Genetic mechanism and evolution characteristics of overpressure in the lower play at the southern margin of the Junggar Basin, northwestern China

被引：0
|
作者：
Zhang F. [1 ,2 ]
Lu X. [3 ]
Zhuo Q. [3 ]
Zhong H. [4 ]
Zhang P. [1 ]
Wei C. [1 ]
Liu W. [1 ]
机构：
[1] College of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, 710065, Shaanxi
[2] Provincial Key Lab of Hydrocarbon Accumulation Geology, Xi'an Shiyou University, Xi'an, 710065, Shaanxi
[3] Research Institute of Petroleum Exploration and Development, PetroChina, Beijing
[4] College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
来源：
| 1600年 / Editorial Department of Oil and Gas Geology卷 / 41期
关键词：
Abnormal high pressure; Deep zone; Junggar Basin; Lower play; Overpressure transmission; Tectonic compression;
D O I：
10.11743/ogg20200511
中图分类号：
学科分类号：
摘要：
Intensive tectonic compression during the late Himalayan resulted in overpressure of complex evolution history in the lower play at the southern margin of the Junggar Basin. Based on an integration of formation pressure with geological data, this study discusses the features of log responses and comprehensive compaction of sandstone and mudstone in the lower play of the study area. The genetic mechanisms of the overpressure in the play are identified in combination with modified overpressure recognition diagrams and paleo-tectonic stress measured by Kaiser effect. The evolution characteristics of these mechanisms and their contribution to the current overpressure are also quantitatively evaluated based on the numerical simulation of both tectonic stress and overburden on compaction. The results show that horizontal tectonic compression is the main cause of the over-pressurized Qigu Formation in the lower play of the study area, followed by vertical disequilibrium compaction and overpressure transmission vertically along the faults and laterally in sandstone.The vertical disequilibrium compaction began to develop in certain parts of the study area since the Paleogene to the deposition of the Taxihe Formation. Its contribution to the presently over-pressurized Qigu Formation in the eastern Sikeshu Sag and the east part of the third row of structural belt in the play are 1.4% and 33.3%, respectively. The continuous tectonic compression in high intensity led to a rapid increase of overpressure in the lower play since the end of the Taxihe depositional period, with contributions of 65.8% and 50.8% respectively to the overpressure in the formation of the two locations. The overpressure transmission mechanism was initiated and accelerated in the deep reservoirs of the play since the end of the Dushanzi depositional period, especially the Quaternary, when anticlines and faults were formed. Its contributions to the overpressure of the formation in the two locations are 32.8% and 15.9%, respectively. © 2020, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：1004 / 1016
页数：12
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