Determining method for surveying reserves of hypotonic clastic rock oil-gas reservoir

Abstract

The invention relates to a determining method for surveying the reserves of hypotonic clastic rock oil-gas reservoir positioned on a clastic rock oil (gas) geological reservoir enrichment boundary, comprising the following steps of: carrying out statistical regression on the daily produced oil-gas data and water data of the traditional testing oil well and the traditional testing gas well and thecorresponding physical data, oil-bearing data and electrical data of an oil layer to determine the physical lower limit value, the oil-bearing lower limit value and the electrical lower limit value of an oil-gas layer, which correspond to industrial oil-gas flows; determining the minimum values of output and a sand body thickness according to the relationship between an effective thickness and test oil output and between the sand body thickness and test production; determining the area boundary of the oil-gas reservoir by using a sandrock thickness isoline method and an effective thickness isoline method; and calculating the reserves of the hypotonic clastic rock oil-gas reservoir. The invention solves the problem that the oil-bearing area of the traditional hypotonic clastic rock oil (gas) reservoir is extrapolated depending on artificial well points, is convenient to apply in the calculation of the reserves, can not only be used for more accurately calculating the reserves of oil (gas) reservoir, but also furthest save the exploration discovery workload and reduce the discovery cost of ton reserves, thereby enhancing the economic benefits of oil-gas exploration and development.

Description

technical field [0001] The invention relates to geophysical prospecting and logging technology, and is a method for determining the reserves of low-permeability clastic rock oil and gas reservoirs for investigating the enrichment boundary of clastic rock oil (gas) geological reservoirs. Background technique [0002] There are many methods for calculating oil and gas reserves. Among them, it is very difficult to determine the boundaries of oil (gas) areas. No matter in terms of theoretical understanding or from the perspective of production practice, it is necessary to establish a reasonable low-permeability fracture Calculation methods for clastic oil (gas) reservoir reserves are very necessary. [0003] At present, the calculation of low-permeability clastic rock oil (gas) reservoir reserves is carried out according to the enterprise standard "Calculation Specifications for Oil and Gas Reserves". Among them, the oil (gas) area boundary is determined by the well point extra...

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Problems solved by technology

[0004] In the oil and gas reserve calculation specification, it is predicted that the main sand belt of low-permeability clastic rocks can extend to the place where there is no control of exploration wells, and the oil (gas) area is still determined by artificially specified well point extrapolation method. The main purpose of this artificially specified It is to ensure the accuracy of calculated reserves, but the disadvantage of this method is that the determined oil (gas) area cannot objectively reflect the actual situation, and the calculated reserves sometimes have relatively large errors

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