Mixing Characteristics of Oil Inclusions with Different Thermal Maturities in the Wenliu Uplift, Dongpu Depression, Bohai Bay Basin, North China

Liu, Xiuyan; Chen, Honghan; Xiao, Xuewei; Zhang, Hongan; Xu, Tao

doi:10.1007/s12583-020-1356-0

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…Nearly 70% of samples have a TOC content of less than 0.4%, and only 10% of the samples are greater than 1.0% in the southern salt-free area. In the lower and middle sub-member of Es3, the organic matter abundance of the source rocks is high and is classified as "good" source rocks (Liu et al, 2020). However, the organic matter abundance of the shale in the undeveloped area of the Es3 upper sub-member is relatively low, which is classified as a "poor" source rock (Table 1).…”

Section: Organic Matter Abundancementioning

confidence: 99%

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Study on gas accumulation conditions of continental shale in Es3 member in the northern dongpu depression, eastern China

et al. 2022

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The organic-rich shales in the northern Dongpu Depression were deposited in deep and semi-deep lakes based upon evidence from the geochemical characteristic and rock mineral of the Es3 member. The results show that these rocks gradually decrease in abundance and deterioration of organic matter types from the center of the salt lake towards the edges. The development of high-quality shales in Es3 member is due to stratified sedimentation of a deep water, narrow basin water body. The saline lake region has a high TOC content, primarily type I derived from low-grade aquatic organisms. The minerals consist of a variety of mainly clay minerals (31–71%), quartz (11.2–57.9%), plagioclase (3.3–22.1%), dolomite (1.8–19.9%), and pyrite (1–4.1%). The water body was mainly brackish to super-brackish, which has solid limitations and severe salinity stratification, resulting in stable anoxic conditions of the bottom water and conducive to preserving organic matter. The shales were divided into massive silty shale facies, laminated paste shale facies, and laminated gray shale facies according to the mineral composition and microstructure. Comparing the geochemical characteristics, the laminated calcareous shale lithofacies of the deep to semi-deep lacustrine environments favor shale oil and gas occurrence. Pores consist of inorganic pores (intergranular mineral pores, dissolution pores, clay mineral interlayer cracks, mineral intergranular pores micropores, dissolution pores, clay mineral layer cracks, and cracks) with relatively few organic pores. There are many types of natural gas in the study area. The oil-type gas came from the lacustrine shale rock in Es3 member of Shahejie Formation, the coal-derived gas came from the high mature coal-based gas in the deep Carboniferous-Permian system, and the mixed gas was the mixed source of the above two source rocks. Multiple sets of overlying halite provided adequate seals within the depression and were conducive to the accumulation and preservation of hydrocarbons throughout the basin.

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Section: Organic Matter Abundancementioning

confidence: 99%

“…Furthermore, the Paleogene source rocks in the Dongpu Depression are mainly mature-highly mature, and the most high-quality source rocks are found throughout the northern Dongpu Depression. These factors allow for more abundant oil and gas resources in the northern Dongpu Depression (Liu et al, 2020;Lu et al, 2021).…”

Section: Organic Matter Typesmentioning

confidence: 99%

Study on gas accumulation conditions of continental shale in Es3 member in the northern dongpu depression, eastern China

et al. 2022

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Depositional environment and sediment provenance of the third member of the Palaeogene Shahejie Formation in the Nanpu Sag of the Bohai Bay Basin, eastern China: Evidence from trace and rare earth element geochemistry

et al. 2021

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The depositional environment and sediment provenance of the third member of Palaeogene Shahejie Formation (Es3) in the Nanpu Sag of the Bohai Bay Basin, eastern China, are reconstructed by analysing trace element and rare earth element (REE), and the formation mechanism of organic‐matter‐rich shales of the same member is also evaluated. These results show that the terrigenous detrital supply in the Nanpu Sag was relatively sufficient during the Es3 interval, and the total REE contents range from 148.23 to 319.28 ppm, close to or higher than that of the upper crust. The Sr concentrations are 214.22–525.54 ppm and the Sr/Ba ratios are 0.31–0.74, which represent the coexistence of fresh, brackish, and saline waters during the Es3 interval. The V/(V + Ni) ratios of 0.71–0.82, Th/U ratios of 0.82–4.05, and positive δCe anomaly confirm that the water column was suboxic condition, with moderate stratification during the Es3 interval. Comparison of REE behaviours suggests that the Es3 sediments were primarily derived from Yanshanian granites at the Yanshanian fold belt at the active continental margin. The development of organic‐matter‐rich shales in the Es3 member in the Nanpu Sag was closely related to major palaeoenvironmental and palaeogeographical variations in that time, which can be summarized: (a) suitable palaeosalinity as well as sufficient nutrients in water column contributed to the boom of various planktonic algae, improving the production efficiency of aquatic organic matter; (b) suboxic water column slowed down the degradation of oxygen‐sensitive materials during the burial process, enhancing the preservation efficiency of aquatic organic matter.

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Organic matter preservation conditions in the third member of the Shahejie Formation (Dongpu Depression, China)

Liu,

Chen,

et al. 2023

International Journal of Coal Geology

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Mixing Characteristics of Oil Inclusions with Different Thermal Maturities in the Wenliu Uplift, Dongpu Depression, Bohai Bay Basin, North China

Cited by 9 publications

References 15 publications

Study on gas accumulation conditions of continental shale in Es3 member in the northern dongpu depression, eastern China

Study on gas accumulation conditions of continental shale in Es3 member in the northern dongpu depression, eastern China

Depositional environment and sediment provenance of the third member of the Palaeogene Shahejie Formation in the Nanpu Sag of the Bohai Bay Basin, eastern China: Evidence from trace and rare earth element geochemistry

Organic matter preservation conditions in the third member of the Shahejie Formation (Dongpu Depression, China)

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