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Shizigou Formation

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Representative seismic profile B–B′ across the northern Qaidam basin. (A) Uninterpreted. (B) Interpreted. The location of this seismic profile is shown in Figure 3. Q—Quaternary; SZ—Shizigou Formation; SY—Shangyoushashan Formation; XY—Xiayoushashan Formation; SG—Shangganchaigou Formation; XG—Xiaganchaigou Formation; LL—Lulehe Formation; K—Cretaceous; J—Jurassic.

Representative seismic profile B–B′ across the northern Qaidam basin. (A) U... Available to Purchase

Published: 26 November 2024
Figure 6. Representative seismic profile B–B′ across the northern Qaidam basin. (A) Uninterpreted. (B) Interpreted. The location of this seismic profile is shown in Figure 3 . Q—Quaternary; SZ—Shizigou Formation; SY—Shangyoushashan Formation; XY—Xiayoushashan Formation; SG—Shangganchaigou
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Stratigraphy of the Dahonggou Section of the Qaidam Basin, northeast Tibetan Plateau, correlated to the recent magnetostratigraphic ages of Wang et al. (2017). GPTS—geomagnetic polarity time scale (Hilgen et al., 2012); VGP—virtual geomagnetic polarity; SZG—Shizigou Formation; SYSS—Shangyoushashan Formation; XYSS—Xiayoushashan Formation; SGCG—Shangganchaigou Formation; XGCG—Xiaganchaigou Formation.

Stratigraphy of the Dahonggou Section of the Qaidam Basin, northeast Tibeta... Available to Purchase

Published: 13 December 2024
Figure 2. Stratigraphy of the Dahonggou Section of the Qaidam Basin, northeast Tibetan Plateau, correlated to the recent magnetostratigraphic ages of Wang et al. (2017) . GPTS—geomagnetic polarity time scale ( Hilgen et al., 2012 ); VGP—virtual geomagnetic polarity; SZG—Shizigou Formation; SYSS
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Comparison diagram of the thickness-distance (T-D) plots and corresponding hinge points of each period (see Fig. 6A for locations). The vertical and horizontal axes indicate the normalized thickness (TN) and distances away from the basin margin (ATF), respectively. TN is obtained following the equation TN = (T–TMin)/(TMax–TMin), where T, TMax, and TMin represent the true, the maximum, and the minimum strata thicknesses in a certain period, respectively. Eroded portions are marked as dotted lines. The shaded blue and gray areas are used to highlight the tendencies of the T-D curves during the stages of the Upper Xiaganchaigou–Xiayoushashan formations and the Shangyoushashan–Shizigou formations, respectively. 1—Lulehe Formation (LLH); 2—Lower Xiaganchaigou Formation (LXG); 3—Upper Xiaganchaigou Formation (UXG); 4—Shangganchaigou Formation (SG); 5—Xiayoushashan Formation (XY); 6—Shangyoushashan Formation (SY); 7—Shizigou Formation (SZG). It is evident that the hinge points are located relatively farther away (by >10 km) from the Altyn Tagh fault on the major anticline belts after ca. 15 Ma compared to the previous stage (panels A, B, and D).

Comparison diagram of the thickness-distance ( T - D ) plots and correspond... Open Access

Published: 01 June 2016
the tendencies of the T-D curves during the stages of the Upper Xiaganchaigou–Xiayoushashan formations and the Shangyoushashan–Shizigou formations, respectively. 1—Lulehe Formation (LLH); 2—Lower Xiaganchaigou Formation (LXG); 3—Upper Xiaganchaigou Formation (UXG); 4—Shangganchaigou Formation (SG); 5
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Structural cross section based on surface geology and seismic data. The line location is shown in Figure 1B. , Paleocene Lulehe Formation; , Eocene Xiaganchaigou Formation; , Oligocene Shangganchaigou Formation; , Miocene Xiayoushashan Formation; , Miocene Shangyoushashan Formation; , Pliocene Shizigou Formation and Pleistocene Qigequan Formation.

Structural cross section based on surface geology and seismic data. The lin... Available to Purchase

Published: 01 November 2012
Formation; , Pliocene Shizigou Formation and Pleistocene Qigequan Formation.
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Analysis of the burial history and hydrocarbon accumulation factors in the Yibei subbasin. E3 = lower Ganchaigou Formation; Jur. = Jurassic; M. = Middle; N1 = upper Ganchaigou Formation; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23-Q = Shizigou Formation and Quaternary; Ro = vitrinite reflectance.

