scholarly journals Nanoindentation-Based Three-Parameter Fracability Evaluation Method for Continental Shales

2021 ◽  
Vol 9 ◽  
Author(s):  
Siwei Meng ◽  
Dongxu Li ◽  
Qi Wang ◽  
Jiaping Tao ◽  
Jian Su ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Oil And Gas ◽  
Ordos Basin ◽  
Junggar Basin ◽  
Point Of View ◽  
Bohai Bay ◽  
Parameter Evaluation ◽  
Oil And Gas Resources ◽  
The Ordos Basin ◽  
Good Agreement

Shale fracturing evaluation is of great significance to the development of shale oil and gas resources, but the commonly used shale evaluation methods (e.g., the method using the brittleness index based on mineral composition or elastic parameters) have certain limitations. Fractures and beddings affecting fracturing are not considered in these methods. Therefore, it is necessary to develop a new method to evaluate fracturing more comprehensively. The samples used in this research were taken from four typical continental shale basins of China, namely the Bohai Bay Basin, the Ordos Basin, the Songliao Basin, and the Junggar Basin. From a microscopic point of view, a three-parameter evaluation method involving multi-dimensional factors has been developed based on the nanoindentation method. Then, the fracturing coefficient K2 is obtained by combining the ratio β of the fracture indentation to the total indentation and the uneven coefficient m. After that, the fracability coefficient K3 is the ratio of the elastic modulus parallel to bedding to that perpendicular to bedding. Finally, the correlation between fracability coefficients K1, K2, and K3 is used to evaluate the overall fracturing performance of shale. The results of this evaluation method are in good agreement with the actual fracturing performance. It can be concluded that this method is highly reliable and practical and well worthy of promoted applications.

Main Controlled Elements for Accumulation of Ultro-Low Permeability Sandstone Oil Reservoir, Zhenjing Oilfield, Ordas Basin

2013 ◽  
Vol 868 ◽  
pp. 70-73
Author(s):  
Yi Wei Hao ◽  
Hai Yan Hu
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Ordos Basin ◽  
Low Permeability ◽  
Oil Reservoir ◽  
Tight Sandstone ◽  
Buoyant Force ◽  
Accumulation Mechanism ◽  
Oil And Gas Resources ◽  
Low Permeability Reservoirs

Ordos Basin is the second largest sedimentary basin in China with very rich oil and gas resources. The exploration targets are typical reservoirs of low permeability. To determine the accumulation mechanism of tight sandstone reservoir, thin section, SEM, numerical calculation were used. The result showed that sandstone should be ultro-low permeability reservoirs with the high content feldspar and lithic arkose or feldspathic litharenite. The reservoir became tight while oil filling, buoyant force is too small to overcome the resistance of capillary force. Therefore, overpressure induced by source rock generation is the accumulation drive force.

scholarly journals Unconsolidated fault vertical sealing ability evaluation method and its application during Stationary phase

2019 ◽  
Vol 23 (1) ◽  
pp. 35-42
Author(s):  
Ning Sun ◽  
Guang Fu ◽  
Lili Liu ◽  
Jingfeng Wu
Keyword(s):  
Stationary Phase ◽  
Evaluation Method ◽  
Oil And Gas ◽  
Relative Size ◽  
Reservoir Rock ◽  
Bohai Bay ◽  
Filling Material ◽  
Fault Rock ◽  
Sealing Ability ◽  
Oil Gas

To study the vertical distribution of oil, gas in the fracture zone of the oil and gas bearing basin, based on the mechanism and influence factors of vertical sealing oil and gas, this paper has studied the necessary conditions of unconsolidated fault vertical sealing oil, gas, determination method for compaction and diagenetic of the fault filling. Concluded that the static period of fault vertical sealing oil and gas required that fault should be cut by mudstone, through comparing the relative period of the fault rock starting consolidate and the fault stopping activity to determine whether the fracture fillings are compacted into rock. If the time fault rocks began compaction into rock is earlier than the time fault stopped activity, fault filling has been consolidated; otherwise not compaction. By determining the displacement pressure of the fracture filling material and the rock displacement pressure of the underlying reservoir, a method is established to evaluate static unconsolidated fault vertical sealing oil and gas ability by comparing the relative size of the two. Applied it in the evaluation of the vertical sealing capacity f1 in the one to three sections of the Dongying formation and 5 sections of the formation in the southern Bohai Bay Basin. The results show that the fault f1 in one to three of the Dongying formation have the greater filler displacement pressure than the displacement pressure of underlying reservoir rock, as the vertical sealed is favorable for oil and gas accumulation and preservation. It’s accordant with oil and gas distribution has been found in Dongying formation at present in the formation of the South Fort 5 structure, which indicates that the method is feasible to evaluate the vertical sealing ability of the fault in the stationary phase.

scholarly journals Phase States of Hydrocarbons in Chinese Marine Carbonate Strata and Controlling Factors for Their Formation

2012 ◽  
Vol 30 (5) ◽  
pp. 753-773 ◽  
Author(s):  
Jin Zhijun ◽  
Liu Quanyou ◽  
Qiu Nansheng ◽  
Ding Feng ◽  
Bai Guoping
Keyword(s):  
Heat Flow ◽  
Tarim Basin ◽  
Sichuan Basin ◽  
Oil And Gas ◽  
Ordos Basin ◽  
High Heat ◽  
Hydrocarbon Generation ◽  
Oil Accumulation ◽  
The Ordos Basin ◽  
Accumulation History

