecture of the shallow lacustrine hyperpycnal flow deposits. Therefore, this study

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Climatic and tectonic controls of lacustrine hyperpycnite origination in the Late Triassic Ordos Basin, central China: Implications for unconventional petroleum development

Cited by 148 publications

References 43 publications

Nanoscale pore structure and fractal characteristics of the continental Yanchang Formation Chang 7 shale in the southwestern Ordos Basin, central China

Nanoscale pore structure and fractal characteristics of the continental Yanchang Formation Chang 7 shale in the southwestern Ordos Basin, central China

Tight oil sandstones in Upper Triassic Yanchang Formation, Ordos Basin, N. China: Reservoir quality destruction in a closed diagenetic system

Sedimentary characteristics of hyperpycnites in a shallow lacustrine environment: A case study from the Lower Cretaceous Xiguayuan Formation, Luanping Basin, Northeast China

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