Seismic Prediction of Small- to Medium-Sized Fault-Controlled Fracture-Cave Bodies in Shunbei Area, Tarim Basin

doi:10.7657/XJPG20250214

Abstract

Abstract:

The Shunbei area in Tarim Basin develops fault-controlled fracture-cave reservoirs, and good results have been achieved in exploration and development of the main fault zones. In addition to the main fault zones, there are numerous small- to medium-sized faults in the area, which are more abundant, widely distributed, and smaller in scale. Due to the target depth (>8 000 m) and scale, it is difficult for small- to medium-sized faults and their controlled fracture-cave bodies to get clear seismic responses, so to identify and describe them is hard. Based on seismic data interpretation, spectral extension and strong reflection separation techniques were applied to enhance the kinetic information in the seismic data, effectively highlighting the seismic reflection characteristics of the small- to medium-sized fault-controlled fracture-cave bodies. Sensitive attributes were selected depending on the characteristics of different types of reservoirs. The multi-scale coherence of curvelet is found to be sensitive to small- to medium-sized faults, and the attributes such as disorderliness and frequency-division energy can be used to effectively identify fault zones and fracture-cave bodies. Small- to medium-sized fault-controlled fracture-cave bodies were successfully predicted and described by integrating the attributes reflecting different information. This technique was applied in the Shunbei area, which effectively guided well deployment, facilitating the oil and gas development.

Key words: Shunbei area, fault-controlled fracture-cave body, small- to medium-sized fault, seismic prediction, spectral extension, coherence, disorderliness, frequency-division energy

CLC Number:

TE122

LI Hongyan, LIU Jun, GONG Wei, ZHANG Rong. Seismic Prediction of Small- to Medium-Sized Fault-Controlled Fracture-Cave Bodies in Shunbei Area, Tarim Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 240-245.

Figures/Tables 7

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