The geochemical characteristics of the Paleogene lacustrine source rock and Cenozoic oil in the eastern Huanghekou Sag, Bohai Bay Basin, China: An oil–source rock correlation

Lan, Xiaodong; Liu, Hao

doi:10.1016/j.petrol.2022.110434

Cited by 12 publications

(6 citation statements)

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“…However, through the detection of some compounds, it can also be seen that the closer δ 13 C value and similar trends can be used for oil source comparison. In general, the δ 13 C difference between oils does not exceed 2-3‰ for oils of similar maturity from the same source rock [27,28].…”

Section: Oil-source Correlationmentioning

confidence: 91%

“…The C 27 -C 28 -C 29 steranes are highly specific for correlation purposes. The C 27 steranes are derived from lower aquatic organisms, with C 29 mainly derived from higher plants [28]. The distribution of sterane series in the study samples is mainly C 29 homologs, which account for over 44.9% on average.…”

Section: Oil-source Correlationmentioning

confidence: 95%

“…The E 2 n 1 source rocks have low diasterane/regular sterane values, ranging from 0.16 to 0.28 (0.22 on average). Steranes are mainly derived from algae, higher plants, and zooplankton [28]. The source rocks of the Nadu Formation contain a homologous series of C 27 -C 29 ααα 20R steranes.…”

Section: Characteristics Of Biomarkers From Source Rocksmentioning

confidence: 99%

“…The composition of crude oil is influenced by various factors, such as the depositional environment of the source rock, kerogen type, maturity of the source rock, and migration and accumulation of hydrocarbons. Therefore, it is not effective to determine the source rock of regional crude oils by bulk composition [28,36,37].…”

Section: Oil-source Correlationmentioning

confidence: 99%

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Origin and Geological Significance of Residual Oil in High-Angle Joint Fissures: A Case Study of the Nadu Formation in Baise Basin, South China

Gao,

Liu,

et al. 2023

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The Baise Basin is a Paleogene pull-apart basin with numerous strike-slip faults which are not favorable for hydrocarbon preservation. The Nadu Formation, research object of this paper, is generally rich in oil and contains a large number of high-angle joint fissures. Analyzing the origin of residual oil in high-angle joint fissures can reveal the hydrocarbon migration and accumulation characteristics of the pull-apart-type basins. Molecular geochemical composition characteristics of crude oil and oil source of the Nadu Formation were discussed based on the saturated hydrocarbon biomarker compound and stable carbon isotope distribution of n-alkanes. The studied samples were selected from four members (E2n1, E2n2, E2n3up, and E2n3low) of the Nadu Formation. The results suggested that the average oil content of E2n1 fissures is 0.32 mg/cm2, and the oil distribution is not uniform. The distribution of oil on the fissures of E2n2 and E2n3 is uniform and complete, and the oil content reaches 0.53 mg/cm2. The oil in the joint fissures of the Nadu Formation is heavy, as the light hydrocarbon is seriously lost during migration. Thus, the oil in the joint fissures is residue after crude oil loses light components during migration. By comparing the molecular biomarker characteristics and stable carbon isotopic compositions, crude oil of the Nadu Formation can be classified into three categories: E2n1, E2n2 + E2n3up, and E2n3low. The E2n1 oils have the lowest maturity and are sourced from the E2n1 source rocks. Moreover, the maturity of E2n2 and E2n3 samples are relatively high. Biomarker and carbon isotope characteristics of the E2n2 and E2n3up oils are similar, indicating that they are derived from the E2n2 + E2n3up source rocks. The E2n3low oils are the mixture of the crude oil generated from the E2n3up source rocks and the E2n3low source rocks. Results presented show that the residual oil of high-angle joint fissures in the Nadu Formation is contributed by adjacent source rocks. The crude oil discharged from the Nadu Formation can only migrate upward along high-angle joints in a short distance, and the migration distance is usually less than 5 m. In conclusion, although the Nadu Formation has developed a large number of high-angle joint fissures, crude oil in the Nadu Formation has not vertically migrated for long distance along the joint fissures. The well-preserved fractures as important shale oil storage spaces indicate that the Nadu Formation has good shale oil exploration potential. The results may provide insights into the origins of hydrocarbons in the Nadu Formation from the Baise Basin and enhanced knowledge for optimizing future exploration and production.

