Effective fractures linked with tectonic reactivation and multiple genetic fluids in the ultradeep Paleozoic carbonate buried hills of the Bozhong sag, North China

Ye, Tao; Chen, Anqing; Niu, Chengming; Luo, Jian; Hou, Mingcai

doi:10.1016/j.marpetgeo.2022.105642

Cited by 8 publications

(6 citation statements)

References 104 publications

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“…Based on the analysis of regional tectonic evolution, we analyzed the main fracture initiation events and their role in forming fractures. The carbon and oxygen isotopes of these samples were measured using a mass spectrometer (2019.FLS0167/SN09609D) in the Experimental Center of China National Offshore Oil Corporation (Ye et al, 2022a). In combination with the C and O isotope measurements of fracture fillings, we discussed the source of diagenetic fluids.…”

Section: Geological Settingmentioning

confidence: 99%

“…Carbonate is an important lithology for hydrocarbon accumulation. Globally, nearly 50% of oil reserves and 25% of gas reserves are endowed in carbonate reservoirs (Li et al, 2016;Ye et al, 2022a). Previous studies have confirmed that karstification is an important factor in controlling the development of carbonate reservoirs.…”

Section: Introductionmentioning

confidence: 97%

“…In the offshore Bohai Sea, the most active tectonic area in the Bohai Bay Basin, the Lower Paleozoic reservoirs develop many types and multi-scales of natural fractures as a result of multiple tectonic movements and diagenetic processes in the geological period (Li et al, 2023). The existence of fractures is crucial to reservoir development and hydrocarbon enrichment in the Lower Paleozoic (Ye et al, 2022a). In addition, the later dissolution of multi-source fluids along the fractures greatly improved the physical properties of the reservoirs, forming extensive fractured-dissolved reservoirs (Hua et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and formation mechanism of Carbonate buried hill fractured-dissolved reservoirs in Bohai Sea, Bohai Bay basin, China

Huang

Yang²,

Ye³

et al. 2023

Front. Earth Sci.

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Carbonate buried hill madeexploration breakthroughs recently in the offshore Bohai Bay Basin, China, but the plane distribution of the buried hill reservoirs are unclear due to the highly heterogeneous. Taking the CFD2 oilfield as an example, based on core, thin section, seismic, and well logging data, the characteristics of Carbonate buried hill reservoirs in the study area were clarified, the formation mechanism of the reservoirs was discussed, and the development model of the reservoir was established. The results show that the reservoirs are mainly fractured-dissolved reservoirs, and the formation of the reservoirs is mainly related to structural fractures and fluid dissolution along the fractures. The NWW-trending structural fractures were formed under the control of the Indosinian compression, and the NEE-trending structural fractures were formed under the control of the Yanshanian strike-slip transpression. Dolomite is more brittle than limestone and is the main lithology for forming effective fractures. Structural fractures provide favorable channels for atmospheric water dissolution. The C and O isotope values reveal that at least two stages of dissolution have occurred in the study area which are supergene karstification and burial karstification. A model of the fractured-dissolved reservoir under the control of “structure-lithology-fluid” was established. This model highlights that the structural fractures formed by tectonic activities are crucial to reservoir development, and lithology is the internal factor controlling reservoir distribution. Dolomite exhibits the compressive strength of only half of the limestone, and it is the dominant lithology for reservoir development. The dissolution of atmospheric water in the two stages along the fractures greatly improved the physical properties of the reservoirs, and it is the guarantee for the development of effective reservoirs.

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Characteristics and formation mechanism of Carbonate buried hill fractured-dissolved reservoirs in Bohai Sea, Bohai Bay basin, China

Huang

Yang²,

Ye³

et al. 2023

Front. Earth Sci.

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“…The Lower Palaeozoic stratigraphic sequence and reservoir‐cap assemblage in the offshore Bohai Bay Basin (after Ye et al, 2022)…”

Section: Geology Settingmentioning

confidence: 99%

“…Previous studies revealed that the carbonate reservoirs in the offshore BBB are composed of fractures and dissolved pores (Chen et al, 2016; Ye et al, 2022). In addition to the reservoirs associated with unconformities, reservoirs are also developed inside buried hills (H. B. Yu, Wang, et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China

Chen

Niu

et al. 2022

Geological Journal

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A set of marine carbonates was deposited in the Palaeozoic of the North China Craton, which is the dominant sequence for buried hill hydrocarbon exploration. This study focuses on the lithofacies and reservoirs developed in the sequence. Based on the data of cores, thin sections, drilling, and logging, the characteristics of the sequence stratigraphic framework and its control on lithofacies and reservoirs of the Lower Palaeozoic buried hills in the offshore Bohai Bay Basin are discussed.The results show that there developed 4 second-order sequences and 21 third-order sequences in the study area. Due to the deep burial depth, the dolomite is more likely to form high-quality reservoirs than limestone in the study area, and we define the dolomitic tidal flat-dominant sequences as 'favorable reservoir sequences'. There developed unconformity-related reservoirs and inner reservoirs in the buried hill, and the 'favourable reservoir sequences' present obvious control on both reservoirs, showing: (i) 'favourable reservoir sequences' and weathering interface control on the scale of the unconformity-related reservoir jointly, and (ii) the inner reservoirs developed within 'favourable reservoir sequences' as well, and the top and bottom of the high-frequency sequences are the predominant areas for the bedding karst reservoir distribution.

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The formation and architecture of Penglai granite intrusion reservoir along the Tanlu strike-slip fault: Implications for basement exploration in the offshore Bohai Bay Basin, North China

et al. 2023

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Effective fractures linked with tectonic reactivation and multiple genetic fluids in the ultradeep Paleozoic carbonate buried hills of the Bozhong sag, North China

Cited by 8 publications

References 104 publications

Characteristics and formation mechanism of Carbonate buried hill fractured-dissolved reservoirs in Bohai Sea, Bohai Bay basin, China

Characteristics and formation mechanism of Carbonate buried hill fractured-dissolved reservoirs in Bohai Sea, Bohai Bay basin, China

Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China

The formation and architecture of Penglai granite intrusion reservoir along the Tanlu strike-slip fault: Implications for basement exploration in the offshore Bohai Bay Basin, North China

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