Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (6): 239-251.DOI: 10.13745/j.esf.sf.2022.8.17

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Control of strike-slip fault on the large carbonate reservoir in Fuman, Tarim Basin—a reservoir model

WANG Qinghua1(), YANG Haijun1, LI Yong1, LÜ Xiuxiang2,3, ZHANG Yintao1, ZHANG Yanqiu1, SUN Chong1, OUYANG Siqi2,3   

  1. 1. PetroChina Tarim Oilfield Campany, Korla 841000, China
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
    3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2022-07-07 Revised:2022-07-27 Online:2022-11-25 Published:2022-10-20

Abstract:

The exploration target for deep marine hydrocarbon in the platform basin area, Tarim Basin has changed from interlayer karst to fault-controlled reservoir, and a strike-slip fault- controlled oilfield is discovered in the Fuman depression area. The strike-slip fault and reservoir characteristics of the Fuman area differ from the paleo-uplift slope area of the basin. Therefore, it is necessary to establish a fault-control reservoir model for the study area. In this paper, the strike-slip fault system is described based on high-density 3D seismic data; the distribution pattern of different types of reservoirs is revealed by core, logging, and fracture-cavity recognition technology; the impact of strike-slip fault style and differential deformation on reservoir development is analyzed; and a strike-slip fault-control reservoir model is established. Here are the main conclusions: (1) The large carbonate hydrocarbon accumulation area of Fuman mainly contains cave, fracture-hole, fracture, and hole-pore type reservoirs formed by multi-stage strike-slip faulting and karstification. (2) Differential deformation of strike-slip faults controls the reservoir type and reservoir distribution by influencing the extent of the fracture zone and the fluid activity range—larger activity range corresponds to larger fracture zone, and reservoir development in the tenso- and compresso-shear sections is better than in the linear section. (3) The tenso-shear section is a catchment area with good fault connectivity conducive to meteoric water infiltration and thermal fluid upwelling for carbonate dissolution. The compresso-shear section, on the other hand, is a distributary area, where karst reservoirs developed mostly on the two sides of the fault zone, with relatively small fracture opening thus lesser fluid transformation compared to the tenso-shear section.

Key words: strike-slip fault, reservoir, Fuman area, Aman transition zone, Tarim Basin

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