Diagenetic evolution and formation mechanisms of middle to deep clastic reservoirs in the Nanpu sag, Bohai Bay Basin, East China

Wang, Enze; Liu, Guoyong; Pang, Xiongqi; Li, Changrong; Wu, Zhuoya

doi:10.1016/s1876-3804(20)60051-9

Cited by 24 publications

(21 citation statements)

References 31 publications

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“…Much research has been done on the burial and hydrocarbon generation history of the Carboniferous Permian source rocks in the study area (Teillet et al 2019;Wang et al 2020a). The predecessors agreed that the natural gas in the reservoirs of the study area was generated in two processes.…”

Section: Continuous Burial Acid Diagenesis Stagementioning

confidence: 99%

Coupling between tectonic activity and diagenetic evolution of a clastic buried hill—a case study from Gubei low buried hill in Jiyang Depression of Bohai Bay Basin

et al. 2021

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This paper aims to gain new insights into clastic buried hill reservoirs. For this purpose, the Permian sandstone reservoirs in the Upper Shihezi Formation, Gubei low buried hill, Jiyang Depression, was taken as the object. Referring to the evolution histories of reservoirs and tectonics, the diagenesis of the reservoirs and its coupling with tectonic activity were investigated, with the aid of techniques like core observation, casting sheet observation, scanning electron microscopy (SEM), cathode luminescence, electron probe, back scattering, fluid inclusion, and pore permeability tests. The results show that the Permian sandstone reservoirs in the Upper Shihezi Formation, Gubei low buried hill, Jiyang Depression, are low-porosity, low-permeability reservoirs with complex diagenesis. The diagenetic evolution sequence can be summarized as early feldspar corrosion/kaolinite cemention/early pyrite cemention→carbonate cemention/secondary enlargement of quartz→quartz corrosion/corrosion of quartz and its secondary enlargement→late calcite cemention→late pyrite cemention/carbonate corrosion/late feldspar corrosion/corrosion of dissolvable miscellaneous matrix; compaction effect exists throughout the evolution process. The reservoirs went through (I) shallow burial epidiagenesis, (II) near-surface hydrothermal diagenesis, (III) deep burial alkaline diagenesis, and (IV) continuous burial acid diagenesis. The diagenetic evolution of these four stages is significantly affected by tectonic activities, and the article lists the evidence that diagenesis is affected by tectonic activity. The research results lay the basis for the prediction and evaluation of the Permian sandstone reservoirs in the Upper Shihezi Formation, Gubei low buried hill, Jiyang Depression, and shed new light on the exploration of tight sandstone reservoirs.

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Section: Continuous Burial Acid Diagenesis Stagementioning

confidence: 99%

Coupling between tectonic activity and diagenetic evolution of a clastic buried hill—a case study from Gubei low buried hill in Jiyang Depression of Bohai Bay Basin

et al. 2021

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“…The Shahejie (Es), Dongying (Ed), Guantao (Ng) and Minghuazhen (Nm) Formations are deposited from bottom to top. The depositional environment of the Es Formation is braided-river-delta facies, that of the Ed Formation is shore-shallow-lake facies, and the environments of the Ng and Nm Formations are mainly fluvial facies (Guo et al, 2013;Wang et al, 2019bWang et al, , 2020aWang et al, , 2020c. The Nanpu Sag experienced the same multi-episodic rifting evolution as the North China platform, forming a number of regional unconformities.…”

Section: Geological Backgroundsmentioning

confidence: 99%

“…High-quality sandstone reservoirs with a permeability of 100 $ 1000 Â 10 À3 lm 2 , porosity of more than 15% and relatively coarse grain size have also been found in the deep layer (depth of more than 4000 m) of the No. 3 structural belt, especially in the PG2 oil field, and industrial oil and gas flow has been obtained (Wang et al, 2020a;Wu et al, 2019). Numerous studies have been conducted on the medium-deep reservoirs in the Nanpu Sag, focusing on different aspects including genetic mechanisms, the main controlling factors and the oil and gas resources of high-quality deep reservoirs (Pang et al, 2019;Wang et al, 2019aWang et al, , 2020aWu et al, 2019), however, the study area has strong heterogeneity and complex diageneses (Lai et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

“…3 structural belt, especially in the PG2 oil field, and industrial oil and gas flow has been obtained (Wang et al, 2020a;Wu et al, 2019). Numerous studies have been conducted on the medium-deep reservoirs in the Nanpu Sag, focusing on different aspects including genetic mechanisms, the main controlling factors and the oil and gas resources of high-quality deep reservoirs (Pang et al, 2019;Wang et al, 2019aWang et al, , 2020aWu et al, 2019), however, the study area has strong heterogeneity and complex diageneses (Lai et al, 2018a). Different diageneses lead to great differences in reservoir quality, and there is no systematic study on the diagenetic facies of reservoirs, which restricts the subsequent exploration and development.…”

Section: Introductionmentioning

confidence: 99%

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Diagenetic facies and reservoir porosity evaluation of deep high-quality clastic reservoirs: A case study of the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, China

