Determination method for small-scale heterogeneous collective volume

Abstract

The invention discloses a determination method for small-scale heterogeneous collective volume in oil and gas exploration. A time-domain seismic data body is inverted to obtain a wave impedance data body, the wave impedance data body is converted into a porosity data body, time-depth conversion is carried out on the porosity data body to obtain a depth-domain porosity body, the depth-domain porosity is carved to obtain a seam hole body which is placed at a position where only effective reservoir is kept, and volume integral is carried out on the seam hole body to obtain apparent volume. A model is forward modeled to obtain a work area volume correcting value edition, the apparent volume is rectified to obtain true volume, and total accumulating scale is obtained by accumulating true volume of all seam hole bodies in a work area. Compared with a traditional method, the determination method for the small-scale heterogeneous collective volume is reasonable and accurate. The determination method for the small-scale heterogeneous collective volume can provide an important basis for well placement decisions, calculation of reserves and development program design, well position is enabled to be conformed to real geological conditions, and therefore contradictions between the program design and production reality are reduced.

Description

technical field [0001] The invention relates to petroleum and natural gas exploration and development technology, in particular to a method for determining the volume of small-scale heterogeneous reservoirs for reservoir reserves, performance evaluation and drilling decision-making. Background technique [0002] In the exploration and development of oil and natural gas, the places where oil and gas can be accumulated and preserved are called traps. A trap usually consists of two parts: one part is a reservoir rich in pore space that can accommodate oil and gas (referred to as reservoir); the other part is a relatively tight sealing layer that can prevent oil and gas from escaping from the top, side or bottom , including cover, section, bottom plate, etc. Among them, the parameter that determines the maximum oil and gas scale of the trap is the size of the trap pore space, that is, the volume of the trap; it is one of the most important parameters required for the calculatio...

AI Technical Summary

Problems solved by technology

There are also similar problems in the calculation of reservoir thickness: when drilling into large caves, the phenomenon of drilling tools emptying and mud leakage often occurs, making it difficult to continue drilling in engineering and having to stop drilling

[0022] It can be seen that the traditional volume calculation method is not applicable to the volume determination of small-scale heterogeneous reservoirs

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