Hydrocarbon-generation potential of upper Eocene Enping Formation mudstones in the Huilu area, northern Pearl River Mouth Basin, South China Sea

Peng, Junwen; Pang, Xiongqi; Hu, Shi; Peng, Huijie; Xiao, Shuang

doi:10.1306/0926171602417005

Cited by 15 publications

(26 citation statements)

References 30 publications

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“…Active source rocks are sedimentary rocks rich in organic matter and capable of generating hydrocarbons. In the evolution history of a basin that spans over millions of years, source rocks are activated and produce hydrocarbons at certain conditions, such as the generally regarded threshold temperature of 60 • C (Tissot and Welte, 1978;Peters and Cassa, 1994). With a further increase in burial depth of the source rocks, the potential amount of hydrocarbons that can be produced and expelled from the source rocks decreases and eventually approaches zero.…”

Section: Characterization Of Asdlsmentioning

confidence: 99%

“…The interceptions of the envelope lines with these threshold values represent source rocks reaching ASDLs. This envelope method has been widely and successfully employed in a variety of basins in China, and numerous studies containing different geochemical data and mathematical models have been published (Zhou and Pang, 2002;Pang et al, 2004;Jiang et al, 2016;Peng et al, 2018). It is found that the profiles of hydrocarbon generation potential index, V e , and residual hydrocarbons are overall bell-shaped, although details can vary depending on the source rock types (e.g., different lithologies and organic matter types).…”

Section: Asdls In the Six Representative Basinsmentioning

confidence: 99%

“…Original organic matter (or kerogen) in source rocks is generally classified into three types based on its origin (Tissot et al, 1974;Peters and Cassa, 1994). The three types have different organic element compositions and different pyrolytic parameters and therefore have different hydrocarbon generation potentials.…”

Section: Organic Matter Typementioning

confidence: 99%

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The dead line for oil and gas and implication for fossil resource prediction

Pang

Jia

Zhang

et al. 2020

Earth Syst. Sci. Data

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Abstract. Fossil fuel resources are invaluable to economic growth and social development. Understanding the formation and distribution of fossil fuel resources is critical for the search and exploration of them. Until now, the vertical distribution depth of fossil fuel resources has not been confirmed due to different understandings of their origins and the substantial variation in reservoir depths from basin to basin. Geological and geochemical data of 13 634 source rock samples from 1286 exploration wells in six representative petroliferous basins were examined to identify the maximum burial depth of active source rocks in each basin, which is referred to in this study as the active source rock depth limit (ASDL). Beyond the ASDL, source rocks no longer generate or expel hydrocarbons and become inactive. Therefore, the ASDL also sets the maximum depth for fossil fuel resources. The ASDLs of basins around the world are found to range from 3000 to 16 000 m, while the thermal maturities (Ro) of source rocks at the ASDLs are almost the same, with Ro ≈3.5±0.5 %. The Ro of 3.5 % can be regarded as a general criterion to identify ASDLs. High heat flow and more oil-prone kerogen are associated with shallow ASDLs. In addition, tectonic uplift of source rocks can significantly affect ASDLs; 21.6 billion tons of reserves in six representative basins in China and 52 926 documented oil and gas reservoirs in 1186 basins around the world are all located above ASDLs, demonstrating the universal presence of ASDLs in petroliferous basins and their control on the vertical distribution of fossil fuel resources. The data used in this study are deposited in the repository of the PANGAEA database at: https://doi.org/10.1594/PANGAEA.900865 (Pang et al., 2019).

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Section: Characterization Of Asdlsmentioning

confidence: 99%

Section: Asdls In the Six Representative Basinsmentioning

confidence: 99%

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The dead line for oil and gas and implication for fossil resource prediction

Pang

Jia

Zhang

et al. 2020

Earth Syst. Sci. Data

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“…The source rocks original hydrocarbon generation potential of the source rocks was recovered by the material balance method (Pang et al, 2005). GPI (GPI ¼ 100 Â (S 1 þS 2 )/TOC) is a parameter used to express the hydrocarbon generation potential of source rocks, which could evaluate the hydrocarbon generation ability (Peng et al, 2016(Peng et al, , 2018. As shown in Figure 3, GPI o is the original hydrocarbon generation potential index, the remaining hydrocarbon generation potential index (GPI r ) is defined as the hydrocarbon generation potential of the source rocks after hydrocarbon has been expelled (Peng et al, 2016).…”

