Hydrocarbon accumulation and reservoir characteristics of deep marine fault-karst reservoirs in northern Tarim Basin

doi:10.13745/j.esf.sf.2022.10.11

Abstract

Abstract:

The concept of “fault-karst” trap (reservoir) was proposed in 2015 on the basis of author’s experience from carbonate exploration and reservoir development in northern Tarim Basin and their understanding of reservoir/accumulation-control characteristics of fault deformation, karstification and dissolution in the fault zone. Since then fault-karst reservoir has become a new target in carbonate exploration and development in the Tarim Basin. This study further demonstrates that fault-karst reservoirs are not only significantly different from the traditional karst (buried hill) reservoirs, they may also have different genetic types and structural characteristics under different karst environments and structural settings. Fault-karst traps can be divided into three subtypes according to the dissolution conditions and fracture types, and they are characterized by fault-karst storage, deep-fault accumulation, trap structure, vertical dredging, multi-layer accumulation, and segmented reservoir formation. Fault-karst trap (reservoir) is important to oil and gas exploration and development and should be comprehensively studied.

Key words: genetic classification, hydrocarbon accumulation recognition, deep marine facies, fault-karst rock mass, carbonate rock, Tarim Basin

CLC Number:

YANG Debin, LU Xinbian, GAO Zhiqian, CAO Fei, WANG Yan, BAO Dian, LI Shengqing. Hydrocarbon accumulation and reservoir characteristics of deep marine fault-karst reservoirs in northern Tarim Basin[J]. Earth Science Frontiers, 2023, 30(4): 43-50.

Figures/Tables 5

Fig.1 A cross-sectional view of the Siker fault zone and well log log data from the Tahe oblique fault zone in Keping area, Xinjiang

Fig.2 Interpreted seismic profile showing vertical oil and gas dredging channels in the studied fault-karst trap

Fig.3 Schematic diagram illustrating the “multi-layer accumulation” style in the fault-karst reservoir

Fig.4 Bar graphs of original oil column height (a) and water breakthrough sequence (b) for different units of the fault-karst reservoir

Fig.5 Overview of the multi-unit fault-karst reservoir (left) and bar graphs (right) of, from top, initial stratum pressure, pressure retention rate and cumulative production for different units of the fault-karst reservoir

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