The formation environment and developmental models of argillaceous dolomite in the Xingouzui Formation, the Jianghan Basin

Li, Wenhao; Lu, Shuangfang; Xue, Haitao; Zhang, Pengfei; Wu, Shiqiang

doi:10.1016/j.marpetgeo.2015.06.011

Cited by 30 publications

(21 citation statements)

References 20 publications

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“…Dilution is defined as the organic-carbon-free sedimentation rate, 6 which is mainly terrigenous detrital matter for lacustrine basins. 25,28 The major element contents of Fe and K can be used to trace the influence of the terrigenous detrital matter. 58 The (Fe + K) contents in the Es 3 L shale are generally greater than that of the Es 3 U shale, indicating that the terrigenous detrital matter amounts are much greater in the Es 3…”

Section: Energy and Fuelsmentioning

confidence: 99%

“…Tyson (1995) and Bohacs et al (2011) proposed that the “dilution” is also a key factor controlling organic matter enrichment. On the basis of the above models, some scholars studied the organic matter enrichment conditions in the shales in the Yangtze Platform, , northern South China Sea, and Jianghan Baisn with respect to paleoproductivity, redox conditions, and dilution. Massive shale oil resources were recently discovered in many SLRBs in China, such as the Paleogene shale oil plays in the Dongpu Depression, Bonan Sag, and Dongying Depression , in the Bohai Bay Basin; Biyang Depression in the Nanxiang Basin, Jianghan Basin; − , and the Permian shale oil plays in the Jimusar Sag in the Junggar Basin. , However, studies on the main factors controlling organic matter enrichment in shales of the SLRBs are still lacking. − Recently, some research started focusing on SLRB shales.…”

Section: Introductionmentioning

confidence: 99%

“…However, two problems still exist: (1) Generally, paleosalinity, dilution, paleoproductivity, and redox conditions together control the organic matter enrichment in shales; for the SLRBs, the paleosalinity condition (paleosalinity) may be particularly important for enrichment, but the other three cannot be ignored. Comprehensive analyses on all four factors were rarely done in past research. ,− (2) When the relationships between the organic matter enrichment and each of the four factors were analyzed, the directly measured total organic carbon (TOC) was adopted to represent the enrichment degree. But the measured TOC is the residual TOC after hydrocarbon expulsion and is smaller than the original TOC even in the oil window; thus, it cannot truly reflect the original organic matter enrichment degree. − …”

Section: Introductionmentioning

confidence: 99%

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Impact of Paleosalinity, Dilution, Redox, and Paleoproductivity on Organic Matter Enrichment in a Saline Lacustrine Rift Basin: A Case Study of Paleogene Organic-Rich Shale in Dongpu Depression, Bohai Bay Basin, Eastern China

Pang

Jiang

et al. 2018

Energy Fuels

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Saline, lacustrine rift basins (SLRBs) can contain very productive shale oil plays, in which "sweet spots" are closely related to organic-rich shale intervals. However, organic matter enrichment in the shale intervals within SLRBs and the controlling factors have not been well-explored in past research. In this study, well Pu6-65 within the Dongpu Depression of the Bohai Bay Basin was systematically cored and analyzed for basic geochemistry, trace elements, clay mineral content, and original total organic carbon (TOC) to understand the relationships between TOC and paleosalinity, dilution, redox, and paleoproductivity. Results indicate that the Es 3 U and Es 3 L (upper and lower third member of the Paleogene Shahejie Formation) in the Dongpu Depression mainly developed in a brackish and weak anoxic to anoxic depositional environment, in which surface water featured relatively low paleoproductivity. In comparison, the dilution degree is stronger in the Es 3 L shale. Paleosalinity, dilution, redox, and paleoproductivity together controlled the organic matter enrichment in the Es 3 U and Es 3 L shales, while the paleosalinity, dilution, and redox condition were much more significant controlling factors than the paleoproductivity. The degree of organic matter enrichment first increases and then tends to decrease with increasing paleosalinity; the enrichment degree gradually decreases with the increasing of the dilution degree and increases with the increasing of the anoxia degree. Therefore, future exploration of organic-rich shales in the Dongpu Depression should target shale intervals developed in the environment of moderate salinity, weak dilution, and strong reducibility. This study not only improves the theory of the organic matter enrichment but also provides guidance for predicting the organic-rich shale distribution in the Dongpu Depression and in other SLRBs around the world.