Section: Hydrocarbon Generation Potential Methodsmentioning

confidence: 99%

“…The hydrocarbon expulsion efficiency concurrently increases from 0 to 57.7% (average of 46.0%) ( Figure 7). The hydrocarbon generation potential curve of source rocks is a comprehensive reflection of the effects of different geological factors (Peng et al, 2016(Peng et al, , 2018. Based on source rocks' thickness, TOC, R o values, and the hydrocarbon generation and expulsion patterns, the hydrocarbon generation and expulsion intensities of the source rocks were calculated using equations (5) and (6), respectively.…”

Section: Hydrocarbon Generation and Expulsion Characterization Of Soumentioning

confidence: 99%

Hydrocarbon generation and expulsion of Middle Jurassic lacustrine source rocks in the Turpan–Hami Basin, NW China: Implications for tight oil accumulation

Yuan

Huang

et al. 2020

Energy Exploration & Exploitation

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In recent years, new oil reservoirs have been discovered in the middle Jurassic tight mixed rocks of the Turpan–Hami Basin. However, the generation potential of the J2q2 source rocks remains poorly understood. Petrographic, petrological, and geochemical analyses were carried out to assess the quality of the J2q2 source and reservoir rocks. The hydrocarbon generation potential method was utilized to evaluate the hydrocarbon generation and expulsion potentials. The results indicated that the rocks can be classified as high-quality source rocks with a relative lower degree of maturity. The hydrocarbon bearing zones are classified as tight reservoirs (average porosity of 5.90% and permeability of 0.18 mD) with an average pore throat radius >150 nm, which is higher than the cut-off pore-throat radius. The source rocks start to expel hydrocarbons when Ro% is 0.56%. Bulk hydrocarbon generation and expulsion intensities in the center of the study area were calculated with the values of 900 × 104 t/km2 and 400 × 104 t/km2, while the weights of these hydrocarbons were 48.8 × 108 t and 27.3 × 108 t, respectively. The tight oil reservoir-forming conditions are superior, and the hydrocarbon generation and expulsion intensities are more remarkable in controlling the tight oil distribution. This study provides an important example for the Jurassic source rocks in Western China, and indicates that middle Jurassic lacustrine source rocks deserve attention in future exploration.

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The hydrocarbon generation and expulsion features of source rocks and tight oil potential of the second member of the Qiketai Formation, Shengbei area in the Turpan–Hami Basin, NW China

et al. 2020

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Significant progress in tight oil exploration has been reported in the second member of the Qiketai Formation (J2q2) in the Shengbei area of the Turpan–Hami Basin. Geochemical analyses were conducted to assess the quality of the J2q2 source rocks. The improved hydrocarbon generation potential method was utilized to quantify the hydrocarbon generation and expulsion features of the source rocks. The results showed that J2q2 source rocks were deposited in a reduced lacustrine setting with a high palaeoproductivity. The J2q2 source rocks are widely distributed (approximately 1,000 km2) and have a thickness that varies from 50 to 130 m. Moreover, they can be identified as a set of high‐quality source rocks (thermally mature rocks with Ro values >0.5%, consisting mainly of types I and II kerogen and possessing an average total organic carbon content of 2.68%). The oil–source correlation results reveal that the source of crude oil in the studied area is J2q2. The improved hydrocarbon generation potential method is established for different kerogen types to limit the influence of the kerogen type on the calculation. The hydrocarbon expulsion threshold of the type I model is located at Ro = 0.6%. The type II kerogen rocks have different characteristics, and the hydrocarbon expulsion threshold is located at Ro = 0.62%. The maximum hydrocarbon generation and expulsion intensities are 700 × 104 t/km2 and 400 × 104 t/km2, respectively. The hydrocarbon generation and expulsion amount of the J2q2 source rocks are 21.4 × 108 t and 12.3 × 108 t, respectively. The tight oil potential of the J2q2 tight oil in the Shengbei area is 4.09 × 108 t. The SB10 and SB6 well areas are favourable J2q2 tight oil exploration areas in the Shengbei area. The SB10 well area has the highest hydrocarbon generation and expulsion intensities in the study area and is the best tight oil exploration target.

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Hydrocarbon-generation potential of upper Eocene Enping Formation mudstones in the Huilu area, northern Pearl River Mouth Basin, South China Sea

Cited by 15 publications

References 30 publications

The dead line for oil and gas and implication for fossil resource prediction

The dead line for oil and gas and implication for fossil resource prediction

Hydrocarbon generation and expulsion of Middle Jurassic lacustrine source rocks in the Turpan–Hami Basin, NW China: Implications for tight oil accumulation

The hydrocarbon generation and expulsion features of source rocks and tight oil potential of the second member of the Qiketai Formation, Shengbei area in the Turpan–Hami Basin, NW China

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