Analysis of the burial history and hydrocarbon accumulation factors in the ... Available to Purchase

Published: 12 May 2021
= Shizigou Formation and Quaternary; R o = vitrinite reflectance.
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Interpreted seismic profile (1) in time domain. T0 to T6 are regionally correlative reflectors; T0 at the top of the Shizigou Formation, T1 at the top of the Shangyoushashan Formation, T2 at the top of the Xiayoushashan Formation, T3 at the top of the Shangganchaigou Formation, TR at the top of the Lulehe Formation, and T6 at the top of the Jurassic-Cretaceous strata. GS-1 and GS-2 are two growth-strata sequences associated with the development of the triangle zone and later synclinal folding. TWTT—two-way travel time.

Interpreted seismic profile (1) in time domain. T0 to T6 are regionally cor... Available to Purchase

Published: 01 July 2008
Figure 12. Interpreted seismic profile (1) in time domain. T0 to T6 are regionally correlative reflectors; T0 at the top of the Shizigou Formation, T1 at the top of the Shangyoushashan Formation, T2 at the top of the Xiayoushashan Formation, T3 at the top of the Shangganchaigou Formation, TR
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The quantity of gas generated by the Lower Jurassic (J) and Middle Jurassic source rocks during different geological periods. E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; J = Jurassic; K = Cretaceous; N1 = upper Ganchaigou Formation; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation; Q = Quaternary.

The quantity of gas generated by the Lower Jurassic (J) and Middle Jurassic... Available to Purchase

Published: 12 May 2021
= Cretaceous; N 1 = upper Ganchaigou Formation; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation; Q = Quaternary.
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The calculated vitrinite reflectance (EASY%Ro) history for the top surface of the source rocks in each hydrocarbon generation subbasin of the northern margin of the Qaidam Basin. E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; N1 = upper Ganchaigou Formation; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation; Q1+2 = Quaternary Qigequan Formation.

The calculated vitrinite reflectance (EASY% R o ) history for the top su... Available to Purchase

Published: 12 May 2021
member of the lower Ganchaigou Formation; N 1 = upper Ganchaigou Formation; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation; Q 1+2 = Quaternary Qigequan Formation.
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(continued). (A) Isopach map of the Lulehe Formation (E1+2). (B) Isopach map of the lower Xiaganchaigou Formation (E3-1). (C) Isopach map of the upper Xiaganchaigou Formation (E3-2). (D) Isopach map of the Shanggan-chaigou Formation (N1). (E) Isopach map of the Xiayoushashan Formation (N2-1). (F) Isopach map of the Shangyoushashan Formation (N2-2). (G) Isopach map of the Shizigou Formation (N2-3). (H) Isopach map of Quaternary sediments (Q). See Table 1 for age assignment of each unit.

( continued ). (A) Isopach map of the Lulehe Formation (E1+2). (B) Isopach ... Available to Purchase

Published: 01 July 2008
Formation (N2-1). (F) Isopach map of the Shangyoushashan Formation (N2-2). (G) Isopach map of the Shizigou Formation (N2-3). (H) Isopach map of Quaternary sediments (Q). See Table 1 for age assignment of each unit.
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Proportions of the environmentally sensitive components of the Cenozoic strata of the Dahonggou Section of the Qaidam Basin on the northeast Tibetan Plateau. (A) Mean size (in Φ values) in 10-point running average. (B) Fine grain (of eolian origin) proportion in 10-point running average. (C) Coarse grain (of hydatogenic origin) proportion in 10-point running average. (D) Global deep-sea oxygen isotope (δ18O‰) records (500-point smoothing) (Westerhold et al., 2020). Red shadow—ca. 9 Ma; gray shadow—mid-Miocene Climatic Optimum (MMCO). SZG—Shizigou Formation; SYSS—Shangyoushashan Formation; XYSS—Xiayoushashan Formation; SGCG—Shangganchaigou Formation; XGCG—Xiaganchaigou Formation.

Proportions of the environmentally sensitive components of the Cenozoic str... Available to Purchase

Published: 13 December 2024
. (C) Coarse grain (of hydatogenic origin) proportion in 10-point running average. (D) Global deep-sea oxygen isotope (δ 18 O‰) records (500-point smoothing) ( Westerhold et al., 2020 ). Red shadow—ca. 9 Ma; gray shadow—mid-Miocene Climatic Optimum (MMCO). SZG—Shizigou Formation; SYSS—Shangyoushashan
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One-dimensional burial histories for the H2 and LK1 wells in the northern margin of the Qaidam Basin. (A) H2 well and (B) LK1 well. E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; J1 = Lower Jurassic; J2 = Middle Jurassic; J3 = Upper Jurassic; Jur. = Jurassic; K = Cretaceous; M. = Middle; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation.

