准噶尔盆地南缘下组合储层异常高压成因机制及演化特征

doi:10.11743/ogg20200511

Abstract

Abstract:

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.

Key words: tectonic compression, overpressure transmission, deep zone, abnormal high pressure, lower play, Junggar Basin

CLC Number:

TE122.2

Fengqi Zhang, Xuesong Lu, Qingong Zhuo, Hongli Zhong, Pei Zhang, Chi Wei, Wei Liu. Genetic mechanism and evolution characteristics of overpressure in the lower play at the southern margin of the Junggar Basin, northwestern China[J]. Oil & Gas Geology, 2020, 41(5): 1004-1016.

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井号	层位	埋深/m	水平最大主应力(σ_H)/MPa	垂向载荷应力(σ_V)/MPa	两者应力对比	两者应力差值/MPa
Q009	J₂x	677.78	62.16	16.27	σ_H>σ_V	45.90
Fc1	K₁q	5 784.50	126.99	138.89	σ_H < σ_V	-11.90
Sc1	J₂x	4 188.70	95.62	100.57	σ_H < σ_V	-5.00
Ds1	J₃q	6 417.90	254.51	155.60	σ_H>σ_V	98.90
Q1	J₂x	2 653.50	126.78	63.71	σ_H>σ_V	63.10
H001	E_2-3a	3 180.00	115.52	77.39	σ_H>σ_V	38.13

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

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