Geochemical Characteristics and Logging Quantitative Prediction Model Establishment of Source Rocks in Saline Lake Basin—Take the Paleogene of Qaidam Basin as an Example

2020 ◽  
pp. 2372-2381
Author(s):  
Ying-chun Gou ◽  
Yan-li Li ◽  
Jian-gong Wang ◽  
Ya-jun Shi ◽  
Song-ling Sun
Keyword(s):  
Prediction Model ◽  
Saline Lake ◽  
Qaidam Basin ◽  
Geochemical Characteristics ◽  
Source Rocks ◽  
Quantitative Prediction ◽  
Lake Basin

scholarly journals Petrologic and geochemical characteristics of high-quality saline lacustrine source rocks in western Qaidam Basin

2018 ◽  
Vol 3 (4) ◽  
pp. 359-369
Author(s):  
Bin Zhang ◽  
Yuanyuan He ◽  
Yan Chen ◽  
Qingyang Meng ◽  
Jiaxuan Huang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Geochemical Characteristics ◽  
Source Rocks ◽  
High Quality ◽  
Western Qaidam Basin ◽  
Saline Lacustrine

Genesis of hydrogen sulfide in natural gas reservoirs in Western Qaidam Basin

2020 ◽  
pp. 1-31
Author(s):  
Tian Jixian ◽  
Jian Li ◽  
Hua Kong ◽  
Xu Zeng ◽  
Xiaobo Wang ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Natural Gas ◽  
Qaidam Basin ◽  
Source Rocks ◽  
Mature Stage ◽  
Lake Basin ◽  
Large Area ◽  
Gas Reservoirs ◽  
Western Qaidam Basin ◽  
Natural Gas Reservoirs

In recent years, gas reservoirs containing high levels of hydrogen sulfide have been found in salinized lacustrine carbonate rocks in the upper member of the Lower Ganchaigou Formation (E32) in the Yingxiongling area of the western Qaidam Basin. This poses great safety risks to drilling and development. To clarify the genetic mechanisms of hydrogen sulfide, we analyzed thegeochemical characteristics and sulfur isotopes of natural gas, and predicted the distribution of hydrogen sulfide. The results show that: (1) Natural gas in the Yingxiongling area is dominated by wet gas, with relatively high non-hydrocarbon content. The gas is E32 oil-type gas in a mature stage. (2) Hydrogen sulfide in natural gas reservoirs is less likely to originate from biological and volcanic geneses, and is primarily a product of thermochemical sulfate reduction (TSR). The high-quality Oligocene source rocks distributed across a large area, the saline-deposit formations widely distributed in the western Qaidam Basin, and the high geothermal gradients and large numbers of developed pore-type reservoirs, all combine to provide favorable conditions for the formation of hydrogen sulfide reservoirs. (3) During the E32 deposition period, rock salt developed in the center of the lake basin, the sealing conditions for oil and gas were favorable, and the formation temperature was high during the reservoir formation period. Development of sub-salt porous reservoirs is conducive to enrichment of hydrogen sulfide, and comprehensive prediction indicates that the sub-salt formation in the Central Yingxiongling-Gancaigou area is an enrichment zone for hydrogen sulfide. The research results are of considerable significance for the exploration and deployment, and the production safety, of hydrogen sulfide-containing reservoirs.

scholarly journals Low Temperature Illitization through Illite-Dioctahedral Vermiculite Mixed Layers in a Tropical Saline Lake Rich in Hydrothermal Fluids (Sochagota Lake, Colombia)

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 523
Author(s):  
Gabriel Ricardo Cifuentes ◽  
Juan Jiménez-Millán ◽  
Claudia Patricia Quevedo ◽  
Fernando Nieto ◽  
Javier Cuadros ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Organic Matter ◽  
Low Temperature ◽  
High Salinity ◽  
Source Rocks ◽  
Temperate Climate ◽  
Lake Basin ◽  
X Ray ◽  
Saline Waters ◽  
Mixed Layers

