Facies analysis and depositional environment of a late Cambrian mixed carbonate-siliciclastic ramp from the Zard Kuh Mountain (Zagros Basin, south-western Iran)

Sorci, Andrea; Cirilli, Simonetta; Spina, Amalia; Ghorbani, Mansour; Rettori, R

doi:10.1016/j.sedgeo.2023.106370

Cited by 3 publications

(1 citation statement)

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“…By contrast, the mudstones in the upper member of Lingfeng Formation are marked by increased bioturbation, lighter color, and altered structure, indicating significant alterations in the paleoenvironment during its depositional period (Figure 10a). The rapid paleoenvironment (especially paleoclimatic changes) changes resulted in a greater input of terrigenous organic matter and the intensity of ocean currents, which further led to an increase the nutrition regionally [73][74][75]. The organic matter sources in the Lishui Sag exhibit a gradual increase in terrigenous sources, which is further evidenced by the biomarker parameters of the Pr/n-C 17 , Ph/n-C 18 , and the decreasing ∑C 21− /∑C 21+ ratios, as well as Carbon Preference Index (CPI) values (Figure 6 and Table S3).…”

Section: Gc and Gc-ms Analysis Resultsmentioning

confidence: 99%

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Zhan,

Liu,

Chen

et al. 2023

JMSE

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Investigating the paleoenvironment and characteristics of source rocks in sedimentary basins is crucial for understanding organic matter accumulation and guiding hydrocarbon exploration. The Lishui Sag, a significant hydrocarbon-bearing depression in the East China Sea, has experienced extensive marine transgression and increasing salinity in the Paleocene, but the changes in accumulation factors of organic matter during this evolution process remain unclear. Through a comprehensive analysis of total organic carbon (TOC), major and trace elements, and biomarker data, this study investigates the characteristics of source rocks from two lithostratigraphic units, namely the Paleocene Yueguifeng and Lingfeng formations, to gain deep insight into the effects of paleoenvironment on organic matter accumulation and hydrocarbon distribution. Our results indicate that the Lishui Sag transitioned from a closed lake to an open-marine environment in the Paleocene, with a shift from warm-humid to arid climate conditions. The biomarker distribution suggests a change in the origin of organic matter, with a higher input of terrestrial organic matter in the Lingfeng Formation. During the early stage, the lacustrine source rocks in the lower Yueguifeng Formation were formed in a relatively humid and anoxic environment within brackish water, resulting in a substantial influx of terrestrial and lacustrine algae organic matter. In contrast, in the late stage, the marine source rocks in the overlying Lingfeng Formation were developed in an arid and oxidizing environment. The lacustrine source rocks in the Yueguifeng Formation were notably more favorable to developing good-quality source rocks. Compared with the other regions, the western and northeastern parts of the study area have greater hydrocarbon generation potential due to the wider distribution of high maturity and organic-rich source rocks, with higher terrestrial and algal organic matter input. Moreover, considering the practical circumstances in the exploration, the northeastern part of the Lishui Sag is recommended as the next exploration target zone.

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Section: Gc and Gc-ms Analysis Resultsmentioning

confidence: 99%