Geochemical Characteristics and Origin of Crude Oil and Natural Gas in the Southern Slope Zone, Kuqa Foreland Basin, NW China

Liu, Chun; Chen, Shijia; Jing, Zhao; Zhou, Shunhua; Hui, Rutai

doi:10.1007/s12583-021-1412-4

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…The eastern Kuqa Depression mainly includes the middle-eastern section of the Northern tectonic belt, the Yangxia sag and its surrounding areas, with an area of 7000 km 2 , which can be further subdivided into four zones, namely, the northern slope zone (NSZ), the central anticline zone (CAZ), the southern slope zone (SSZ), and the deep sag zone (DSZ) from north to south [17] (Figure 1c). Affected by Yanshan (during the Late Jurassic to the Early Cretaceous) and Late Himalayan (in the Neogene) orogenic movements, the Kuqa Depression has experienced intensive lateral extrusion, especially in the mountain front, forming several large thrust belts (e.g., the Yiqikelike and Tugerming thrust belts) [18,19].…”

Section: Geological Settingmentioning

confidence: 99%

Hydrocarbon Generation and Accumulation in the Eastern Kuqa Depression, Northwestern China: Insights from Basin and Petroleum System Modeling

Jia,

Yuan,

Liu

et al. 2024

Applied Sciences

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The eastern Kuqa Depression in the northern Tarim Basin, NW China, is rich in oil and gas. However, recent exploration has been hindered by a lack of knowledge on the evolution of the petroleum system. To address this, we conducted hydrocarbon generation and accumulation modeling using both the 2Dmove and PetroMod2017 software for a complex tectonic extrusion section in the Kuqa Depression. The results show that the source rocks in the northern slope zone became mature quite early at around 170 Ma, but the thermal maturity evolution stagnated subsequently because of tectonic extrusion and uplift. The source rocks in the central anticline zone, the southern slope zone, and the deep sag zone were of overall low maturity during the Jurassic to Paleogene but rapidly became mature to highly mature with the deposition of the Neogene Jidike and Kangcun formations. The main hydrocarbon generation periods are in the late Neogene and Quaternary, and the main hydrocarbon generation stratum is the lower Jurassic Yangxia formation. The amount of cumulative hydrocarbon generation gradually increases for carbonaceous mudstone, mudstone, and coal source rocks. Sourced from source rocks mainly in the northern slope zone, oil and gas migrated to anticlinal traps along sandstone transport layers and faults. Recent discoveries, such as the Tudong-2 gas field in the central anticline zone, underscore the richness of this region in petroleum resources. Some gas fields were also predicted in lithologic traps in the southern slope zone and the deep sag zone, as well as in fault-related traps in the northern part of the northern slope zone.

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Section: Geological Settingmentioning

confidence: 99%

Hydrocarbon Generation and Accumulation in the Eastern Kuqa Depression, Northwestern China: Insights from Basin and Petroleum System Modeling

Jia,

Yuan,

Liu

et al. 2024

Applied Sciences

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“…The rare earth elements can indicate the provenance and diagenetic environment [39][40], and have strong metallicity. The Eu and Ce anomalies can be used to indicate the oxidation reduction conditions in the ancient environment [41][42]. Meanwhile, the positive and negative anomalies of Eu can be used to indicate whether there is volcanic hydrothermal solution involved [43][44].…”

Section: Rare Earth Elementsmentioning

confidence: 99%

Geochemical characteristics and genesis of Middle Proterozoic Jixian System dolomite in the Southwest margin of Ordos Basin

Liu

Zhang²,

Liang

et al. 2023

Preprint

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Shallow marine dolomite of Jixian System in Qishan area of Ordos Basin is of great significance for deep exploration of the basin, but its genetic mechanism is still unclear. On the basis of field sampling, by means of analysis and testing of major and trace elements, C, O isotopes, Sr isotopes, combined with the evolutionary background of Middle Proterozoic, this paper has analyzed the geochemical characteristics of Jixian dolomite in Qishan area, and further discussed the origin of dolomite. This study shows that the Jixian dolomite in Qishan area is mainly composed of dolomite, siliceous dolomite and chert bearing banded dolomite, and stromatolites are relatively developed; Geochemical characteristics show that the diagenetic fluid of dolomite in the study area mainly comes from marine sediments, and fresh water may be added later; The genesis of crystalline dolomite is mainly burial genetic model, while the residual texture dolomite and calcareous dolomite are mixed water genetic model; Dissolution dolomite is the cause of seepage reflux mode.

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“…For instance, short-chain n-alkanes are predominantly related to aquatic sources (e.g., microphytoplankton), while abundant long-chain n-alkanes indicates extensive input of terrestrial organic carbon [29]. The values of Pristane (Pr) and Phytane (Ph) are widely used to indicate redox conditions [30][31][32].…”

Section: Introductionmentioning

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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Geochemical Characteristics and Origin of Crude Oil and Natural Gas in the Southern Slope Zone, Kuqa Foreland Basin, NW China

Cited by 6 publications

References 19 publications

Hydrocarbon Generation and Accumulation in the Eastern Kuqa Depression, Northwestern China: Insights from Basin and Petroleum System Modeling

Hydrocarbon Generation and Accumulation in the Eastern Kuqa Depression, Northwestern China: Insights from Basin and Petroleum System Modeling

Geochemical characteristics and genesis of Middle Proterozoic Jixian System dolomite in the Southwest margin of Ordos Basin

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

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