Abstract
The fractured granite basement is the primary oil and gas reservoir in the Cuu Long Basin, Vietnam. Due to the complexity of this nonlayered unconventional target, combined with complicated fault and fracture systems, the seismic data quality near and within the basement section is very low. For this reason, it is important to apply improved seismic data processing workflows, filtering and migration techniques, as wells as attribute processing methods to enhance the imaging quality. Our studies show that applying different types of filters, including the f-k, Radon transform and Tau-P, improves signal to noise ratio, removing multiples, revealing basement’s top and its related fractured and fault zones. In addition, the application of multi-arrival-solution migration algorithms, such as Kirchhoff Migration and Controlled Beam Migration, provides improved imaging for identifying basement top and faults and fractures within the basement. Furthermore, the application of seismic attributes such as curvature, apparent dip, or energy gradient, is important in locating faults and fractures, whereas mapping of intensity and orientation of such structures assists the delineation of “sweet spots” and assists the planning of exploration.
Highlights
IntroductionThe basement rocks were exposed to weathering before subsidence and covered by Cenozoic sedimentary units during the crustal rifting and basin formation processes
The Cuu Long Basin is one of major Cenozoic marginal sedimentary basins of the continental shelf of Vietnam
This paper describes the results of those processing sequences of a seismic dataset from Cuu Long Basin to reveal the sub-unconformity, structural complex basement architectures
Summary
The basement rocks were exposed to weathering before subsidence and covered by Cenozoic sedimentary units during the crustal rifting and basin formation processes. These processes created local significant structural variability such as horst and grabens, a network of fractures with sufficient pore space and permeability within the basement complexes. All of these features have contributed to the formation of a unique type of hydrocarbon reservoirs within the basement granitic rocks of the Cuu Long Basin, which became primary targets for oil and gas exploration in Vietnam
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
