scholarly journals The influence factors of gas-bearing and geological characteristics of Niutitang Formation shale in the southern margin of Xuefeng Mountain ancient uplift: A case of Well Huangdi 1

China Geology ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 533-544
Author(s):  
Ming-na Ge ◽  
◽  
Ke Chen ◽  
Xiang-lin Chen ◽  
Chao Wang ◽  
...  
Keyword(s):  
Influence Factors ◽  
Geological Characteristics ◽  
Southern Margin ◽  
Niutitang Formation ◽  
Gas Bearing

Critical geological characteristics and gas-bearing controlling factors in Longmaxi shales in southeastern Chongqing, China

2016 ◽  
Vol 34 (1) ◽  
pp. 42-60 ◽  
Author(s):  
Tieya Jing ◽  
Jinchuan Zhang ◽  
Shisen Xu ◽  
Zhujiang Liu ◽  
Shuangbiao Han
Keyword(s):  
Controlling Factors ◽  
Geological Characteristics ◽  
Gas Bearing

The Siluro-Devonian evolution of the southern Midland Valley of Scotland

1995 ◽  
Vol 132 (5) ◽  
pp. 503-513 ◽  
Author(s):  
R. A. Smith
Keyword(s):  
Marked Change ◽  
Sedimentary Facies ◽  
Strike Slip ◽  
Slip Model ◽  
Calc Alkaline ◽  
Red Sandstone ◽  
Geological Characteristics ◽  
Southern Margin ◽  
Magmatic Event ◽  
Southern Upland

AbstractGeological studies along the southern margin of the Midland Valley of Scotland, together with previously published work, suggest a strike-slip model for its evolution during Silurian and Devonian times. The data emphasize the ‘older Caledonian’ influence and persistent, albeit intermittent, transcurrent activity along the Southern Upland Fault which is the boundary between the Midland Valley and Southern Upland terranes. A comparison of the geological characteristics of the Silurian and Devonian rocks in the southern Midland Valley with characteristics from strike-slip basins elsewhere suggests that the Midland Valley rocks were deposited and locally deformed under sinistral strike-slip regimes with two main episodes of transtension — the first acting in Llandovery—Wenlock times and the second in Lower Old Red Sandstone times. A strike-slip model involving transpression may explain why there is a strong unconformity between the Llandovery—Wenlock and the Lower Old Red Sandstone strata in the Pentland Hills and Girvan inliers but only a marked change in sedimentary facies at the equivalent horizon in the inliers of the central Midland Valley. The Lower Old Red Sandstone was probably deposited in a transtensional regime, but the succession is complicated by the widespread Lower Old Red Sandstone calc-alkaline magmatic event. The mid- Devonian deformation is also variable in its effects and the more easterly trend of theen echelonfold axes relative to the Southern Upland Fault trend is indicative of sinistral transpression. Carboniferous and older rocks were affected by smaller dextral movements on the Southern Upland Fault and related faults which started during Namurian times when a change to an overall dextral regime took place.

scholarly journals Integrated Assessment of Marine-Continental Transitional Facies Shale Gas of the Carboniferous Benxi Formation in the Eastern Ordos Basin

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8500
Author(s):  
Weibo Zhao ◽  
Zhigang Wen ◽  
Hui Zhang ◽  
Chenjun Wu ◽  
Yan Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Shale Gas ◽  
Ordos Basin ◽  
Gas Content ◽  
Organic Carbon Content ◽  
Geological Characteristics ◽  
Core Samples ◽  
The Ordos Basin ◽  
Gas Bearing ◽  
Benxi Formation

In the Benxi Formation of the Carboniferous system of the Upper Paleozoic in the Ordos Basin, there are many sets of coal measures dark organic-rich shale, being marine continental transitional facies, with significant unconventional natural gas potential. Previous studies are only limited to the evaluation of tight sandstone reservoir in this set of strata, with no sufficient study on gas bearing and geological characteristics of organic-rich shale, restricting the exploration and evaluation of shale gas resources. In this study, analysis has been conducted on the organic carbon content, the major elements, the trace elements, and the mineral composition of core samples from the Benxi Formation in key drilling sections. In addition, qualitative and quantitative pore observation and characterization of core samples have been conducted. The sedimentary environments and reservoir characteristics of the shale of the Benxi Formation have been analyzed. Combined with the gas content analyzing the results of the field coring samples, the shale gas resource potentials of the Benxi Formation have been studied, and the geological characteristics of the Benxi Formation shale gas in the eastern Ordos Basin have been made clear, to provide a theoretical basis for shale gas resource evaluation of the Benxi Formation in the Ordos Basin. The results show that (1) in the Hutian Member, Pangou Member, and Jinci Member of the Benxi Formation, organic-rich shale is well developed, with the characteristics of seawater input as a whole. There is a slight difference in sedimentary redox index, which shows that the reducibility increases gradually from bottom to top. (2) There is an evident difference in the mineral characteristics of shale in these three members. The Hutian Member is rich in clay minerals, while the Jinci Member is high in quartz minerals. (3) The pores are mainly inorganic mineral intergranular pores, clay interlayer fractures, and micro fractures, and organic matter pores are developed on the surface of local organic matter. (4) The mud shale in the Jinci Member has a large cumulative thickness, has relatively high gas-bearing property, and is rich in brittle minerals. The Jinci Member is a favorable section for shale gas exploration of the Benxi Formation.

Analysis on Scale and Geological Characteristics-Based Influence Factors in Land Creep

2021 ◽  
Vol 55 (5) ◽  
pp. 37-51
Author(s):  
Jae-Hyeon Park ◽  
◽  
Seong-Gyun Park ◽  
Min-Jeng Kang ◽  
Hong-Geun Lim
Keyword(s):  
Influence Factors ◽  
Geological Characteristics
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