Preliminary study on the effects of Permian volcanism on the Tahe Ordovician oil pools in Tarim basin

Pu, Renhai; Zhong, Hongli; Zhang, Yun-Long

doi:10.1016/j.marpetgeo.2013.03.003

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…The most extensive basalt eruptions and igneous emplacements took place during the Permian as a result of southward convergent subduction of the Middle Tianshan arc to the north. ,, The volcanic rocks are either basalt to dacite sequences or dacite deposition . A 94 m thick black diabase intrusion occurred in the Silurian oil sands at a depth of 4615–4709 m in well TZ18 at the Tazhong Uplift, whereas up to 200 m basalt and dacite were encountered in the Ordovician in the midwestern part of the Tabei Uplift . The Keping uplift has also suffered extensive magmatic emplacement and volcanic eruption in the early Permian .…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The Tarim Basin is a large complex sedimentary basin that experienced multiphase tectonic activities. Permian igneous rocks are widely distributed and occur throughout the basin. − An igneous intrusion of 94 m thick has been discovered intruding into the Silurian sandstone in well TZ18 at the Tazhong Uplift. Petroleum, in this case, was altered into black carbonaceous bitumen due to abnormally high heat stress .…”

Section: Introductionmentioning

confidence: 99%

“…Up to 200 m basalt and dacite has been detected in the Ordovician reservoir at west of Tahe oilfield in the Tabei Uplift. Violent and uneven volcanic activities were probably what caused oils to become heavy and viscous because of different thermal evaporation intensity . Therefore, the Tarim Basin is a good region to investigate such processes.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolytically Derived Polycyclic Aromatic Hydrocarbons in Marine Oils from the Tarim Basin, NW China

2015

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Polycyclic aromatic hydrocarbons (PAHs) in oils from the cratonic region of the Tarim Basin have been characterized by gas chromatography−mass spectroscopy to investigate their origins and geochemical applications. PAHs dominated by unsubstituted components together with pyrolytically derived components such as anthracene, fluoranthene, benzoanthracene, benzofluoranthenes and benzopyrenes occur in some oils represented by those from well TD2. The widespread spatial and temporal occurrence of igneous activity within the Palaeozoic succession in the Tarim Basin makes the derivation of the latter PAHs from pyrolytic sources probable. Exposure to high temperatures results in the pyrolysis of the oil reservoir, adding high-temperature aromatic artifacts to the oil. Geochemical measurements show the wide occurrence of mixing processes between pyrolytically derived PAHs and diagenetically derived hydrocarbons. Good preservation of pyrolytic PAHs in oils from well TD2 and a few other wells is because they are less affected by late charge and dilution processes. However, these pyrolytically derived PAHs in conjunction with the bulk carbon isotopic compositions have been commonly misinterpreted in oil-source correlations. Only oils from well TD2 and a few other wells have been correlated to the Cambrian source rocks because of the wrong selection of end members. When the effects from the rapid heating of organic material by magmatic intrusions and/or hydrothermal fluid activity are properly accounted for, confusion in oil-source correlations may potentially be resolved and the contribution from the Cambrian strata can appropriately be assessed.

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyrolytically Derived Polycyclic Aromatic Hydrocarbons in Marine Oils from the Tarim Basin, NW China

2015

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“…In recent years, the exploration of volcanic rocks has received more and more attention (M. Li, Zou, & Liu, ; Pu, Zhong, & Zhang, ; Yang, Zhang, Liu, Wen, & Xu, ; C. Zhang, Shi, & Wu, ; Zhu, ; Zou et al, ). For identification of volcanic cones or volcanic rocks, previous research on this subject (Y. Li, He, & Liu, ) mainly used the seismic facies characteristic (Y. Feng et al, ; Qin, Wei, & Zhang, ; Yu, ), seismic attribute analysis (J. Wu et al, ; Zhu, ), coherent analysis (Guo et al, ), and other methods (Alvarenga, Iacopini, Kuchle, Scherer, & Goldberg, ; Z. Q. Feng, ; Malehmir & Bellefleur, ).…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the exploration of volcanic rocks has received more and more attention (M. Li, Zou, & Liu, 2002;Pu, Zhong, & Zhang, 2013;Yang, Zhang, Liu, Wen, & Xu, 2006;C. Zhang, Shi, & Wu, 2005;Zhu, 2013;Zou et al, 2008).…”

mentioning

confidence: 99%

Identification method and distribution of palaeovolcanoes in Mulei Depression in the Junggar Basin, Western China

2019

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case of minimal well information available, we identify the volcanoes of the Upper Carboniferous Bashan Formation of the Mulei Depression and clarify its distribution characteristics. Through frequency decomposition and a reconstruction of seismic data, the seismic reflection characteristics of the ancient volcanic cone become prominent and easy to identify, and even the period of some stacked volcanic cones can be divided. According to the geological model put forward, the seismic reflection characteristics of the ancient volcanic cone and its surrounding volcanic rocks are clarified. The volcanic cones are characterized by mound-clutter and weak-blank amplitude reflection. The internal clutter mainly have resulted from rapid changes in lithology and complex secondary faults. Away from the crater direction, the energy of a seismic event is gradually enhanced, and the volcanic sediments from other sources will be superimposed above the previously formed volcanoes. It is found that the volcanic channel with a short-axis continuous illusion is often developed at the bottom. The volcanic channel which can be identified in seismic mainly affects the development of large volcanoes. Finally, 27 volcanic cones and seven volcanic channels were identified via establishing the threedimensional (3D) model of the volcano and the amplitude of the root mean square of seismic data after reconstruction, as well as interpreting deep faults. The volcanic development in the Mulei Depression has the characteristics of an NE spread along deep faults and northern more than southern.

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Characteristics and origins of middle Miocene mounds and channels in the northern South China Sea

Zhang²,

et al. 2021

Acta Oceanol. Sin.

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Preliminary study on the effects of Permian volcanism on the Tahe Ordovician oil pools in Tarim basin

Cited by 7 publications

References 9 publications

Pyrolytically Derived Polycyclic Aromatic Hydrocarbons in Marine Oils from the Tarim Basin, NW China

Pyrolytically Derived Polycyclic Aromatic Hydrocarbons in Marine Oils from the Tarim Basin, NW China

Identification method and distribution of palaeovolcanoes in Mulei Depression in the Junggar Basin, Western China

Characteristics and origins of middle Miocene mounds and channels in the northern South China Sea

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