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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/08031514030
Identification and calculation of transfer
overpressure
in the northern Qaidam Basin, northwest China


Changyu Fan,1 Zhenliang Wang,2 Aiguo Wang,3 Suotang Fu,4 Liqun Wang,5 Yongshu Zhang,6 Hongxi Kong,7 and Xiao Zhang8
1State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi’an 710069, China; fancy@nwu.edu.cn
2State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi’an 710069, China; wangzl@nwu.edu.cn
3State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi’an 710069, China; wag@nwu.edu.cn
4Qinghai Oilfield Company, CNPC, Dunhuang, Gansu 73200, China; fstqh@petrochina.com.cn
5Exploratory Development Institute, Qinghai Oilfield Company, CNPC, Dunhuang, Gansu 73200, China; wanglqqh@petrochina.com.cn
6Exploratory Development Institute, Qinghai Oilfield Company, CNPC, Dunhuang, Gansu 73200, China; zysqh@petrochina.com.cn
7Exploratory Development Institute, Qinghai Oilfield Company, CNPC, Dunhuang, Gansu 73200, China; khxqh@petrochina.com.cn
8Department of Geology, Northwest University, Xi’an 710069, China; 7starsseeker@zhangxiao.org.cn
ABSTRACT
The origin of the overpressure
in the northern Qaidam Basin has not been clearly understood, which has caused some difficulties in
hydrocarbon
exploration. Using a compaction study, we applied a modified acoustic-velocity and effective-stress diagram to identify the
overpressure
transfer in the study area. This phenomenon has not been discussed in previous studies. For the present study, we approximately calculated the magnitude of the transfer
overpressure
and analyzed the cause of the overpressured aquifer at the crest of the anticline in the study area. Our study indicates that the effect of
overpressure
transfer is very distinct, and the largest contribution to the total
overpressure
is 57%. The main media of
overpressure
transfer include vertical faults and lateral conducting layers. The vertical faults can connect deep overpressured strata, and the lateral conducting layers can connect overpressured strata at the top and wing of the anticline. During anticline formation, the crest fractures, and then the overpressured water in the anticline wing flows into the fractured crest and forms the
overpressure
compartment that prevents the charging of deeper natural gas.
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