In this investigation, we showed that high salinity promoted by hydrothermal inputs, reducing conditions of sediments with high content in organic matter, and the occurrence of an appropriate clay mineral precursor provide a suitable framework for low-temperature illitization processes. We studied the sedimentary illitization process that occurs in carbonaceous sediments from a lake with saline waters (Sochagota Lake, Colombia) located at a tropical latitude. Water isotopic composition suggests that high salinity was produced by hydrothermal contribution. Materials accumulated in the Sochagota Lake’s southern entrance are organic matter-poor sediments that contain detrital kaolinite and quartz. On the other hand, materials formed at the central segment and near the lake exit (north portion) are enriched in organic matter and characterized by the crystallization of Fe-sulfides. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray spectrometry (EDX) data allowed for the identification of illite and illite-dioctahedral vermiculite mixed layers (I-DV), which are absent in the southern sediments. High humidity and temperate climate caused the formation of small-sized metastable intermediates of I-DV particles by the weathering of the source rocks in the Sochagota Lake Basin. These particles were deposited in the low-energy lake environments (middle and north part). The interaction of these sediments enriched in organic matter with the saline waters of the lake enriched in hydrothermal K caused a reducing environment that favored Fe mobilization processes and its incorporation to I-DV mixed layers that acted as mineral precursor for fast low temperature illitization, revealing that in geothermal areas clays in lakes favor a hydrothermal K uptake.

scholarly journals Belliella aquatica sp. nov., isolated from a saline lake

2015 ◽  
Vol 65 (Pt_5) ◽  
pp. 1622-1627 ◽  
Author(s):  
Zhi-Ping Zhong ◽  
Ying Liu ◽  
Ting-Ting Hou ◽  
Yu-Guang Zhou ◽  
Hong-Can Liu ◽  
...  
Keyword(s):  
Type Species ◽  
Phylogenetic Trees ◽  
Saline Lake ◽  
Qaidam Basin ◽  
Sequence Similarity ◽  
Rrna Gene ◽  
Respiratory Quinone ◽  
Content Type ◽  
Link Type ◽  
Gram Staining

A Gram-staining-negative bacterium, strain TS-T86T, was isolated from Lake Tuosu, a saline lake (salinity 5.4 %, w/w) in Qaidam basin, China. Its taxonomic position was determined by using a polyphasic approach. Strain TS-T86T was strictly heterotrophic, aerobic and catalase- and oxidase-positive. Cells were non-spore-forming, non-motile rods, 0.4–0.6 µm wide and 1.2–2.3 µm long. Growth was observed in the presence of 0–9.0 % (w/v) NaCl (optimum, 2.0 %), at 4–35 °C (optimum, 25 °C) and at pH 7.0–10.5 (optimum, pH 8.5–9.0). Strain TS-T86T contained MK-7 as the predominant respiratory quinone. The major fatty acids (>10 %) were iso-C15 : 1 G, iso-C15 : 0, iso-C17 : 1ω9c, iso-C17 : 0 3-OH and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The polar lipids consisted of phosphatidylethanolamine, an unknown phospholipid, six unidentified aminolipids and two uncharacterized lipids. The DNA G+C content was 35 mol% (T m). Phylogenetic trees based on 16S rRNA gene sequences showed that strain TS-T86T was associated with the genus Belliella , and showed the highest sequence similarity to Belliella baltica BA134T (98.5 %) and then to Belliella kenyensis No.164T (95.7 %) and Belliella pelovolcani CC-SAL-25T (95.3 %). DNA–DNA relatedness of strain TS-T86T to Belliella baltica DSM 15883T was 32±3 %. It is concluded that strain TS-T86T represents a novel species of the genus Belliella , for which the name Belliella aquatica sp. nov. is proposed. The type strain is TS-T86T ( = CGMCC 1.12479T = JCM 19468T).

scholarly journals SEPARATE QUANTITATIVE PREDICTION OF OIL AND GAS CONTENT PROSPECTS FOR DZHEBOL STAGE PALEOZOIC DEPOSITS OF TIMAN-PECHORA OIL AND GAS BASIN

2015 ◽  
pp. 9-15
Author(s):  
A. I. Diyakonov ◽  
L. V. Parmuzina ◽  
S. V. Kochetov ◽  
A. Yu. Malikova
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Scientific Basis ◽  
Source Rocks ◽  
Gas Content ◽  
Quantitative Prediction ◽  
Oil And Gas Resources ◽  
Gas Bearing

It is shown that the evolutionary-catagenetic model for calculating the initial potential hydrocarbon resources can serve as a scientific basis for the separate quantitative prediction of areas of oil-and-gas content. In this case retrospectively evaluated are the scales of generation and accumulation of hydrocarbons in the source rocks during catagenetic evolution of sedimentary basin. The authors propose a method, the results of evaluation of generation and accumulation scales and initial potential oil and gas resources for major oil-and-gas bearing complexes of Dzhebol stage.

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