One-dimensional burial histories for the H2 and LK1 wells in the northern m... Available to Purchase

Published: 12 May 2021
= Lower Jurassic; J 2 = Middle Jurassic; J 3 = Upper Jurassic; Jur. = Jurassic; K = Cretaceous; M. = Middle; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation.
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One-dimensional burial histories for the H2 and LK1 wells in the northern margin of the Qaidam Basin. (A) H2 well and (B) LK1 well. E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; J1 = Lower Jurassic; J2 = Middle Jurassic; J3 = Upper Jurassic; Jur. = Jurassic; K = Cretaceous; M. = Middle; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation.

One-dimensional burial histories for the H2 and LK1 wells in the northern m... Available to Purchase

Published: 12 May 2021
= Lower Jurassic; J 2 = Middle Jurassic; J 3 = Upper Jurassic; Jur. = Jurassic; K = Cretaceous; M. = Middle; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation.
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Examples of pore-pressure depth profiles in overpressured wells in the northern Qaidam Basin. E1+2 = Paleogene Lulehe Formation; E31 = Lower member of the Paleogene Lower Ganchaigou Formation; E32 = upper member of the Paleogene Lower Ganchaigou Formation; J1 = Lower Jurassic; N1 = Neogene Upper Ganchaigou Formation; N21 = Neogene lower Youshashan Formation; N22 = Neogene upper Youshashan Formation; N23 = Neogene Shizigou Formation; Q1+2 = Quaternary Qigequan Formation.

Examples of pore-pressure depth profiles in overpressured wells in the nort... Available to Purchase

Published: 01 January 2016
Jurassic; N 1 = Neogene Upper Ganchaigou Formation; N 2 1 = Neogene lower Youshashan Formation; N 2 2 = Neogene upper Youshashan Formation; N 2 3 = Neogene Shizigou Formation; Q 1+2 = Quaternary Qigequan Formation.
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Grain-size parameters of the Cenozoic strata of the Dahonggou Section of the Qaidam Basin on the northeast Tibetan Plateau. See the text for the detailed calculations of these parameters. The calculations of the parameters and their categories follow Blott and Pye (2001) and Folk and Ward (1957). (A) Mean size (in Φ values). (B) Sorting. (C) Skewness. (D) Kurtosis. (E) Global deep-sea oxygen isotope (δ18O‰) (500-point smoothing) (Westerhold et al., 2020). Blue lines—raw data; black lines—10-point running average; red shadow—ca. 9 Ma; gray shadow—mid-Miocene Climatic Optimum (MMCO). SZG—Shizigou Formation; SYSS—Shangyoushashan Formation; XYSS—Xiayoushashan Formation; SGCG—Shangganchaigou Formation; XGCG—Xiaganchaigou Formation.

Grain-size parameters of the Cenozoic strata of the Dahonggou Section of th... Available to Purchase

Published: 13 December 2024
(MMCO). SZG—Shizigou Formation; SYSS—Shangyoushashan Formation; XYSS—Xiayoushashan Formation; SGCG—Shangganchaigou Formation; XGCG—Xiaganchaigou Formation.
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Burial, temperature, and maturity history in a northeast-southwest two-dimensional section extracted from the three-dimensional volume (the location of the profile is shown in Figure 12A). E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; J1 = Lower Jurassic; J2 = Middle Jurassic; N1 = upper Ganchaigou Formation; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation; Q1+2 = Quaternary Qigequan Formation.

Burial, temperature, and maturity history in a northeast-southwest two-dime... Available to Purchase

Published: 12 May 2021
= upper member of the lower Ganchaigou Formation; J 1 = Lower Jurassic; J 2 = Middle Jurassic; N 1 = upper Ganchaigou Formation; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation; Q 1+2 = Quaternary Qigequan Formation.
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Comparison of the measured and simulated vitrinite reflectance (Ro) in the northern margin of the Qaidam Basin. (A) K2 well, (B) H2 well, (C) YC3 well, and (D) YS1 well. The reticles represent the measured Ro%; solid lines represent the simulated Ro (EASY%Ro). E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; N1 = upper Ganchaigou Formation; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation; Q1+2 = Quaternary Qigequan Formation.

