Fault zone architecture of strike-slip faults in deep, tight carbonates and development of reservoir clusters under fault control: A case study in Shunbei

doi:10.13745/j.esf.sf.2023.2.32

Abstract

Abstract:

Combining seismic attribute analysis, well/imaging logging, coring calibration, and production performance data analysis, the fault zone architecture of the Shunbei No. 4 fault zone is determined and statistically analyzed to obtain insights into the characteristics of reservoir development under strike-slip fault control. The results show that the type of reservoir rock space is determined by the fault zone architecture which, in turn, is controlled by the segmentation structural style of the fault zone, as are the locations of favorite fractures and caves. In fact, the development of reservoir rocks in the interior of the fault zone is highly inhomogeneous, as fault braccias and damage zones usually develop into clusters within a single seismic-scale fault plane, with wall rocks in between the fracture zones. The fault zone architecture differs under different segmentation structural styles (e.g., push-ups, pull-aparts, strike-slip, etc.). The push-up structure is characterized by high fracture intensity, with densely distributed fault breccias and fracture zones; whereas in the pull-apart structure fault braccias/fracture zones are mostly localized in fault plane boundaries where the fault zone architecture is less developed. In comparison, the strike-slip structure is characterized by lower fracture intensity and the least number of fault zones and greater spacing between them. To maximize the production of effective reservoirs and obtain higher single-well productivity, the well trajectory should be designed based on the fault zone architectural characteristics under different structural styles. As the productivity of a single well per unit pressure drop is taking into account, it is clear that the size of the reservoir is not the only factor controlling the single-well productivity but also the reservoir connectivity across different segments.

Key words: carbonate reservoir, fault zone architecture, strike-slip fault, cluster development, Shunbei oil and gas field, Tarim Basin

CLC Number:

TE121.1

LI Yingtao, DENG Shang, ZHANG Jibiao, LIN Huixi, LIU Yuqing, QIU Huabiao, HUANG Cheng, LIU Dawei, YAO Yili. Fault zone architecture of strike-slip faults in deep, tight carbonates and development of reservoir clusters under fault control: A case study in Shunbei[J]. Earth Science Frontiers, 2023, 30(6): 80-94.

Figures/Tables 16

Fig.1 Differences in deformation characteristics and porosity-permeability structures of high-porosity and tight carbonate fault zones. Modified after [19].

Fig.2 Distribution of strike-slip fault systems in Shunbei area and its surroundings in Tarim Basin

Fig.3 Distribution characteristics of layers in the Shunbei No.4 fault zone

Fig.4 Typical subsection style of Shunbei No.4 fault zone

Fig.5 Schematic diagram of well logging interpretation and fault core - damage zone structure calibration in well Shunbei 47X

Fig.6 Fracture-cavity response characteristics of single well test curve in Shunbei No.4 fault zone

Fig.7 Structural characteristics of internal coring in the section of well Shunbei 44X

Fig.8 Internal structural characteristics of compression section in well Shunbei 47X

Fig.9 Logging response characteristics of typical drilling in different segments of Shunbei No.4 fault zone

Fig.10 Internal structural characteristics of tension section of well Shunbei 44X

Fig.11 Internal structural characteristics of the slip section of well Shunbei 46X

Table 1 Structure data table of inner fault core and damage zone structure of single well in ShunbeiNo.4 fault zone

Fig.12 Statistics on broken breccia and fracture zones

Table 2 Statistical table of inner inner fault core and damage zone structure data of different segment types of ShunbeiNo.4 fault zone

Fig.13 The development model of the cluster structure inside the strike-slip fault section

Fig.14 Differences in drilling effects of internal well trajectories in different fault core and damage zone structure structures

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