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Section: Oil-source Correlationmentioning

confidence: 91%

Section: Oil-source Correlationmentioning

confidence: 95%

Section: Characteristics Of Biomarkers From Source Rocksmentioning

confidence: 99%

Section: Oil-source Correlationmentioning

confidence: 99%

See 2 more Smart Citations

Origin and Geological Significance of Residual Oil in High-Angle Joint Fissures: A Case Study of the Nadu Formation in Baise Basin, South China

Gao,

Liu,

et al. 2023

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“…Dark mudstone predominantly occurred in the middle parts of the E2s3, E3s1, and E3d3 formations. The Huanghekou Depression has been extensively studied by previous researchers in terms of the characteristics of its hydrocarbon source rocks, the potential for hydrocarbon accumulation, the formation characteristics of reservoirs, and reservoir development [7][8][9][10][11][12]. Zhuang et al (2010) analysed the formation environment of mud shale; the palaeoenvironment was a hot and humid climate, and palaeoproductivity was high in E2s3.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary Environment and Enrichment of Organic Matter in the Shahejie Formation, Huanghekou Depression, Bohai Bay Basin, China

Jia,

Hou,

2024

Applied Sciences

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As a hydrocarbon-rich depression within the Bohai Bay Basin, the Huanghekou Depression is a focal region for exploring hydrocarbons in the eastern China Sea. Previous studies have insufficiently examined the correlation between the enrichment of organic matter and the environments in which it is deposited. Herein, the hydrocarbon potential, palaeoclimate, sedimentary environment, organic matter sources, and organic matter enrichment of the source rocks of the Shahejie Formation in the Huanghekou Depression were investigated using organic and inorganic geochemical indicators. The organic matter type of the source rock in Huanghekou Depression’s Shahejie Formation was predominantly Type II, with a minor presence of Type III. Furthermore, the source rock had a poor-to-good comprehensive evaluation grade in E3s1–2, whereas E2s3 and E2s4 had medium-to-good comprehensive evaluations in their source rocks. In terms of maturity, E3s1 was in an intermediate position between the immature and mature stages and E3s2 and E2s3 were between the low-maturity and mature stages, whereas E2s4 transitioned into full maturity. Biomarkers and sensitive element indicators indicated that the organic matter in E3s1–2 was primarily derived from lower aquatic organisms and algae. This palaeoclimate was characterised by aridity, a water body containing saline and semi-saline water, and a strongly reducing environment resulting from water body stratification, leading to oxygen deficiency. The organic matter in E2s3 was primarily derived from aquatic organisms and algal inputs; these deposits were formed in a reduced environment characterised by relatively low salinity, ranging between semi-saline and freshwater conditions. The organic matter enrichment model of the Shahejie Formation was established based on sedimentary environment, palaeoclimatic, and organic matter source analyses, utilising E3s1–2 as preservation models and E2s3 as the productivity model. This study provides a basis for in-depth exploration and advancement of oil and gas reserves.

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Study on natural gas-source correlation and hydrocarbon accumulation of the Lianggaoshan Formation in the east of Sichuan Basin, China

Luo,

Gao,

Luo

et al. 2024

Acta Geochim

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The geochemical characteristics of the Paleogene lacustrine source rock and Cenozoic oil in the eastern Huanghekou Sag, Bohai Bay Basin, China: An oil–source rock correlation

Cited by 12 publications

References 59 publications

Origin and Geological Significance of Residual Oil in High-Angle Joint Fissures: A Case Study of the Nadu Formation in Baise Basin, South China

Origin and Geological Significance of Residual Oil in High-Angle Joint Fissures: A Case Study of the Nadu Formation in Baise Basin, South China

Sedimentary Environment and Enrichment of Organic Matter in the Shahejie Formation, Huanghekou Depression, Bohai Bay Basin, China

Study on natural gas-source correlation and hydrocarbon accumulation of the Lianggaoshan Formation in the east of Sichuan Basin, China

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