Seismic technology combination method for judging and evaluating a strike-slip fault fracture zone of a carbonate rock

Abstract

The invention discloses a seismic technology combination method for judging and evaluating a strike-slip fault fracture zone of a carbonate rock, and aims at overcoming the defect that cracks and fault rocks in a basin are hard to identify and evaluate by the seismic technology due to the fact that the structure of a large carbonate rock fracture zone is diversified. The preferable seismic technology combination is used to identify and evaluate the strike-slip fault fracture zone of the carbonate rock, on the basis of fine interpretation of strike-slip fault and analysis on seismic analysis, the boundary of the fracture zone is judged through response of conventional and prominent discontinuous processing seismic sections, preferably, a navigation ant tracking technology, a filtering coherent data volume technology and a fault automatic pickup technology are combined to judge planar distribution of the fault fracture zone, and an amplitude change rate attribute is combined with the fault automatic pickup technology to zone, segment and partition the fault fracture zone and evaluate the fracture degree. Thus, seismic judging and evaluating of the strike-slip fault fracture zone of the carbonate rock in the deep portion of the basin is realized, and support is provided for structure research and geologic evaluation methods of the fault fracture zone.

Description

technical field [0001] The invention belongs to the evaluation technical field of structural geology and oil and gas exploration and development. More specifically, it relates to seismic identification and evaluation methods for fractured zones of carbonate rocks. Background technique [0002] Large-scale faults often develop a wide deformation zone, and around the narrow fault core where strain and displacement are concentrated, a broad fracture zone affected by faulting often develops (McGrath and Davison, 1995; Kim et al., 2004; Peacock et al. ., 2017). The fault core is the concentrated part of the fault displacement and the distribution area of ​​the fault slip surface (Kim et al., 2004; Peacock et al., 2017). The fracture zone is a deformed rock mass formed around the fault core controlled by the formation, expansion, interaction and accumulation of slip along the fault (Cowie and Scholz, 1992; McGrath and Davison, 1995; Kim et al., 2004; Peacock et al. , 2017). Th...

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Problems solved by technology

[0005] In view of the various structures of large-scale carbonate fracture fracture zones, the difficulty of identifying fractures and fault rocks in the basin by seismic technology, which cannot meet the needs of identification and evaluation of fracture fracture zones, the identification and evaluation of strike-slip fault fracture zones in carbonate rocks are proposed. A seismic technology combination method for evaluation ( figure 1 )

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