Yang

Wang

et al. 2021

Energy Exploration & Exploitation

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Petrological analysis, thin-section observation and laboratory analysis data were selected to systematically study the physical and diagenetic features of the first member of the Paleogene Shahejie Formation (Es1) in the No. 3 structural belt of the Nanpu Sag, Bohai Bay Basin. The intensities of different diagenetic processes were determined, the diagenetic evolution sequence was reconstructed, the typical diagenetic facies were identified and the effects of different diageneses on the reservoir were quantitatively analyzed. The results show that the main intergranular fillings include authigenic-quartz, quartz secondary enlargement, clay minerals, carbonate cement and matrix. The pore types include intergranular porosity, dissolution porosity and microfractures. The reservoir has experienced compaction, early cementation, dissolution and late cementation, among which compaction is the most important porosity reducer. Compaction was the main diagenetic process involved in porosity reduction, accounting for about 24.4% of the loss of thin-section porosity. The dissolution process clearly improved the porosity, increasing thin-section porosity by 2.7%. Five diagenetic facies were identified on the basis of petrographic analyses, namely, (a) strongly compacted-weakly cemented-weakly dissolved facies; (b) weakly compacted-strongly cemented-weakly dissolved facies; (c) moderately compacted-moderately cemented-weakly dissolved facies; (d) strongly compacted-weakly cemented-moderately dissolved facies; and (e) strongly compacted-weakly cemented-strongly dissolved facies. According to the analysis of diagenesis intensity, the porosity evolution model of various diagenetic facies was reconstructed, and the reservoir quality of various diagenetic facies was quantitatively predicted. The reservoir quality of different diagenetic facies clearly changed with depth. The best reservoir quality was in strongly compacted–weakly cemented–strongly dissolution facies, which have good sorting, contain a large amount of feldspar and soluble debris, and are mainly developed in the main part of the river channel. Our study can provide a reference for the subsequent exploration and development of deep petroleum systems.

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“…Many studies have been conducted on Es 3 , including the characteristics and diagenesis evolution of sandstone reservoirs, source rock assessments, and petroleum system resource evaluation (Gao, Zhang, Li, & Yu, 2016; Wang et al, 2020; Wang, Pang, et al, 2019; Wang, Liu, Pang, Li, Wu, 2020; Zheng, Dong, Zhu, Wang, & Xiong, 2007). However, the hydrocarbon expulsion characteristics of source rocks and the relationship between the phase of hydrocarbon expulsion and the sandstone reservoir densification is less well‐understood.…”

Section: Introductionmentioning

confidence: 99%

Organic geochemistry, hydrocarbon generation, and expulsion characteristics and their impact on tight oil: A case study of the third member of the Upper Palaeogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, NE China

Pang

Wang

et al. 2020

Geological Journal

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In recent years, exploration of tight oil in the Nanpu Sag has made significant progress in the third member of the Upper Palaeogene Shahejie Formation (Es3) in the Nanpu Sag, Bohai Bay Basin, Northeast China, showing excellent prospects. However, owing to insufficient understanding of the hydrocarbon generation and expulsion characteristics of Es3 source rocks and their matching relationship with the reservoir tightening time, the genetic type and resource potential of tight oil systems are not precise, which limits the further exploration of tight oil. In this study, the geological and geochemical characteristics of Es3 source rock are identified through a comprehensive geological and organic geochemistry analysis. In addition, hydrocarbon generation and expulsion patterns are established using a hydrocarbon generation potential model. On the basis of these results, combined with sandstone reservoir evolution histories, we have identified the genetic type and resource potential of the tight oil. The results show that the kerogen types of the Es3 source rocks of the Nanpu Sag, are widely distributed in an area of nearly 1,000 km2 and have a large thickness of more than 700 m, are mainly Types II and III with a high average total organic carbon (TOC) value of 1.63%. Moreover, the source rocks are primarily in the mature stage, with an average vitrinite reflectance (Ro) of 1.06%. The Es3 source rock reached the hydrocarbon expulsion threshold at Ro = 0.7%, and the hydrocarbon expulsion efficiency was approximately 70%. Two hydrocarbon generation and expulsion centres are identified, the Gaoshangpu and Laoyemiao structural belts, with maximum hydrocarbon generation and expulsion intensities of 100 × 106 t/km2 and 80 × 106 t/km2, respectively. In addition, two genetic types of tight oil are identified with accumulation before and after tightening, respectively. The resources of these types are 2.3 × 108 t and 20.4 × 108 t, respectively, with a total of 22.7 × 108 t, which indicates significant prospects for tight oil exploration.

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Diagenetic evolution and formation mechanisms of middle to deep clastic reservoirs in the Nanpu sag, Bohai Bay Basin, East China

Cited by 24 publications

References 31 publications

Coupling between tectonic activity and diagenetic evolution of a clastic buried hill—a case study from Gubei low buried hill in Jiyang Depression of Bohai Bay Basin

Coupling between tectonic activity and diagenetic evolution of a clastic buried hill—a case study from Gubei low buried hill in Jiyang Depression of Bohai Bay Basin

Diagenetic facies and reservoir porosity evaluation of deep high-quality clastic reservoirs: A case study of the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, China

Organic geochemistry, hydrocarbon generation, and expulsion characteristics and their impact on tight oil: A case study of the third member of the Upper Palaeogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, NE China

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