Segmentation of Strike-Slip Faults and Its Controls on Hydrocarbon Accumulation in Tarim Basin: A Case Study of FⅠ17 Strike-Slip Fault Zone

doi:10.7657/XJPG20240405

Abstract

Abstract:

In the Ordovician carbonate rocks in the Tarim basin, there are extra-large oil and gas oilfields controlled by strike-slip faults. However, the distributions of carbonate reservoirs and hydrocarbons along the fault zones is extraordinarily complex, posing challenges for well deployment and efficient petroleum development. Taking the F_Ⅰ17 hydrocarbon-rich strike-slip fault zone as an example, a fine structural analysis was conducted by using high-resolution seismic data. Coupling with core, logging and production data, the reservoir distribution and its controls on hydrocarbon accumulation were investigated. The results show that the F_Ⅰ17 strike-slip fault zone can be divided into five segments from south to north: parallel en echelon segment, linear segment, superimposed segment, oblique superimposed segment, and horse-tail segment. The distribution, scale, and type of strike-slip faults govern the reservoir distribution and development. From the parallel en echelon segment to the oblique superimposed segment, the fault development intensifies, resulting in larger and more interconnected reservoirs. Conversely, the horse-tail segment in the north features reservoirs distributed along branch faults with poor connectivity. The fault-controlled hydrocarbon reservoirs in the F_Ⅰ17 strike-slip fault zone can be classified into four types: linear fixed-volume, connected superimposed, superimposed fault-block, and tail-end dispersed. The type and scale of strike-slip faults control the reservoir types and hydrocarbon enrichment levels, necessitating targeted drilling strategies for different fault-controlled reservoir types.

Key words: Tarim basin, Ordovician, carbonate rock, strike-slip fault, fault segmentation, fault-controlled reservoir, fault control on hydrocarbon accumulation

CLC Number:

TE122

XIONG Chang, SHEN Chunguang, ZHAO Xingxing, ZHAO Longfei, LI Shengqian, ZHOU Jie, PAN Tiancou. Segmentation of Strike-Slip Faults and Its Controls on Hydrocarbon Accumulation in Tarim Basin: A Case Study of F_Ⅰ17 Strike-Slip Fault Zone[J]. Xinjiang Petroleum Geology, 2024, 45(4): 417-424.

Figures/Tables 6

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Table 1.

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分段序号	分段类型	地层	断裂性质	级次	长度/km	最大高差/m
Ⅰ段	平行雁列段	寒武系—奥陶系	压扭	Ⅰ级	10	72
Ⅱ段	线性段	寒武系—奥陶系	压扭	Ⅰ级	8	110
Ⅲ段	叠覆段	奥陶系—泥盆系	压扭	Ⅰ级	5	136
Ⅳ段	斜列叠覆段	奥陶系—泥盆系	张扭	Ⅰ级	6	158
Ⅴ段	马尾段	奥陶系—泥盆系	压扭	Ⅰ级	5	160