Discovery and basic characteristics of high-quality source rocks found in the Yuertusi Formation of the Cambrian in Tarim Basin, China

Zhu, Guangyou; Chen, Feiran; Chen, Zhiyong; Zhang, Ying; Xing, Xiang; Tao, Xiaowan; Ma, Debo

doi:10.1016/j.jnggs.2016.05.002

Cited by 44 publications

(40 citation statements)

References 21 publications

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“…The distribution of source rocks is an important factor affecting exploration in the Tarim Basin. Currently, researchers generally believe that the Lower Cambrian Yuertus Formation is a set of source rocks (Zhu et al, 2014(Zhu et al, , 2016Tao et al, 2016;Chen et al, 2017;. The source rock of the Cambrian Yuertus Formation provided material for oil and gas accumulation in deep formations of the Tarim Basin.…”

Section: Controlling Effect Of Nanhua-sinian Rifts On Hydrocarbon Accmentioning

confidence: 99%

Distribution Features of the Nanhua‐Sinian Rifts and their Significance to Hydrocarbon Accumulation in the Tarim Basin

Bai¹,

Cheng²,

Cheng

et al. 2020

Acta Geologica Sinica (Eng)

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On the basis of reprocessing 34 new two‐dimensional spliced long sections (20,191 km) in the Tarim Basin, the deep structure features of the Tarim Basin were analyzed through interpreting 30,451 km of two‐dimensional seismic data and compiling basic maps. Seismic interpretation and geological analysis conclude that the Nanhua‐Sinian strata are a set of rift‐depression depositional systems according to their tectonic and depositional features. The rift valley formed in the Nanhua Period, and the transformation became weaker during the late Sinian Period, which eventually turned into depression. From bottom to top, the deposited strata include mafic igneous, tillite, mudstone, and dolomite. Three major depocenters developed inside this basin during the rift stage and are distributed in the eastern Tarim Basin, the Awati area, and the southwestern Tarim Basin. Among them, the rift in the eastern Tarim Basin strikes in the near east‐west direction on the plane and coincides with the aeromagnetic anomaly belt. This represents a strong magnetic zone formed by upwelling basic volcanic rock along high, steep normal faults of the Nanhua Period. Controlled by the tectonic background, two types of sedimentary systems were developed in the rift stage and depression stage, showing two types of sequence features in the Sinian depositional stage. The Nanhua System appears as a wedge‐shaped formation, with its bottom in unconformable contact with the base. The rifting event has a strong influence on the current tectonic units in the Tarim Basin, and affects the distribution of source rock in the Yuertus Formation and reservoir beds in the Xiaoerbulake Formation in Lower Cambrian, as well as the gypseous cap rock in Middle Cambrian. The distribution features of the rifts have important and realistic significance for determining the direction of oil and gas exploration in the deep strata of the Tarim Basin. Comprehensive analysis suggests that the Tazhong region is the most favorable zone, and the Kalpin‐Bachu region is the optimal potential zone for exploring sub‐salt oil and gas in deep Cambrian strata.

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Section: Controlling Effect Of Nanhua-sinian Rifts On Hydrocarbon Accmentioning

confidence: 99%

Distribution Features of the Nanhua‐Sinian Rifts and their Significance to Hydrocarbon Accumulation in the Tarim Basin

Bai¹,

Cheng²,

Cheng

et al. 2020

Acta Geologica Sinica (Eng)

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“…The results shows that Cambrian Yuertus Formation developed highquality hydrocarbon source rocks with high organic matter abundance, which organic carbon content of black shale could be as high as 4 to 16%, stably distributing in the Aksu area and the thickness of mainly 10~15 m, and thought to be deposited in the middle to lower gentle slope environment, in which the enrichment of organic matter is controlled by rising ocean currents [7].…”

Section: Discovery Of Yuertus Source Rocksmentioning

confidence: 97%

“…Recently it is thought to be the marine high-quality hydrocarbon source rocks with the highest TOC [7], and considered as one of the main hydrocarbon source rocks in Tarim Basin [8]. However, only XH1 well in the basin area drilled Yuertus Formation which was over 20m, the other 20 wells that drilled through Cambrian For example, H4 and F1 wells in Bachu area drilled Yuertus Formation, however, with lithology of brown siliceous mudstone and shale respectively, and the organic carbon content mainly less than 0.5%, which does not have the production ability of oil and gas; in addition, Manxi platform that possibly developed source rocks of Yuertus Formation could be difficult to predicting the distribution of Yuertus Formation only with seismic data due to the high burial depth.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Main Controlling Factors of Source Rock in Cambrian Yuertus Formation in Aksu Area, Tarim Basin

