Method for identifying conglomerate oil layer through resistance reduction rate based on clay type

A technology of reduction rate and resistivity, applied in earthwork drilling, special data processing applications, wellbore/well components, etc., can solve problems such as inaccurate fluid properties, achieve the effect of overcoming limitations and accurate identification results

Pending Publication Date: 2020-11-10
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of inaccurate judgment of fluid properties by using resistivity due to clay c

Method used

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  • Method for identifying conglomerate oil layer through resistance reduction rate based on clay type
  • Method for identifying conglomerate oil layer through resistance reduction rate based on clay type
  • Method for identifying conglomerate oil layer through resistance reduction rate based on clay type

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Embodiment

[0048] Taking the conglomerate oil testing section of 25 wells in the Karamay area as an example, the method for identifying the conglomerate oil layer based on the resistance reduction rate of the clay type of the present invention is used to identify the oil layer. The implementation steps are as follows:

[0049] The first step is to judge the clay type in the reservoir according to the logging characteristic values ​​of chlorite and illite mixed layers;

[0050] Obtain resistivity and density values ​​for conglomerate reservoirs and resistivities for adjacent shale formations;

[0051] The second step is to calculate the resistance reduction rate according to the formula C=RT / Rtclay;

[0052] The third step is to draw the resistance reduction rate-density oil layer identification chart, determine the oil layer standard, and judge the fluid properties of the reservoir.

[0053]The data and calculation results in the embodiment are shown in Table 1. It can be seen from Tabl...

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Abstract

The invention discloses a method for identifying a conglomerate oil layer through resistance reduction rate based on a clay type, and belongs to the field of oil and gas reservoir logging evaluation.The method for identifying the conglomerate oil layer through the resistance reduction rate based on the clay type is characterized in that based on the fact that clay in a reservoir is the same as clay in an adjacent mudstone layer in type, the influence on resistivity of the reservoir and resistivity of the mudstone layer is in the same direction, the resistance reduction rate obtained by dividing the resistivity of the reservoir and the resistivity of the mudstone layer removes the influence of the clay, and based on a resistance increase rate theory of an Archie formula, the porosity is evaluated by combining density logging so that the conglomerate oil layer can be accurately identified. According to the method for identifying the conglomerate oil layer through the resistance reduction rate, the limitation of identifying the conglomerate oil layer by using the resistance increase rate is overcome, the influence of the clay on the reservoir resistivity is effectively eliminated, the conglomerate oil layer can be accurately identified by using the resistance reduction rate in combination with density logging, and the chart application coincidence rate is 100%.

Description

technical field [0001] The invention belongs to the field of well logging evaluation of oil and gas reservoirs, in particular to a method for identifying conglomerate oil layers based on the resistance reduction rate of clay types. Background technique [0002] At present, the identification method of conglomerate fluid properties is mainly based on the Archie formula method based on the resistance increase rate, and the formula is as follows: I=Rt / RO=b / Sw n ; where: Sw is the water saturation of the reservoir, dimensionless; Rt is the resistivity of oil-gas-bearing pure rock, in ohm-meter; RO is the resistivity of water-saturated pure rock, in ohm-meter; b is related to lithology The proportional coefficient of , n is the saturation index, both are dimensionless. [0003] The classic Archie's formula is suitable for pure sandstone with intergranular pores and good porosity and permeability. It has a relatively simple pore size distribution and good pore-throat matching rel...

Claims

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Application Information

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IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 曹志锋蔺敬旗隆山高秋涛王振林张凯黄卫东王先虎姬嘉琦张艳丽王志强陈建穆永利周炬锋张麟安鹏李梅王婷婷
Owner BC P INC CHINA NAT PETROLEUM CORP
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