scholarly journals Formation mechanisms and distribution of weathered volcanic reservoirs: A case study of the carboniferous volcanic rocks in Northwest Junggar Basin, China

2020 ◽  
Vol 8 (8) ◽  
pp. 2841-2858
Author(s):  
Cunhui Fan ◽  
Hu Li ◽  
Qirong Qin ◽  
Ling Shang ◽  
Yunfeng Yuan ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Junggar Basin ◽  
Formation Mechanisms ◽  
Volcanic Reservoirs

Characteristics and prediction of weathered volcanic rock reservoirs: A case study of Carboniferous rocks in Zhongguai paleouplift of Junggar Basin, China

2018 ◽  
Vol 6 (2) ◽  
pp. T431-T447 ◽  
Author(s):  
Xiaoming Sun ◽  
Siyuan Cao ◽  
Xiao Pan ◽  
Xiangyang Hou ◽  
Hui Gao ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Volcanic Rocks ◽  
Geophysical Methods ◽  
Junggar Basin ◽  
Hydrocarbon Exploration ◽  
Background Information ◽  
Long Time ◽  
Volcanic Reservoirs ◽  
Fluid Detection

Volcanic reservoirs have been overlooked for hydrocarbon exploration for a long time. Carboniferous volcanic rocks of the Zhongguai paleouplift contain proven reserves of [Formula: see text]. We have investigated the volcanic reservoirs integrating cores, well, and seismic data, and the proposed volcanic reservoir distribution is controlled by the weathering function, fractures, and lithology. The weathering process makes the originally tight igneous rocks become good-quality reservoirs, and fractures play an important role in connecting different types of pores and act as reservoir space. Isolated and ineffective pores become effective ones due to connection among fractures. Only volcanic breccia can be good-quality reservoirs without any weathering function. The nonlinear chaos inversion controlled by weathered layers shows that the good-quality reservoirs are distributed in the top of the weathering crust and the structural high. Furthermore, fluid-detection attributes and background information prove that oil and gas are distributed along the paleostructural high. The objectives of this study were to (1) describe the characteristics of volcanic reservoirs and determine the controlled rules for reservoir distribution, (2) characterize the distribution of reservoirs and hydrocarbon, and (3) propose an effective workflow for hydrocarbon exploration in volcanic rocks combining geologic and geophysical methods.

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. 

The Physical Properties and their Prediction of Volcanic Reservoirs in Luxi Area of Junggar Basin, China

2012 ◽  
Vol 616-618 ◽  
pp. 228-233
Author(s):  
Zhong Chun Sun ◽  
Zhong Hong Chen ◽  
Yu Hua Kong ◽  
Wen Liu ◽  
Men Yun Yang
Keyword(s):  
Physical Properties ◽  
Volcanic Rocks ◽  
Junggar Basin ◽  
Electrical Parameters ◽  
Clastic Rocks ◽  
Close Relationship ◽  
Porosity And Permeability ◽  
Different Characteristics ◽  
Volcanic Reservoirs ◽  
The Relationship

The physical properties of reservoirs determine the ability on accumulating hydrocarbon. As one of the unconventional hydrocarbon reservoirs, the volcanics own the different characteristics from the clastic rocks on physical properties. The study on the relationship between physical and electrical properties of deep volcanic reservoirs was conducted, using the Luxi area of Junggar basin as an example. By our study, some conclusions have been made: The heterogeneity of physical properties is strong in volcanic rocks whose porosity and permeability vary in different lithology and lithofacies; different rocks in a same well have various values of porosity and permeability, and a certain type of volcanic rock has different values of porosity and permeability in diverse wells. According to measured data, the value of porosity an permeability in erupting and effusive facies area are high, while in volcanic channel and extrusive facies as well as volcanic sedimentation facies are low. Unlike the clastic rocks, in volcanic rocks there is little relationship between porosity and permeability and all of them do not have close relationship to the buried depth. Different electrical responses have different relationship with the porosity of one certain lithology, while one certain electrical property has different responses for the porosities of different lithologies; comparatively speaking, the porosities of tuffites, breccia correlate intensively with GR, SP and AC, so these electrical parameters can be utilized to predict the physical properties. This study illustrated that the relativities between porosity and GR, AC, and SP are Por=-0.6189×GR+52.691 (R2=0.9311), Por =-0.3771×AC + 34.5 (R2=0.8876) and Por = 2.1458×SP + 79.404 (R2=0.8236).

Fault and fracture identification in volcanic reservoirs: A case study from the Junggar Basin

2017 ◽  
Author(s):  
Hanpeng Cai ◽  
Huiqin Zuo ◽  
Chuanyong Wen ◽  
Feng Qian ◽  
Haoguo Shi ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Fracture Identification ◽  
Volcanic Reservoirs

Characteristics and formation mechanisms of large volcanic rock oil reservoirs: A case study of the Carboniferous rocks in the Kebai fault zone of Junggar Basin, China

AAPG Bulletin ◽  
2016 ◽  
Vol 100 (10) ◽  
pp. 1585-1617 ◽  
Author(s):  
Zhonghong Chen ◽  
Xulong Wang ◽  
Ming Zha ◽  
Yueqian Zhang ◽  
Yingchang Cao ◽  
...  
Keyword(s):  
Volcanic Rock ◽  
Fault Zone ◽  
Junggar Basin ◽  
Oil Reservoirs ◽  
Formation Mechanisms

scholarly journals Reservoir Formation Model and Main Controlling Factors of the Carboniferous Volcanic Reservoir in the Hong-Che Fault Zone, Junggar Basin

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 6114
Author(s):  
Danping Zhu ◽  
Xuewei Liu ◽  
Shaobin Guo
Keyword(s):  
Physical Properties ◽  
Fault Zone ◽  
Oil And Gas ◽  
Hanging Wall ◽  
Volcanic Rocks ◽  
Soil Layer ◽  
Junggar Basin ◽  
Weathering Crust ◽  
Volcanic Reservoir ◽  
Volcanic Reservoirs

The Hong-Che Fault Zone is one of the important oil and gas enrichment zones in the Junggar Basin, especially in the Carboniferous. In recent five years, it has been proven that the Carboniferous volcanic rock has 140 million tons of oil reserves, and has built the Carboniferous volcanic reservoir with a capacity of million tons. Practice has proven that the volcanic rocks in this area have great potential for oil and gas exploration and development. To date, Carboniferous volcanic reservoirs have been discovered in well areas such as Che 32, Che 47, Che 91, Chefeng 3, Che 210, and Che 471. The study of drilling, logging, and seismic data shows that the Carboniferous volcanic reservoirs in the Hong-Che Fault Zone are mainly distributed in the hanging wall of the fault zone, and oil and gas have mainly accumulated in the high part of the structure. The reservoirs are controlled by faults and lithofacies in the plane and are vertically distributed within 400 m from the top of the Carboniferous. The Carboniferous of the Hong-Che Fault Zone has experienced weathering leaching and has developed a weathering crust. The vertical zonation characteristics of the weathering crust at the top of the Carboniferous in the area of the Che 210 well are obvious. The soil layer, leached zone, disintegration zone, and parent rock developed from top to bottom. Among these reservoirs, the reservoirs with the best physical properties are mainly developed in the leached zone. Based on a comprehensive analysis of the Carboniferous oil and gas reservoirs in areas of the Chefeng 3 and Che 210 wells, it is believed that the formation of volcanic reservoirs in the Hong-Che Fault Zone was mainly controlled by structures and was also controlled by lithofacies, unconformity surfaces, and physical properties.

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