scholarly journals Depositional environment of shales and enrichment of organic matters of the Lower Cambrian Niutitang Formation in the Upper Yangtze Region

2021 ◽  
Author(s):  
Xue Yang ◽  
Yue Lei ◽  
Jinchuan Zhang ◽  
Shijing Chen ◽  
Liqing Chen ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
Depositional Environment ◽  
Organic Matters ◽  
Niutitang Formation

The distribution characteristics of brittle minerals in the Lower Cambrian Niutitang Formation in northern Guizhou

2021 ◽  
Vol 86 ◽  
pp. 103752
Author(s):  
Wenjibin Sun ◽  
Yujun Zuo ◽  
Zhonghu Wu ◽  
Hao Liu ◽  
Lujing Zheng ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
Distribution Characteristics ◽  
Niutitang Formation

scholarly journals Reservoir characteristics and controlling factor of shale gas in Lower Cambrian Niutitang Formation, South China

2018 ◽  
Vol 3 (3) ◽  
pp. 210-220 ◽  
Author(s):  
Pengfei Wang ◽  
Zhenxue Jiang ◽  
Bo Han ◽  
Peng Lv ◽  
Can Jin ◽  
...  
Keyword(s):  
South China ◽  
Shale Gas ◽  
Lower Cambrian ◽  
Controlling Factor ◽  
Reservoir Characteristics ◽  
Niutitang Formation

The significance of the boundary between the Rhoscolyn and New Harbour formations on Holy Island, North Wales, to the deformation history of Anglesey

2012 ◽  
Vol 150 (3) ◽  
pp. 519-535 ◽  
Author(s):  
JACK E. TREAGUS ◽  
SUSAN H. TREAGUS ◽  
NIGEL H. WOODCOCK
Keyword(s):  
Lower Cambrian ◽  
Depositional Environment ◽  
High Strain ◽  
The Other ◽  
Deformation History ◽  
Two Phase ◽  
Phase Deformation ◽  
North Wales ◽  
History Of ◽  
Tectonic Features

AbstractThe boundary between the Rhoscolyn and New Harbour formations on Holy Island, Anglesey, has been described as a high strain zone or as a thrust. The boundary is here described at four localities, with reference to the contrasting sedimentary and deformational character of the two formations. At one of these localities, Borth Wen, sandstones and conglomerates at the top of the Rhoscolyn Formation are followed, without any break, by tuffs and then mudstones of the New Harbour Formation. It is concluded that there is clear evidence of depositional continuity across the boundary here, and that both formations subsequently shared a common two-phase deformation. The first (D1) was manifestly different in intensity and scale in the two formations, whereas the second (D2) produced very similar structures in both. The other three localities provide continuity of sedimentary and tectonic features at this boundary in a traverse along the length of Holy Island, leading us to identify two previously unrecognized major D1 folds in addition to the Rhoscolyn Anticline. At one of these localities (Holyhead), we confirm the presence of Skolithos just below the boundary, supporting radiometric evidence for a lower Cambrian or later age for the Rhoscolyn Formation. A turbidite interpretation for both the Rhoscolyn and New Harbour formations best fits the available evidence. A deep-water depositional environment is still compatible with the sporadic presence of Skolithos burrows, but less so with reported observations of hummocky and swaley cross-stratification lower down the South Stack Group.

Analysis of Developmental Characteristics and Dominant Factors of Pore-Fracture Systems in Lower Cambrian Marine Shale Reservoirs: A Case Study of the Niutitang Formation, Fenggang Block, Southern China

2021 ◽  
Vol 21 (1) ◽  
pp. 57-71
Author(s):  
Fu-Hua Shang ◽  
Yan-Ming Zhu ◽  
Hai-Tao Gao ◽  
Yang Wang ◽  
Rui-Yin Liu ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
Sichuan Basin ◽  
Distribution Area ◽  
Strong Positive Correlation ◽  
Longmaxi Formation ◽  
Positive Correlation ◽  
Fracture Systems ◽  
Fracture Development ◽  
The Sichuan Basin ◽  
Niutitang Formation

Due to breakthroughs in the Lower Silurian Longmaxi Formation in the Sichuan Basin and multiple strata around the basin, the northern part of Guizhou adjacent to the Sichuan Basin has become a key area for shale gas exploration. Compared with the Longmaxi Formation, the Niutitang Formation displays greater TOC (total organic carbon) content, depositional thickness and distribution area, but the details remain undetermined. In the study area, the Lower Cambrian Niutitang Formation typically has high TOC content, maturity and brittle mineral content. The study area has experienced multiple periods of tectonic movement, which have great influence on the fracture and pore characteristics. The fractures are mainly structural fractures and have obvious zoning. The primary types of pores are intraparticle pores, organic matter pores, and interparticle pores. Further, macropores and mesopores less than 50 nm contribute most of the pore volume, while pores less than 2 nm contribute most of the specific surface area. Many factors affect the pore-fracture system, such as tectonism, TOC content, mineral composition, and sedimentary environment. Tectonic movements produce fractures based on the changing stress field, but the degree of fracture development does not agree well with the degree of pore development. The TOC content has good positive correlations with the development of fractures and micropores, especially for nanoporosity, while clay minerals show a negative correlation with the development of fractures but a strong positive correlation with the growth of micropores. Quartz displays a positive correlation with the development of fractures but no good correlation with pore development. Finally, the lithofacies, lithologies and mineral compositions under the control of sedimentary environments are internal factors that can impact the development of pore-fracture systems.

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