Comparison of the measured and simulated vitrinite reflectance ( R o ) i... Available to Purchase

Published: 12 May 2021
1+2 = Paleogene Lulehe; E 3 1 = lower member of the lower Ganchaigou Formation; E 3 2 = upper member of the lower Ganchaigou Formation; N 1 = upper Ganchaigou Formation; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation; Q 1+2
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Comparison of the measured and simulated temperatures in the northern margin of the Qaidam Basin. (A) LQ1 well, (B) X6 well, (C) S86 well, and (D) H2 well. The reticles represent the measured temperature; solid lines represent the simulated temperatures. E1+2 = Paleogene Lulehe; E31 = lower member of the lower Ganchaigou Formation; E32 = upper member of the lower Ganchaigou Formation; J1 = Lower Jurassic; J2 = Middle Jurassic; N1 = upper Ganchaigou Formation; N21 = lower Youshashan Formation; N22 = upper Youshashan Formation; N23 = Shizigou Formation; Q1+2 = Quaternary Qigequan Formation.

Comparison of the measured and simulated temperatures in the northern margi... Available to Purchase

Published: 12 May 2021
1 = lower member of the lower Ganchaigou Formation; E 3 2 = upper member of the lower Ganchaigou Formation; J 1 = Lower Jurassic; J 2 = Middle Jurassic; N 1 = upper Ganchaigou Formation; N 2 1 = lower Youshashan Formation; N 2 2 = upper Youshashan Formation; N 2 3 = Shizigou Formation; Q
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Correlation chart of Cenozoic strata in basins of the central Tibetan Plateau and Qaidam Basin. Key at bottom: 1—conglomerate; 2—sandstone; 3—shale; 4—mudstone and silty mudstone; 5—marl; 6—dolostone and dolomitic limestone; 7—sandy limestone; 8—limestone; 9—andesite and rhyolite; 10—unconformity and missing strata. E1n—Paleocene Niubao Formation; N11—lower Miocene; N13 —upper Miocene; N21 —lower Pliocene; N2b—Pliocene Bulong Formation; N2s—Pliocene Shizigou Formation.

Correlation chart of Cenozoic strata in basins of the central Tibetan Plate... Available to Purchase

Published: 01 September 2008
—unconformity and missing strata. E 1n —Paleocene Niubao Formation; N 1 1 —lower Miocene; N 1 3 —upper Miocene; N 2 1 —lower Pliocene; N 2b —Pliocene Bulong Formation; N 2s —Pliocene Shizigou Formation.
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Examples of seismic lines used in this study. (A) Section 7. (B) Southernmost segment of section 3. (C) Northernmost segment of section 4. See Figure 3 for locations. T0 to T6 are regionally correlative seismic reflectors; their relationships to Mesozoic and Cenozoic stratigraphic units are shown in Table 1. TWTT—two-way traveltime. T0 to T6 are regionally correlative reflectors. T0 at the top of the Shizigou formation, T1 at the top of the Shangyoushashan formation, T2 at the top of the Xiayoushashan formation, T3 at the top of the Shangganchaigou formation, T4 at the top of the Upper Xiagangchaigou formation, T5 at the top of the Lower Xiaganchaigou formation, TR at the top of the Lulehe formation, and T6 at the top of the Jurassic-Cretaceous strata.

Examples of seismic lines used in this study. (A) Section 7. (B) Southernmo... Available to Purchase

Published: 01 July 2008
units are shown in Table 1 . TWTT—two-way traveltime. T0 to T6 are regionally correlative reflectors. T0 at the top of the Shizigou formation, T1 at the top of the Shangyoushashan formation, T2 at the top of the Xiayoushashan formation, T3 at the top of the Shangganchaigou formation, T4 at the top
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Contributing percentages of the grain-size components of the Cenozoic strata of the Dahonggou Section of the Qaidam Basin on the northeast Tibetan Plateau. Categorizing classes follow Udden (1914) and Wentworth (1922). (A) Clay. (B) Silt. (C) Very fine sand. (D) Fine sand. (E) Medium sand. (F) The mixture of coarse sand and granule. (G) The cumulative percentage of all grain-size compositions. (H) Global deep-sea oxygen isotope (δ18O‰) (500-point smoothing) (Westerhold et al., 2020). Colored lines—raw data; black lines—10-point running average; pink shadow—ca. 9 Ma; gray shadow—mid-Miocene Climatic Optimum (MMCO at ca. 17–14 Ma). SZG—Shizigou Formation; SYSS—Shangyoushashan Formation; XYSS—Xiayoushashan Formation; SGCG—Shangganchaigou Formation; XGCG—Xiaganchaigou Formation.

Contributing percentages of the grain-size components of the Cenozoic strat... Available to Purchase

Published: 13 December 2024
shadow—mid-Miocene Climatic Optimum (MMCO at ca. 17–14 Ma). SZG—Shizigou Formation; SYSS—Shangyoushashan Formation; XYSS—Xiayoushashan Formation; SGCG—Shangganchaigou Formation; XGCG—Xiaganchaigou Formation.