Chen¹,

Xing²,

Zhang³

et al. 2017

IJEE

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“…Additionally, being the largest petroliferous basin in northwest (NW) China, the lower Cambrian source rock was a focus of scientific debate [17,18,[26][27][28]. In recent years, the results of oil and source rock correlation and the exploration discovery of primary oil and gas in the Cambrian subsalt dolomite reservoirs have shown that the lower Cambrian Yurtusi Formation is the most important source rocks in Tarim Basin [26,29]. However, there are few stratigraphic data about the lower Cambrian source rock.…”

Section: Introductionmentioning

confidence: 99%

“…Due to its small thickness and the deep burial, it is difficult to identify and trace the seismic horizons corresponding with the lower Cambrian source rocks on the seismic sections. Therefore, there are a lot of controversies over the distribution of the lower Cambrian source rocks, especially in the western sectors of the Tarim Basin [17,18,[26][27][28]. These issues directly affect the evaluation and the selection of the target areas of deep oil and gas exploration.…”

Section: Introductionmentioning

confidence: 99%

Late Neo-Proterozoic Tectono-Sedimentary Evolution of the Tarim Block, NW China

Shi¹,

Liu²,

Jiang³

et al. 2021

Geochemistry

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The study of the late Neo-Proterozoic tectono-sedimentary evolution of the Tarim Basin is a key to unravel the tectonic setting, the intracontinental rift formation mechanism, and the sedimentary filling processes of this basin. Since in the Tarim Basin, the late Neo-Proterozoic to early Cambrian sedimentary successions were preserved, this basin represents an excellent site in order to study the Precambrian geology. Based on the outcrop data collected in the peripheral areas of the Tarim Basin, coupled with the intra-basinal drill sites and seismic data previously published, the late Neo-proterozoic tectono-sedimentary evolution of the Tarim Basin has been investigated. These data show that there were two individual blocks before the Cryogenian Period, namely, the north Tarim Block and the south Tarim Block. In the early Neo-Proterozoic (ca. 800 Ma), the amalgamation of two blocks resulted in the formation of the unified basement. During the late Neo-Proterozoic, the Tarim Block was in an extensional setting as a result of the Rodinia supercontinent breakup and then evolved into an intracontinental rift basin. The tectono-sedimentary evolution of the basin may be divided into three stages: the rifting stage (780-700 Ma), the rifting to depression transitional stage (660-600 Ma), and the post-rift depression stage (580-540 Ma). In the rifting stage, intracontinental rifts (i.e., the Awati Rift, the North Manjar Rift, and the South Manjar Rift) were formed, in which coarse-grained clastic sediments were deposited, generally accompanied by a massive volcanic activity due to an intensive stretching. In the rifting-depression transitional stage and in the post-rift depression stage, the paleogeography was characterized by uplifts to the south and depressions to the north. Three types of depositional association (i.e., clastic depositional association, clastic-carbonate mixed depositional association, and carbonate depositional association) were formed. The distribution of the lower Cambrian source rock was genetically related to the tectono-sedimentary evolution during the late Neo-Proterozoic. The lower Cambrian source rock was a stable deposit in the northern Tarim Basin, where the late Ediacaran carbonate was deposited, thinning out toward the central uplift. It was distributed throughout the entire Mangar region in the east and may be missing in the Magaiti and the southwestern Tarim Basin.

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Discovery and basic characteristics of high-quality source rocks found in the Yuertusi Formation of the Cambrian in Tarim Basin, China

Cited by 44 publications

References 21 publications

Distribution Features of the Nanhua‐Sinian Rifts and their Significance to Hydrocarbon Accumulation in the Tarim Basin

Distribution Features of the Nanhua‐Sinian Rifts and their Significance to Hydrocarbon Accumulation in the Tarim Basin

Characteristics and Main Controlling Factors of Source Rock in Cambrian Yuertus Formation in Aksu Area, Tarim Basin

Late Neo-Proterozoic Tectono-Sedimentary Evolution of the Tarim Block, NW China

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