5 results on '"Ziyuan Xu"'
Search Results
2. Integrated geophysical studies on the distribution of Quaternary biogenic gases in the Qaidam Basin, NW China
- Author
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Dade Ma, YU Shi-yong, Ziyuan Xu, QI Xiao-ping, Youyan Zhang, Hui Yang, and Baihong Wen
- Subjects
Gravity (chemistry) ,Anomaly (natural sciences) ,Compaction ,Energy Engineering and Power Technology ,Geology ,Geophysics ,Structural basin ,Geotechnical Engineering and Engineering Geology ,Residual ,Gravity anomaly ,Physics::Geophysics ,Natural gas field ,Geochemistry and Petrology ,lcsh:TP690-692.5 ,Economic Geology ,Quaternary ,lcsh:Petroleum refining. Petroleum products - Abstract
Quaternary biogenic gas fields in the Sanhu area of the Qaidam Basin are characterized by gentle structures, shallow burial, weak compaction, high porosity and great bulk thickness, which determine their unique geophysical anomalies, such as the locally low gravity, micro-magnetic high frequency anomaly, seismic event push-down and attribute anomaly. An integrated geophysical processing and interpretation scheme is put forward for shallow biogenic gas prediction in this area. Amplitude preservation is performed for 1:100000 gravity data and the processing results are correlated with known gas distributions and aeromagnetic results, remote sensing and seismic hydrocarbon detection. This study shows that the residual gravity low anomaly has a good correlation with the gas field and, as an important feature of the biogenic gas field, the amplitude of residual gravity low anomaly is directly proportional to the measure of gas reservoir. Based on the residual gravity low anomaly and other exploration data, the distribution of gas reservoirs in the Sanhu area is characterized by vertical overlapping, lateral zoning and local enrichment. Residual gravity anomaly, in combination with regional geologic data, reveals three favorable zones, one fairly favorable zone (low gas production zone), five possibly favorable zones and four favorable targets. Key words: Qaidam Basin, Sanhu area, Quaternary, biogenic gas, gravity, magnetic, seismic, geophysical integration, exploration direction more...
- Published
- 2012
- Full Text
- View/download PDF
Catalog
3. Biogenic gas systems in eastern Qaidam Basin
- Author
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Wenzhi Zhao, Ziqiang Guan, Yanhu Tan, Dade Ma, Huitong Wang, Ziyuan Xu, Yanhua Shuai, Aiguo Su, Maowen Li, Shuichang Zhang, Yuqi Dang, and Xinling Chen
- Subjects
geography ,Plateau ,geography.geographical_feature_category ,business.industry ,Stratigraphy ,Anticline ,Geochemistry ,Geology ,Oceanography ,Methane ,chemistry.chemical_compound ,Paleontology ,Geophysics ,chemistry ,Natural gas ,Clastic rock ,Facies ,Economic Geology ,Sedimentary rock ,Quaternary ,business - Abstract
Several giant biogenic gas fields (with proven gas reserves greater than 25 billion cubic meters) have been discovered in recent years in the Sanhu area of eastern Qaidam Basin. This area has an average surface altitude of around 2800 m, and forms the northern segment of the Qinghai-Tibet Plateau. The biogenic gas fields occur mostly within or adjacent to the depocenter of approximately 3400 m of Quaternary sediments. The gas reservoirs, with burial depth generally less than 1900 m, are unconsolidated sandstones with approximately 24–40% porosity, and are interbedded with mudstones containing on average 0.3% TOC. The occurrence of methanogens in the shallow Quaternary sediments appears to depend on both the sedimentary facies and burial depths, thus most of the biogenic gases in the Sanhu area appears to have derived from the source kitchens in the central sag above a biogenic gas floor at the depth around 1800 m. The key gas system elements for the formation of the giant biogenic gas accumulations include (1) secular low surface temperatures and lake water hypersalinity favor the preservation of suitable organic substrates for biogenic methane generation, (2) well-developed sand and mud interbeds, (3) sufficient cumulative thickness of water-saturated mudstones as caprocks, (4) presence of syndepositional anticlines of Pleistocene and later age, (5) a regional hydrogeological system favoring northeastward gas migration, and (6) ongoing dynamic gas migration and accumulation with abundant gas supply. more...
- Published
- 2008
- Full Text
- View/download PDF
4. Exploring shallow biogenic gas with high‐precision gravity data
- Author
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Ziyuan Xu, Shiyong Yu, Hui Yang, Baihong Wen, Youyan Zhang, Xiaoping Qi, and Dade Ma
- Subjects
Natural gas field ,Gravity (chemistry) ,Compaction ,Biogenic gas ,Geophysics ,Structural basin ,Petrology ,Quaternary ,Porosity ,Low Gravity ,Geology - Abstract
Quaternary biogenic gas reservoirs in Sanhu area of Qaidam Basin, China are featured by gentle structure, shallow burial, weak formation compaction, high porosity and large thickness, which determine their unique geophysical anomalies. Amplitude preservation processing of 1:100,000 gravity data and correlation with Tainan and Sebei-1 gas fields are carried out. Study shows that local low gravity corresponds to biogenic gas reservoir and local low residual gravity is an important geophysical characteristic of shallow biogenic gas reservoir. It is presented that Sanhu gas reservoirs distribution are featured by vertical overlapping, lateral zoning and local enrichment. more...
- Published
- 2011
- Full Text
- View/download PDF
5. Integrated geophysical studies on the distribution of Quaternary biogenic gases in the Qaidam Basin, NW China.
- Author
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Hui, Yang, Youyan, Zhang, Dade, Ma, Baihong, Wen, Shiyong, Yu, Ziyuan, Xu, and Xiaoping, Qi
- Subjects
GEOPHYSICS ,HYDROCARBONS ,REMOTE sensing ,GAS reservoirs ,QUATERNARY Period ,GAS fields - Abstract
Abstract: Quaternary biogenic gas fields in the Sanhu area of the Qaidam Basin are characterized by gentle structures, shallow burial, weak compaction, high porosity and great bulk thickness, which determine their unique geophysical anomalies, such as the locally low gravity, micro-magnetic high frequency anomaly, seismic event push-down and attribute anomaly. An integrated geophysical processing and interpretation scheme is put forward for shallow biogenic gas prediction in this area. Amplitude preservation is performed for 1:100000 gravity data and the processing results are correlated with known gas distributions and aeromagnetic results, remote sensing and seismic hydrocarbon detection. This study shows that the residual gravity low anomaly has a good correlation with the gas field and, as an important feature of the biogenic gas field, the amplitude of residual gravity low anomaly is directly proportional to the measure of gas reservoir. Based on the residual gravity low anomaly and other exploration data, the distribution of gas reservoirs in the Sanhu area is characterized by vertical overlapping, lateral zoning and local enrichment. Residual gravity anomaly, in combination with regional geologic data, reveals three favorable zones, one fairly favorable zone (low gas production zone), five possibly favorable zones and four favorable targets. [Copyright &y& Elsevier] more...
- Published
- 2012
- Full Text
- View/download PDF
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