Chinese marine strata were mainly deposited before the Mesozoic. In the Tarim, Sichuan and Ordos Basins, the marine source rocks are made of sapropelic dark shale, and calcareous shale, and they contain type II kerogen. Because of different burial and geothermal histories, the three basins exhibit different hydrocarbon generation histories and preservation status. In the Tarim Basin, both oil and gas exist, but the Sichuan and Ordos Basins host mainly gas. The Tarim Basin experienced a high heat flow history in the Early Paleozoic. For instance, heat flow in the Late Cambrian varied between 65–75 mW/m2, but it declined thereafter and averages 43.5mW/m2 in the current time. Thus, the basin is a “warm to cold basin”. The Sichuan Basin experienced an increasing heat flow through the Early Paleozoic to Early Permian, and peaked in the latest Early Permian with heat flows of 71–77 mW/m2. Then, the heat flow declined stepwise to the current value of 53.2 mW/m2. Thus, it is a generally a high heat flow “warm basin”. The Ordos Basin has a low heat flow for most of its history (45–55 mW/m2), but experienced a heating event in the Cretaceous, with the heat flow rising to 70–80 mW/m2. Thus, this basin is a “cold to warm basin”. The Tarim Basin experienced three events of hydrocarbon accumulations. Oil accumulation formed in the late stage of Caledonian Orogeny. The generation and accumulation of oil continued in the Northern and Central Tarim (Tabei and Tazhong) till the late Hercynian Orogeny, during which, the accumulated oil cracked into gas in the Hetianhe area and Eastern Tarim (Tadong). In the Himalaya Orogeny, oil cracking occurred in the entire basin, part of the oil in the Tabei and Tazhong areas and most of the oil in the Hetianhe and Tadong areas are converted into gas. In the Sichuan Basin, another triple-episode generation and accumulation history is exhibited. In the Indosinian Orogeny, oil accumulation formed, but in the Yanshanian Orogeny, part of the oil in the eastern Sichuan Basin and most of the oil in the northeastern part was cracked into gas. In the Himalayan Orogeny, oil in the entire basin was converted into gas. The Ordos Basin experienced a double-episode generation and accumulation history, oil accumulation happened in the early Yanshanian stage, and cracked in the late stage. In general, multiple phases of heat flow history and tectonic reworking caused multiple episodes of hydrocarbon generation, oil to gas cracking, and accumulation and reworking. The phases and compositions of oil and gas are mainly controlled by thermal and burial histories, and hardly influenced by kerogen types and source rock types.

Features of Sandy Debris Flows of the Yanchang Formation in the Ordos Basin and Its Oil and Gas Exploration Significance

2011 ◽  
Vol 85 (5) ◽  
pp. 1187-1202 ◽  
Author(s):  
Xiangbo LI ◽  
Qilin CHEN ◽  
Huaqing LIU ◽  
Yanrong WAN ◽  
Lihua WEI ◽  
...  
Keyword(s):  
Debris Flows ◽  
Oil And Gas ◽  
Ordos Basin ◽  
Yanchang Formation ◽  
Oil And Gas Exploration ◽  
The Ordos Basin

Research Progress on Volcanic Rock Reservoirs Based on Properties of Energy Materials in Songliao Basin

2013 ◽  
Vol 703 ◽  
pp. 123-126
Author(s):  
Jing Jun Zhang ◽  
Cheng Zhi Liu
Keyword(s):  
Volcanic Rock ◽  
Oil And Gas ◽  
Comprehensive Evaluation ◽  
Rapid Development ◽  
Junggar Basin ◽  
Songliao Basin ◽  
Research Progress ◽  
Bohai Bay ◽  
Energy Materials ◽  
Oil And Gas Exploration

Properties of Energy Materials (oil and gas) is very complex and important. In recent years, in Chinese eastern, western and mid continental basins, multiple rock oil and gas fields are found, such as Songliao Basin, Bohai Bay Basin, Erlian Basin, Tuha Basin, Junggar Basin, Sichuan Basin. Volcanic rock reservoir with its rich oil and gas resources, tremendous development potential, has aroused the domestic and foreign experts and scholars attention, volcanic rock oil and gas exploration theory and technology has been rapid development. In order to understand volcanic rock reservoir from the origin, further exploration target and guide the exploration deployment, the Properties of Energy Materials (oil and gas), main factors affecting of the development and comprehensive evaluation have become the research hot spots and the focus, there are many research techniques and results.

scholarly journals A Preliminary Study On Remote Sensing Monitoring Method For Oil And Gas Resources- A Case Study In Ordos Basin

2020 ◽  
Vol 194 ◽  
pp. 01003
Author(s):  
Zhao Yuling ◽  
Yang Jinzhong ◽  
Zhang Zhi
Keyword(s):  
Remote Sensing ◽  
Shale Gas ◽  
Coalbed Methane ◽  
Oil And Gas ◽  
Ordos Basin ◽  
Monitoring Method ◽  
Remote Sensing Monitoring ◽  
Unconventional Oil ◽  
Oil And Gas Resources ◽  
Unconventional Oil And Gas

With the continuous improvement of the understanding of the geological law and continuous innovation of unconventional oil and gas exploration and mining technology, China has made great breakthroughs in newly-added geological reserves of unconventional oil and gas resources, such as shale gas, coalbed methane, etc. But for many reasons, attention has not been paid to oil and gas resources (petroleum, natural gas, coalbed methane, shale gas), and regional remote sensing monitoring research has not been carried out. Based on high-resolution remote sensing data of the year 2018 and human-computer interactive interpretation technique, this paper built remote sensing interpretation signs of oil and gas mines, carried out exploration of remote sensing monitoring methods for oil and gas mines, completed remote sensing monitoring over development status of oil and gas mines in Ordos Basin, and proved feasibility of remote sensing monitoring method.

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