Method for Estimating Effective Volume of Carbonate Cave Reservoir

Abstract

The invention discloses a carbonate rocks cave-type reservoir active volume estimation method. The active porosity and the active volume of a cave layer as well as a projection area of the cave layer on the top surface of the reservoir can be determined only by virtue of drilling engineering parameters, earth physical logging data and earth physical exploitation earthquake transmission wave attribute parameters, the active volume of the cave layer reservoir can be further solved. By adopting the method, the defect of the uncertainty for calculating the method by utilizing a static method can be effectively improved, and reasonable evidence is provided for reasonably estimating the geological reserves of the carbonate rocks cave-type oil-gas reservoir and establishing an exploitation development deployment scheme.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to a method for estimating the effective volume of carbonate rock cavern reservoirs. Background technique [0002] Carbonate oil reservoirs occupy an important position in the world's discovered oil reservoirs. Among the 256 large oil fields in the world, 115 are carbonate oil fields, accounting for 45%. 50% and 65% of the world's total, it has always occupied an important position in oilfield development and has a long history of development. Foreign carbonate reservoirs are mainly distributed in the Middle East and the Americas, with various oil and gas enrichments, such as large uplifts, reefs, and buried hills. [0003] Since the 1970s, my country has successively discovered and developed some carbonate reservoirs in Shengli, Huabei, Tahe and other oilfields. Through years of development practice and research, many theories and applied technologi...

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Problems solved by technology

[0004] The development practice of Tahe Oilfield shows that the fractured-cavity reservoirs of carbonate rocks are the result of multi-stage karst transformation, and the reservoir spaces mainly include caves, pores, fractures, etc., and the combination of these reservoir spaces with obviously different characteristics forms caves type, fracture-cavity type, fracture type, and cave type reservoirs, the boundary shape of which is distributed in three-dimensional space is extremely irregular; the distribution of reservoir space is discontinuous, the porosity changes greatly, the regularity is poor, and the heterogeneity is very serious; Analyzing the reaction, the porosity of rocks with poor physical properties is about 1%, and the storage capacity is very poor, while some of the caves revealed by drilling and emptying are large-scale empty caves (zero when drilling); and complex reservoir shapes and reservoirs The huge difference in the physical properties of the internal reservoirs makes the distribution of oil and water very complicated; the uncertainty of the reserve calculation parameters of the static method is large, and the reserves calculation parameters of the clastic rock reservoirs are simply applied to determine the reserves calculation parameters of the fracture-vuggy reservoirs There is obvious incompatibility, and there is no mature reserve calculation method for this type of reservoir at home and abroad

[0005] The storage space of cave-type reservoirs is large caves (and fractures). Caves (including large caves and giant caves) have huge storage spaces. In addition, fractures can communicate with caves and improve seepage performance, resulting in huge storage spaces and seepage storage capacity. Therefore, the calculation of the effective volume of cave-type reservoir storage space is of great significance for determining the reserves of carbonate fracture-cavity reservoirs. Calculation method of effective volume of type reservoir

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