Spatial Structure Characterization Technology and Engineering Practice of Ultra-deep Fault-Controlled Carbonate Reservoir

Abstract

In the context of actively promoting deep geological engineering, ultra-deep fault-controlled fractured carbonate reservoirs have become a focal point in oil and gas exploration and development. Precise interpretation of ultra-deep strike-slip faults, internal configuration modeling of fractured reservoirs, assessment of reserves sculpted by fault control, efficient well deployment, and enhanced recovery have emerged as crucial scientific challenges and technological barriers in increasing reserves and production in the ultra-deep domain. This study comprehensively constructs fracture structural analysis techniques utilizing regional stress field research, outcrop analysis, three-dimensional seismic interpretation, and physical modeling; this is based on dynamics, kinematics, and geometry, as well as different stages, grades, properties, zones, and layers. It elucidates the vertical layering and lateral segmentation characteristics of strike-slip faults, revealing geological laws governing reservoir control, storage, and hydrocarbon accumulation, ultimately leading to the discovery of billion-ton-level mega oilfields in ultra-deep fault-controlled fractured reservoirs. Based on dynamic/static data, the internal configuration of fault-controlled fractured reservoirs is finely delineated, and a quantitative characterization of reservoirs is achieved through the integration of well‒seismic data, facilitating efficient well deployment and reservoir reserve assessment. This approach has supported the discovery and realization of billion-ton-level oil and gas reserves in the rich oilfields. Leveraging the quantitative characterization of fault-controlled reservoirs, targeted strategies to improve recovery rates are proposed, driving the efficient development of 5×106-ton mega oilfields, thereby establishing a paradigm for increasing reserves and production in ultra-deep fault-controlled carbonate reservoirs. This study could serve as a reference for similar oil and gas reservoir development in China.

Keywords

• ultra-deep domain
• internal configuration of fractured reservoirs
• characterization of fault-controlled reservoirs
• efficient well deployment
• increased reserves and production
• Tarim Basin