Distribution pattern and formation mechanism of the strike-slip fault system in the central Tarim Basin

被引：0
|
作者：
Li G. [1 ]
Li S. [1 ]
Li H. [1 ]
Sun C. [1 ]
Xie Z. [1 ]
Li F. [1 ]
机构：
[1] PetroChina Tarim Oilfield Company, Korla
来源：
Natural Gas Industry | 2021年 / 41卷 / 03期
关键词：
Central Tarim Basin; Formation mechanism; Geometric characteristics; Oil and gas exploration target; Ordovician; Strike-slip fault; Transform Fault;
D O I：
10.3787/j.issn.1000-0976.2021.03.004
中图分类号：
学科分类号：
摘要：
Strike-slip faults are developed in the Ordovician carbonate rocks of central Tarim Basin (hereinafter referred to as "platform basin area") and they have an obvious control effect on reservoirs and hydrocarbon accumulation. However, the formation mechanism of strike-slip faults is not figured out clearly, which hampers the oil and gas exploration and development progress in this area. Based on 3D seismic interpretation results, combined with previous research achievements and understandings, this paper describes the overall distribution pattern of strike-slip faults in the platform basin area, and analyzes their geometric characteristics and formation periods. Then, based on the pre-existing tectonic background and regional tectonic stress field, the formation mechanisms of strike-slip faults were discussed and the distribution laws of potential strike-slip faults were predicted. And the following research results were obtained. First, the strike-slip faults in the platform basin area are controlled by pre-existing structures and a united large strike-slip fault system was formed under the action of compression stress from southwest, southeast and north at the end of Middle Ordovician. Second, FⅠ5 fault in the overall pattern of strike-slip faults in the platform basin area is the most important, which adjusts the movement difference between the east and the west blocks, which is the boundary between the east and the west strike-slip fault systems in the platform basin area. The transition faults such as FⅠ10 and FⅠ17 faults decompose the reduction of north-south strata, which form the boundary of the fault system and control the development range of strike-slip faults in the fault system. Third, the strike-slip fault system in the platform basin area can be divided into four systems, namely pure shear fault system in Tabei uplift, left-lateral fault system in Tazhong uplift, right-lateral fault system in Bachu uplift, and transform fault system in Aman transition zone. In conclusion, fault FⅠ5, FⅠ10 and FⅠ17 are of high fault activity strength and they have a strong effect on reservoir reworking and oil and gas migration, so it is currently the most favorable oil and gas exploration target in fault controlled areas. What's more, it is predicted that a transform fault symmetrical to fault FⅠ10 may be developed in the Aman transition zone to the west of fault FⅠ5 and a NE trending strike-slip fault may be developed in the west of Tazhong uplift and Bachu uplift, which is a worthy object for the next oil and gas exploration. © 2021, Natural Gas Industry Journal Agency. All right reserved.
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页码：30 / 37
页数：7
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