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Section: Energy and Fuelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Paleosalinity, Dilution, Redox, and Paleoproductivity on Organic Matter Enrichment in a Saline Lacustrine Rift Basin: A Case Study of Paleogene Organic-Rich Shale in Dongpu Depression, Bohai Bay Basin, Eastern China

Pang

Jiang

et al. 2018

Energy Fuels

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“…The concentration of vanadium (V) is higher than nickel (Ni) in most of the analysed shale samples with V/(V + Ni) ratio in the range of 0.48–0.83, indicating that the shales were mainly deposited under anoxic conditions (Table ; Figure ). A high Fe 2+ /Fe 3+ (Table ; Figure ) values represent another strong support of the anoxic water column during the sedimentary period (Li et al, ).…”

Section: Discussionmentioning

confidence: 86%

“…The Yingen‐Ejinaqi Basin in western Inner Mongolia is a large‐scale Mesozoic‐Cenozoic rift‐related basin that is bordered by the Yabulai and Langshan Mountains at the southeast and the Beishan Mountain at the west in northern China. It is one of the rift basins developed in western and northern North China during the Early Cretaceous with alluvial sediments interbedded alkaline volcanic rocks accumulated (Li, Lu, Xue, Zhang, & Wu, ). The basin covering an area of 12.3 × 10 4 km 2 is developed on the Precambrian crystalline block and the Paleozoic fold basement.…”

Section: Geological Settingmentioning

confidence: 99%

Geochemical characteristics, depositional environment, and controlling factors of Lower Cretaceous shales in Chagan Sag, Yingen‐Ejinaqi Basin

et al. 2017

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The Lower Cretaceous shales of Chagan Sag, Yingen‐Ejinaqi Basin, are considered as the source rocks of hydrocarbons discovered in the sag. Borehole shales from the Lower Cretaceous were subjected to comprehensive geochemical study to evaluate the quality of source rock, to reconstruct the paleodepositional environment and to determine the controlling factors of organic matter enrichment. Content of present‐day total organic carbon, and hydrogen index, averaging 1.4% and 259.2 mg hydrocarbon/g total organic carbon, respectively reveal poor to fair quality of organic matter. Average value of vitrinite reflectance (Ro) of 1.0% indicates mature organic matter. Maceral composition and biomarker analysis provide evidence for a mixed aquatic and terrigeous organic matter input. Based on Sr/Cu, Sr/Ba, and gammacerane index, we propose that organic matter was deposited in closed hypersaline under hot and arid climate conditions. The ratios of V/(V + Ni), and pristane/phytane (Pr/Ph), as well as the presence of β‐carotene suggest a stratified water column with anoxic bottom water condition. Low to moderate productivity as a result of deficient nutrient supply, the excellent organic matter preservation condition under stratified anoxic water column and high sedimentary rate controlled the quality of source rock. In addition, influence of factors such as content of clay minerals on organic matter enrichment cannot be ignored.

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Hydrocarbon dominant migration direction and accumulation mode in Qijiang area, Sichuan Basin, China

Cheng

Ding

et al. 2023

Geological Journal

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The high‐quality hydrocarbon source rocks developed in the Longtan Formation of the Qijiang area and the good reservoir capacity of the overlying dolomite of the Jialingjiang Formation indicate that the area has great exploration potential. To clarify the hydrocarbon migration and accumulation characteristics of the area, the fluid potential of the Longtan Formation in the Qijiang area in the Early Jurassic was determined. The direction of the maximum negative gradient of the fluid potential indicates the direction of the primary migration of hydrocarbons, and the structural ridge theory is used to analyse the direction of the secondary migration of hydrocarbons. The results show that the fluid potential of the hydrocarbon source rocks of the Longtan Formation in the Early Jurassic is characterized by the alternate distribution of high potential zones and low‐potential zones. The central syncline, eastern syncline and western syncline are drainage zones and high potential zones, while the Shiyougou structural belt and Fo'er Ya structural belt are supply zones and low‐potential zones. The oil and gas fluids migrate from the east–west direction to the anticlinal zone for the primary migration; the structural ridge controls the secondary migration of oil and gas in the low‐potential area along the north–south direction, resulting in a zonal distribution of oil and gas traps along the structural ridge. By combining fluid potential and structural ridge characteristics to determine the dominant direction of primary and secondary hydrocarbon migration, a model of hydrocarbon migration and accumulation in the Qijiang area is developed, which provides an important basis for finding hydrocarbon reservoirs.

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The formation environment and developmental models of argillaceous dolomite in the Xingouzui Formation, the Jianghan Basin

Cited by 30 publications

References 20 publications

Impact of Paleosalinity, Dilution, Redox, and Paleoproductivity on Organic Matter Enrichment in a Saline Lacustrine Rift Basin: A Case Study of Paleogene Organic-Rich Shale in Dongpu Depression, Bohai Bay Basin, Eastern China

Impact of Paleosalinity, Dilution, Redox, and Paleoproductivity on Organic Matter Enrichment in a Saline Lacustrine Rift Basin: A Case Study of Paleogene Organic-Rich Shale in Dongpu Depression, Bohai Bay Basin, Eastern China

Geochemical characteristics, depositional environment, and controlling factors of Lower Cretaceous shales in Chagan Sag, Yingen‐Ejinaqi Basin

Hydrocarbon dominant migration direction and accumulation mode in Qijiang area, Sichuan Basin, China

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