Oil reservoir well test curve interpretation method and device for fault-karst carbonate

Abstract

The invention provides an oil reservoir well test curve interpretation method for fault-karst carbonate, which comprises the following steps: acquiring pressure recovery well test data of a target object, performing type analysis on a pressure recovery well test curve, and determining a curve type corresponding to the pressure recovery well test curve; determining a seam / hole combination model to which the target object belongs through the curve type, and performing key parameter adjustment fitting in combination with a pressure recovery well testing curve to obtain key parameters of the target object; and performing inversion based on the key parameters in combination with an inversion formula to obtain application parameters representing reservoir characteristics so as to interpret the reservoir characteristics of the target object. According to the method, type analysis is carried out on the pressure recovery well test curve, fracture / cavity combination model judgment is carried out based on the determined type, fitting and further inversion are carried out according to different fracture / cavity combination models, and application parameters representing reservoir characteristics are obtained. According to the method, the well test curve characteristics generated by the complex fault-karst carbonate reservoir can be effectively known, and schematic guidance is provided for subsequent production and development.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method and device for interpreting well test curves of fault-karst bodies in oil reservoirs. Background technique [0002] Carbonate reservoirs belong to paleokarst fracture-vuggy carbonate reservoirs, with deep burial, many factors controlling reservoir development, strong heterogeneity, and discontinuous spatial distribution of reservoirs. Medium fractures are the main seepage channels, and fluids are mainly stored in caves (Li Yang. Identification and quantitative characterization of Ordovician carbonate cave-type reservoirs in Tahe Oilfield[J]. Journal of China University of Petroleum (Natural Science Edition), 2012, 36(1):1-4.). The fractures connect the caves, and the further transformation of the fractures by dissolution makes it difficult to strictly distinguish the fractures and caves, resulting in very complicated fluid flow patterns in the fracture-ca...

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Problems solved by technology

[0004] The understanding of fracture-cavity reservoirs is mostly based on the research field based on the assumption of multiple media (including dual and triple media models), and then the understanding of well test curve analysis is obtained (Xiong Y, Xiong W, Cai M, et al. well testing for fracture-cave carbonate gas reservoirs[J]. Petroleum, 2016. Yao Jun, Dai Weihua, Wang Zisheng. Research on Well Testing Interpretation Method for Triple Medium Reservoirs with Variable Wellbore Storage[J]. Journal of Petroleum University (Natural Science Edition) , 2004, 28(1):46-51.), there are many correlation analyzes of this kind of well test curves, but it still cannot solve the problem of carbonatite pressure recovery test analysis in actual oilfields

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