Determination method for small-scale heterogeneous collective volume

A heterogeneous and reservoir technology, applied in the fields of oil and gas exploration and development, can solve the problems of emptying of drilling tools, difficulty in continuing drilling, inapplicability of volume determination of small-scale heterogeneous reservoirs, etc., and achieve reasonable calculation results and accuracy, reducing the effect of contradiction

Active Publication Date: 2013-05-22
BC P INC CHINA NAT PETROLEUM CORP +1
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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 con...

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  • Determination method for small-scale heterogeneous collective volume
  • Determination method for small-scale heterogeneous collective volume
  • Determination method for small-scale heterogeneous collective volume

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Embodiment Construction

[0067] The present invention will be described in detail below in conjunction with examples. The difference between the present invention and the traditional volume method is that: 1) the porosity body in the depth domain is used as the basic data body for volume calculation; 2) the fracture-cavity body is determined by setting the porosity threshold value and reservoir engraving, and is calculated by point-by-point volume integral The "apparent volume" of the earthquake; after the volume correction scale is obtained through the forward modeling of the model, the geological "true volume" is obtained after the seismic volume is corrected according to the scale. Its implementation process is as follows figure 1 . Taking the fractured-cavity carbonate reservoir in the basin as an example, the basic characteristics of the reservoir are small volume and strong heterogeneity. The response on the seismic section is a beaded reflection, and it appears as a spot on the amplitude plane...

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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...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 杨平刘永雷但光箭安海亭李海银
Owner BC P INC CHINA NAT PETROLEUM CORP
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