Ordovician Differential Deformation Mechanism of Northern Section of FⅠ17 Strike-Slip Fault, Tarim Basin

doi:10.7657/XJPG20240403

Abstract

Abstract:

To understand the role of strike-slip faults in hydrocarbon accumulation in carbonate reservoirs, based on 3D seismic data, the development characteristics and tectonic deformation processes of the northern section of the F_Ⅰ17 strike-slip fault in the Tarim basin were analyzed, and a sandbox physical simulation was performed on the formation and evolution of strike-slip faults by using geological modeling. The F_Ⅰ17 strike-slip fault is divided into two sections. The southern section, nearly NE-SW trending, is characterized by en echelon faults, with the Yijianfang formation showing a uplifting feature and significant vertical deformation during the Ordovician period. The northern section, nearly NNE-SSW trending, is dominated by linear strike-slip faults, with the Yijianfang formation exhibiting weak deformation and slight subsidence in local areas during the Ordovician period. Sandbox physical simulation results show that a series of uplift zones formed along the main displacement zone of linear strike-slip faults, while the deflected strike-slip faults formed a series of uplift zones in the southern section and presented strata subsidence in the northern section. Under identical stress conditions, differences in the initial strikes of strike-slip faults lead to the changes in the stress put on the faults, thereby influencing their evolution processes. The southern section of the F_Ⅰ17 strike-slip fault is found with more concentrated stress in compressional uplift zone and more developed fractures and vugs locally, containing richer hydrocarbons. The southern section is expected to be superior in exploration to the northern section.

Key words: Tarim basin, Aman transitional zone, Ordovician period, strike-slip fault, differential deformation mechanism, physical simulation

CLC Number:

TE121.2

CAI Zhenzhong, LI Bing, LUO Xiao, LI Huiyuan, LI Mengqin, LI Zhengyang, WANG Qinghong. Ordovician Differential Deformation Mechanism of Northern Section of F_Ⅰ17 Strike-Slip Fault, Tarim Basin[J]. Xinjiang Petroleum Geology, 2024, 45(4): 401-408.

Figures/Tables 8

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类型	厚度/ m	密度/ （g·cm^-3）	重力加速度/ （m·s^-2）	黏聚强度/Pa	黏度/ （Pa·s）	速率/ （m·s^-1）
实验模型	1	1.13	9.8	50~500	1.2×10⁴	1×10^-5
地质原型	1×10⁵~5×10⁵	2.30~2.50	9.8	1×10⁷~5×10⁷	1.0×10¹⁹	3×10^-10

位移量/ cm	第一组实验	第二组实验
位移量/ cm	北段与南段一致	北段	南段
1	右阶雁列式断裂（R破裂），地层微幅度隆起	右阶雁列式断裂（R破裂），地层略微下掉	未产生断裂，地层条带状微幅度隆起
2	R破裂长度增大，Y破裂形成并连接R破裂，地层隆起幅度更大	R破裂长度增大，Y破裂形成并连接R破裂，地层下掉幅度增大	右阶排列的R破裂，地层隆起幅度增大
3	R破裂不再活动，Y破裂走滑位移增大	地层下掉幅度显著增大，形成窄而长的地堑	主位移带形成并贯穿褶皱长轴，切割R破裂