Characteristics of the S80 strike-slip fault zone and its controlling effects on the Ordovician reservoirs in the Tahe oilfield，Tarim Basin

被引：0
|
作者：
Han, Pengyuan [1 ,2 ]
Ding, Wenlong [1 ,2 ]
Yang, Debin [1 ,2 ,3 ]
Zhang, Juan [1 ,2 ,3 ]
Ma, Hailong [3 ]
Wang, Shenghui [1 ,2 ]
机构：
[1] School of Energy Resources, China University of Geosciences（Beijing）, Beijing,100083, China
[2] Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences（Beijing）, Beijing,100083, China
[3] Exploration and Development Research Institute, Northwest Oil Field Company, SINOPEC, Xinjiang, Urumqi,830011, China
来源：
Oil and Gas Geology | 2024年 / 45卷 / 03期
关键词：
A fine interpretation of the S80 strike-slip fault zone in the Tahe area of Tarim Basin is carried out by comprehensively utilizing core data; logs; the widths and total volume of the lost intervals in individual wells; high-precision 3D seismic data; and multilayer coherence attributes. Its spatial distribution; and activity intensity and stages are determined thereby; and its controlling effects on the Ordovician reservoirs are explored. The findings indicate that the S80 strike-slip fault zone can be divided into the western; central; and eastern subzones along its strike. These three subzones generally show a noticeable increase in the number; length; and width of overlapping segments from the Cambrian to the Ordovician strata vertically. Laterally; the S80 strike-slip fault zone; from SW to NE; exhibits the contraction of its transtensional segments; the expansion of its transpressional segments; and the gradual disappearance of its pure strike-slip segment. Furthermore; the activity of this fault zone proves strong in its central subzone but weak in its western and eastern subzones. The S80 strike-slip fault zone experienced four activity stages; namely the Middle Caledonian; the Late Caledonian-Early Hercynian; the Late Hercynian; and the Indosinian-Early Himalayan; with the former two stages predominating. This fault zone experienced sinistral strike-slip in the former two stages but dextral in the latter two stages. Three types of reservoirs are developed along the S80 strike-slip fault zone：cavernous; compound （fractured-vuggy and vuggy-fractured types）; and fractured types. The development of dissolution vugs is closely related to the segmented activity of strike-slip faults; with the transpressional and translational segments featuring strong activity; as well as the periphery of the major faults of the transtensional segment characterized by weak activity; serving as favorable parts for the development of dissolution vugs. The transpressional segment of the Middle Ordovician Yijianfang Formation exhibits a high linear density of fractures; while those of the Middle Ordovician Yijianfang Formation to the Middle-Lower Ordovician Yingshan Formation show a significantly decreased linear density of fractures vertically; leading to a limited dissolution capacity. The transtensional segment in the Middle Ordovician Yijianfang Formation has a moderate linear density of fractures; and those of the Middle Ordovician Yijianfang Formation to the Middle-Lower Ordovician Yingshan Formation exhibit well-developed fractures and dissolution vugs with an elevated number and scale; establishing this interval as a favorable area for reservoir development. © 2024 Editorial Department of Oil and Gas Geology. All rights reserved;
D O I：
10.11743/ogg20240314
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页码：770 / 786
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