scholarly journals Investigation on the biodegradation levels of super heavy oils by parameter-striping method and refined Manco scale: a case study from the Chepaizi Uplift of Junggar Basin

2021 ◽  
Author(s):  
Xiang-Chun Chang ◽  
Bing-Bing Shi ◽  
Zhong-Quan Liu ◽  
Yue Wang ◽  
You-De Xu
Keyword(s):  
Refractory Compound ◽  
Junggar Basin ◽  
Heavy Oils ◽  
Volcanic Reservoir ◽  
Stripping Method ◽  
Magnitude Variation ◽  
Absolute Concentrations ◽  
Oil Density ◽  
Tricyclic Terpanes

AbstractThe Carboniferous volcanic reservoir in the Chepaizi Uplift became an exploration hot target in recent years for its substantial amount of oils discovered. However, most of the Carboniferous heavy oils were biodegraded to PM7 or higher with orders of magnitude variation in oil viscosities. Two oil groups (I and II) exactly corresponding to the western and eastern Chepaizi Uplift were distinguished according to their source diagnose. Furthermore, three oil families (II1, II2 and II3), with the biodegradation level of PM7, PM8–8+, PM9+, respectively, were classified based on molecular compositions and parameter-stripping method of strongly bioresistant parameters. Allowing for this extremely high biodegradation case, more biodegradation refractory compound class were added to establish a refined Manco scale to quantitatively evaluate the biodegradation extent. Refined Manco number (RMN2) positively correlated with the oil density, NSO contents, and absolute concentrations of diasteranes and gammacerane, negatively correlated with the absolute concentrations of diahopane, summed tricyclic terpanes and pentacyclic terpanes. This refined scale showed higher resolution than the PM one to differentiate the biodegradation extent of Carboniferous heavy oils from the Chepaizi Uplift, especially those with same PM values but different oil viscosities.

Characteristics of Diagenesis and Pore Evolution of Volcanic Reservoir: A Case Study of Junggar Basin, Northwest China

2021 ◽  
Vol 32 (4) ◽  
pp. 960-971
Author(s):  
Zhiguo Mao ◽  
Rukai Zhu ◽  
Jinghong Wang ◽  
Jinglan Luo ◽  
Ling Su
Keyword(s):  
Junggar Basin ◽  
Northwest China ◽  
Volcanic Reservoir ◽  
Pore Evolution

scholarly journals Geochemistry of severely biodegraded oils in the Carboniferous volcanic reservoir of the Chepaizi Uplift, Junggar Basin, NW China

2018 ◽  
Vol 36 (6) ◽  
pp. 1461-1481 ◽  
Author(s):  
Youde Xu ◽  
Xiangchun Chang ◽  
Bingbing Shi ◽  
Yue Wang ◽  
Yang Li
Keyword(s):  
Stable Carbon Isotopes ◽  
Selective Reduction ◽  
Junggar Basin ◽  
Source Rocks ◽  
Volcanic Reservoir ◽  
Oil Generation ◽  
Biodegraded Oils ◽  
Hypersaline Condition ◽  
Geochemical Investigation ◽  
Tricyclic Terpanes

A substantial amount of petroleum was recently discovered in the Carboniferous volcanic reservoir of the Chepaizi Uplift in the western Junggar Basin, yet the source is still indefinitive. Geochemical investigation indicates that the Carboniferous oils from the eastern and western Chepaizi Uplift are characterized by different source facies, although they are all typically of lacustrine origin. The eastern oils exhibit a restricted, clastic starved, highly reducing hypersaline condition during source rock deposition, which is distinct from the western oils. The Carboniferous oils were subjected to biodegradation ranging from rank 6 to rank 9, as indicated by the presence of 25-norhopane, evident depletion of hopanes and regular steranes, and even selective reduction of tricyclic terpanes. The maturities for the Carboniferous oils correspond to the onset of oil generation. The eastern oils contain lower (C19 + C20)TT/(C23 + C24)TT and C19TT/C21TT, and lighter stable carbon isotopes than the western ones, correlating well with the Middle Permian Wuerhe (P2w) source rocks and the Jurassic source rocks, respectively. The good correlation of tricyclic terpanes source-related parameters further implies less contribution to the eastern oils by the Carboniferous source rocks.

scholarly journals Fractures in Volcanic Reservoir: a case study of Zhongguai uplift in Northwestern Margin of Junggar Basin, China

2018 ◽  
Vol 22 (3) ◽  
pp. 169-174 ◽  
Author(s):  
Cunhui Fan ◽  
Qirong Qin ◽  
Feng Liang ◽  
Zenghui Fan ◽  
Zhi Li
Keyword(s):  
Oil And Gas ◽  
Volcanic Rocks ◽  
Junggar Basin ◽  
Pressure Change ◽  
Reservoir Permeability ◽  
Northwestern Margin ◽  
Genetic Mechanisms ◽  
Relationship Of ◽  
Oilfield Development

Fractures in Carboniferous volcanic rocks located at Zhongguai Area (China) highly influence the accumulation and productivity of oil and gas. As such, the study of development periods and genetic mechanisms of tectonic fractures could throw useful information regarding the evaluation and development of that reservoir. Their tectonic origins caused high-angle and oblique shear fractures. The primary orientation of those fractures appears close to EW (270°±10°), NW (300°±15°), NE (45°±15°), and SN (0°±10°). At least four fracture generations can be found in Carboniferous volcanic rocks at Zhongguai Area. Combined with a tectonic evolution, they are based on the segmentation relationship of the fracture fillings, the thermometry measurement of the fracture filling inclusion, and the acoustic emission, as well. Affected by a new horizontal principal stress, the opening and permeability of nearly EW fractures are the best. In this way, a priority in the development of well's patterns should be considered close to EW fractures. The pressure change in the process of exploitation may damage the reservoir permeability of fractured volcano rocks severely. Accordingly, well patterns should be adjusted to dynamic changes of permeability happened during the oilfield development since some differences have been detected in distinct fracture sets. 

scholarly journals Study on Field-scale of CO2 Geological Storage Combined with Saline Water Recovery: A Case Study of East Junggar Basin of Xinjiang

2018 ◽  
Vol 154 ◽  
pp. 36-41 ◽  
Author(s):  
Xin Ma ◽  
Xufeng Li ◽  
Guodong Yang ◽  
Wang Huang ◽  
Yujie Diao ◽  
...  
Keyword(s):  
Saline Water ◽  
Junggar Basin ◽  
Water Recovery ◽  
Geological Storage ◽  
Co2 Geological Storage ◽  
Field Scale
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