Petroleum in Basement Rocks

P'An, Chung-Hsiang

doi:10.1306/03b5a994-16d1-11d7-8645000102c1865d

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…In the Qianmiqiao buried-hill, the Ordovician oils were derived from the Lower Tertiary Shahejie Formation mudstones and this condition makes it favorable for the generation of oil in the Lower Tertiary strata in the trough to migrate laterally and to accumulate at the top of the Ordovician carbonate strata (P'an Chung-Hsiang, 1982). It is shown that the Upper Jurassic-Lower Cretaceous oils were not derived from the Ordovician and Tertiary source rocks.…”

Section: Oil-source Correlationsmentioning

confidence: 99%

Oil-source correlation of the pre-Tertiary in the Huanghua Depression: Insights from stable carbon isotopes and molecular markers

Yang

Zhang

et al. 2008

Chin. J. Geochem.

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Stable carbon isotopes were used together with molecular markers to constrain genetic relationships between sandstone extracts and potential source rocks in the pre-Tertiary in the Huanghua Depression, North China. Comparison of the extracts from Permo-Carboniferous terrigenous mudstones and Ordovician marine carbonates indicated that their prominent differences are in stable carbon isotopes, molecular markers and thermal maturity. Although the extracts of the Mesozoic and Lower Permian Xiashihezi Formation sandstones have some similar isotopic characteristics, molecular markers data provide a good correlation between the Upper Jurassic-Lower Cretaceous oils and the Upper Carboniferous Taiyuan Formation mudstones, and between the Lower Permian Xiashihezi Formation oils and the Lower Permian mudstones. The results showed that the Upper Jurassic-Lower Cretaceous sandstone oils were derived chiefly from the Upper Carboniferous Taiyuan Formation terrigenous mudstones and that the Lower Permian Xiashihezi Formation oils were sourced from the Lower Permian Shanxi Formation and Xiashihezi Formation terrigenous mudstones.

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Section: Oil-source Correlationsmentioning

confidence: 99%

Oil-source correlation of the pre-Tertiary in the Huanghua Depression: Insights from stable carbon isotopes and molecular markers

Yang

Zhang

et al. 2008

Chin. J. Geochem.

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“…With the advancement of exploration technology and the broadening of exploration scope, the buried hill reservoir situated on an unconformity surface within a bedrock reservoir has emerged as a significant area for oil and gas exploration and accumulation [1,2]. Large reserves have been uncovered in several oil and gas fields worldwide, including the Qiongdongnan buried hill field in China, the Baihu field in the Mekong Basin of Southeast Asia and the fields in the Bongor and Sirte Basins of Africa [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A New Approach of Well Productivity Evaluation for Fractured Buried Hill Gas Reservoirs Based on Imaging Logging Data

Bi,

Chen

2023

Applied Sciences

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Fractures function as storage spaces and effective seepage channels for metamorphic rock buried hill reservoirs. Their effectiveness and permeability govern the content and enrichment of oil and gas. Owing to the convoluted distribution patterns of fractures, it is arduous to gauge the effectiveness and permeability of fractures with precision, thus rendering well productivity prediction difficult. This article cites fractured gas reservoirs in a metamorphic rock buried hill as an example. Through comprehensive usage of core and imaging logging data to finely interpret fractures, calculate the fracture parameters that control productivity, including fracture density, fracture width, and fracture porosity. According to the evaluation index of fracture effectiveness, the method of constructing effectiveness index is proposed to quantitatively evaluate the effectiveness. Combined with the study of the law of influence of fracture parameters on reservoir permeability, the permeability index is established to reflect permeability. Productivity coefficients for fractured reservoirs with pollution factors have been established by using well-test interpretation data. To evaluate the well productivity of buried hill reservoirs, a productivity assessment chart is constructed by integrating the fracture effectiveness index, permeability index, and productivity coefficient. This chart enables prompt predictions of the buried hill reservoir’s productivity. In order to verify the reliability of the method, a comprehensive comparison is made through conventional, array acoustic logging data and test data. The results show that the method is well applied in the evaluation of metamorphic rock buried hill reservoirs and provides a new idea for the rapid prediction of well productivity.

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“…Basement reservoirs usually refer to traps that accumulate oil and gas in topographic uplifts of basement rocks under unconformities, which are covered by younger sediments [1][2][3][4]. Based on their location in topographic uplifts, these reservoirs are divided into weathering crusts and inner Energies 2020, 13, 4635; doi:10.3390/en13184635 www.mdpi.com/journal/energies…”

Section: Introductionmentioning

confidence: 99%

“…As an important type of unconventional petroleum system for further exploration and development, basement reservoirs are receiving increasing attention worldwide, and hydrocarbons are being exploited from them in areas such as China, North Africa, the USA, and Southeast Asia [1,2,11,12]. Considering recent advancements in production technology and demand for more resources, research to extract oil and gas from the deep inner reservoirs of basements is growing as well [6,13,14].…”

Section: Introductionmentioning

confidence: 99%

Natural Fractures in Carbonate Basement Reservoirs of the Jizhong Sub-Basin, Bohai Bay Basin, China: Key Aspects Favoring Oil Production

Liu

Zeng

Chun-yuan³

et al. 2020

Energies

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Analysis of natural fractures is essential for understanding the heterogeneity of basement reservoirs with carbonate rocks since natural fractures significantly control key attributes such as porosity and permeability. Based on the observations and analyses of outcrops, cores, borehole image logs, and thin sections from the Mesoproterozoic to Lower Paleozoic in the Jizhong Sub-Basin, natural fractures are found to be abundant in genetic types (tectonic, pressure-solution, and dissolution) in these reservoirs. Tectonic fractures are dominant in such reservoirs, and lithology, mechanical stratigraphy, and faults are major influencing factors for the development of fractures. Dolostones with higher dolomite content are more likely to have tectonic fractures than limestones with higher calcite content. Most tectonic fractures are developed inside mechanical units and terminate at the unit interface at nearly perpendicular or high angles. Also, where a thinner mechanical unit is observed, tectonic fractures are more frequent with a small height. Furthermore, the dominant direction of tectonic fractures is sub-parallel to the fault direction or oblique at a small angle. In addition, integrating diverse characteristics of opening-mode fractures and well-testing data with oil production shows that, in perforated intervals where dolostone and limestone are interstratified or dolostone is the main lithologic composition, fractures are developed well, and the oil production is higher. Moreover, fractures with a larger dip angle have bigger apertures and contribute more to oil production. Collectively, this investigation provides a future reference for understanding the importance of natural fractures and their impact on oil production in the carbonate basement reservoirs.

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Petroleum in Basement Rocks

Cited by 11 publications

References 22 publications

Oil-source correlation of the pre-Tertiary in the Huanghua Depression: Insights from stable carbon isotopes and molecular markers

Oil-source correlation of the pre-Tertiary in the Huanghua Depression: Insights from stable carbon isotopes and molecular markers

A New Approach of Well Productivity Evaluation for Fractured Buried Hill Gas Reservoirs Based on Imaging Logging Data

Natural Fractures in Carbonate Basement Reservoirs of the Jizhong Sub-Basin, Bohai Bay Basin, China: Key Aspects Favoring Oil Production

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