Seismic Identification of Strike-Slip Fault Damage Zones Based on Structure Tensor Analysis: A Case Study of Ultra-Deep Carbonate Rocks in Fuman Oilfield

doi:10.7657/XJPG20240412

Abstract

Abstract:

Abundant hydrocarbon resources have been discovered in the ultra-deep Ordovician carbonate strike-slip fault damage zones of the Tarim basin. However, these zones cannot be accurately characterized due to the low resolution of seismic data obtained from the ultra-deep layers, thereby restricting the efficient evaluation and target selection of the strike-slip fault-controlled hydrocarbon reservoirs. According to the seismic responses of the strike-slip fault damage zones in the Fuman oilfield, and based on the structure-oriented filtering, the eigenvalues and eigenvectors were calculated by using the structure tensor method, and the projection energy along the fault direction was enhanced by selecting appropriate time windows and stacking vertical thicknesses, which accentuates the strike-slip fault damage zones, enabling a clearer delineation of their boundaries and intensities. The results show that this method provides a clearer depiction of strike-slip fault distribution, allows for the identification of smaller-scale faults, and effectively delineates the width and intensity of ultra-deep carbonate strike-slip fault damage zones, which can be used to evaluate the development degree of the strike-slip fault damage zones. This method can be employed in trap evaluation, well placement, trajectory design, and well monitoring, which will improve drilling success rates and individual well productivity.

Key words: Tarim basin, Fuman oilfield, ultra-deep stratum, carbonate rock, strike-slip fault, damage zone, structure tensor

CLC Number:

P631.445

WANG Rujun, SUN Chong, YUAN Jingyi, LIU Ruidong, WANG Xuan, MA Yinglong, WANG Xupeng. Seismic Identification of Strike-Slip Fault Damage Zones Based on Structure Tensor Analysis: A Case Study of Ultra-Deep Carbonate Rocks in Fuman Oilfield[J]. Xinjiang Petroleum Geology, 2024, 45(4): 475-482.

Figures/Tables 8

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Fig. 7.

Table 1.

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井名	漏失量/m³	放空/m	目前日产油量/t	累计产油量/10⁴ t
W1井	1 027.36		252.02	9.11
W2井	80.38		30.85	2.94
W3井	1 373.39	2.27	124.04	2.64
W4井	1 509.29	2.23	40.86	1.51
W6井	165.95	0.06	70.00	3.14
W7井	598.00		115.00	3.31
W10井	26.20	1.60	73.00	2.81
W12井	689.90	2.41	61.61	2.89
W14井	1 168.40	1.18	35.94	1.18
W16井	722.28		64.36	3.65