Method and system for calculating activity intensity and activity rate of fault

Abstract

The invention discloses a method and a system for calculating the activity intensity and the activity rate of a fault. The method comprises the following steps: collecting a fault profile map; measuring and recording an included angle between the two-dimensional profile and the fault trend, and selecting a profile; carrying out numeralization processing on a stratigraphic line and a fault line of the profile; recovering the geological profile of each geological period based on a balanced geological profile technology; counting the visual vertical fault displacement, the visual transverse fault displacement and the visual slip distance of the fault in each geological period; respectively calculating the true vertical fault displacement, the true transverse fault displacement and the true slip of the fault in each geological period; calculating to obtain fault activity intensity in each geological period; according to the method, the activity direction of the fault can be identified in the process of calculating the activity intensity and the activity rate of the fault, the method has wide applicability, the calculation method is simple, and the calculation result is more accurate compared with the prior art; powerful data support can be provided for researching the activity condition of the fault geology in the historical period.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and system for calculating fault activity intensity and activity rate. Background technique [0002] Fault activity analysis is to study the activity of faults during the geological historical period. The activity of faults is of great significance to the study of the formation of hydrocarbon traps, historical migration and leakage of oil and gas, and the opening and closing of faults. Under the geological background of compression or tension in the basin, when the stress of the stratum exceeds the fracture strength of the rock, the stratum will undergo a certain amount of displacement, thereby forming a fault. Due to the diverse activity patterns of faults, some faults are continuously active during the formation of the basin, some are intermittently active and discontinuous, and some are caused by multiple secondary faults growing through the geological...

AI Technical Summary

Problems solved by technology

[0003] At present, in the existing technology, many analyzes have been carried out on fault activity, and the main methods used are: Paleodrop method (Zhao Yong, Dai Junsheng. Application of drop analysis to study growth faults[J]. Petroleum Exploration and Development, 2003 ,30(3):2-10), fault activity rate method (Li Qinying, Luo Fengzhi. Research method and application of fault activity rate[J]. Fault Block Oil and Gas Field, 2000,7(2):15-17), slip distance Method (Xu Kaili, Zhu Zhicheng. Structural Geology [M]. Beijing: Geological Press, 1984: 125-126), breakpoint moving method (Zhang Jinning, Zhang Jingong, Wu Chunyan, etc. Geometry of the Alar fault in the Qaidam Basin, movement fault growth index [D]. Shu Xiang, Chen Song, et al. A method for calculating the intensity of fault activity and its application[J]. Natural Gas Geoscience, 2010, 21(4):612-616). It is well described, but there are also some defects: (1) Since these analysis methods are basically based on the current two-dimensional seismic or structural sections, the compaction of strata in the geological history period has not been fully considered; (2) the geological (3) In the study of fault slip distance, the section is basically regarded as a straight line, but the actual natural section is mostly a curved surface, especially the section of a thrust fault; (4) Identify the direction of fault activity in the geological history period, and whether the fault has reversed in the geological history period

These problems are difficult to solve with the current research methods, which brings great difficulties to the quantitative calculation of fault activity intensity and rate

Images