Method and device for determining resource quantity of oil and gas reservoirs in ancient buried hill

Abstract

The embodiment of the invention provides an ancient buried hill oil and gas reservoir resource quantity determination method and device, and belongs to the field of geological exploration of ancient buried mountains. The determination method comprises the following steps: determining a weathering crust of the ancient buried hill; determining a crack cluster in the ancient buried hill; determining a crack, which is consistent with the principal stress direction of the regional stress field of the ancient buried hill, in the crack cluster as a target crack; determining the weathering crust having a contact relationship with the oil source fracture in the weathering crust as an effective weathering crust, and determining the target crack having a contact relationship with the oil source fracture in the target crack as an effective crack; and according to the volumes of the effective weathering crust and the effective crack, determining the resource quantity of the ancient buried hill oil and gas reservoir. Compared with an existing sandstone reservoir volume method, the method has the advantages of being small in error, high in reliability, high in operability and quantitative. Therefore, the method can more effectively evaluate the storage performance and the resource scale point of the ancient buried hill, and has high industrial utilization value.

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