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Method for identifying fluid type of reservoir with complicated pore structure by using conventional logging information

A technology with complex pore structure and conventional logging data, which can be used in earth-moving drilling, wellbore/well components, etc. It can solve problems such as inapplicability and inability to solve, and achieve the effect of reducing investment and improving exploration effect.

Active Publication Date: 2014-02-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the existing technologies represented by the above three patent documents require nuclear magnetic resonance logging data to reflect the pore structure characteristics of the reservoir. When only conventional logging data (spontaneous potential, natural gamma, compensated In the case of compensation density, compensation sound wave and dual laterolog), the above existing technologies are not applicable, and cannot solve the problem of how to evaluate the high-porosity dry layer and medium-porosity layer with high irreducible water characteristics in the case of conventional logging data. Technical problems of fluid type identification for wells in dry formations, high-resistivity water formations, and high-resistivity gas-water formations

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  • Method for identifying fluid type of reservoir with complicated pore structure by using conventional logging information
  • Method for identifying fluid type of reservoir with complicated pore structure by using conventional logging information
  • Method for identifying fluid type of reservoir with complicated pore structure by using conventional logging information

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Embodiment 1

[0029] As the most basic embodiment of the present invention, it is based on Figure 5 The process of operation can complete the technology of using conventional logging data to identify the reservoir fluid type with complex pore structure. The specific method is as follows:

[0030] Step 1: Distinguish air layers and non-air layers (water layer, air-water layer and dry layer) according to the neutron porosity / acoustic (density) ratio.

[0031] Step 2: For non-gas reservoirs, the pore-saturation intersection method is preferred to distinguish effective reservoirs from ineffective reservoirs;

[0032] Step 3: For the effective reservoir, the gas-water layer and the water layer are further distinguished by using the combination of hole-electric intersecting and gas layer mud logging.

Embodiment 2

[0034] As the best implementation mode of the present invention, its application in the method for this kind of reservoir type discrimination represented by the Majiagou Formation is as follows:

[0035] first step: figure 1 It is the neutron porosity / acoustic (density) and acoustic (density) intersection diagram of all gas-test intervals in the Majiagou Formation, from figure 1 It can be seen from the figure that the neutron porosity / acoustic (density) porosity value of wells tested for gas layers is generally less than 1.3; while the values ​​tested for gas-water layers, water layers and dry layers are generally greater than 1.3. For the high-porosity dry layer, it is only the high-reduced water layer that does not produce movable water, which is why the value of the high-porosity dry layer or the low-yield layer (including the low-gas-yield layer) is also greater than 1.3.

[0036] In the second step, for non-gas layers with neutron porosity / acoustic (density) porosity val...

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Abstract

The invention discloses a method for identifying a fluid type of a reservoir with a complicated pore structure by using conventional logging information and relates to the technical field of judgment of the fluid type according to logging information for oil-gas field exploration and development. The method comprises the steps of 1, distinguishing a gas layer from a non-gas layer according to a ratio of the neutron porosity to the acoustic porosity or the density porosity, wherein the non-gas layer comprises a dry layer, a gas-water layer and a water layer; 2, distinguishing an effective reservoir from an ineffective reservoir in the non-gas layer by a pore-full intersection method; and 3, based on the effective reservoir in the second step, comprehensively identifying the fluid type of the reservoir by a pore-power intersection method and gas logging. According to the method disclosed by the invention, the technical problem in evaluation of fluid type identification for a high-porosity dry layer, a middle-porosity dry layer, a high-resistance water layer and a high-resistance gas-water layer well which have high bound water characteristics under the condition that only conventional logging information is provided is effectively solved, and the difficulty in judgment of the reservoir type represented by the Majiagou formation is effectively solved.

Description

[0001] technical field [0002] The invention relates to the technical field of fluid type discrimination of well logging data for exploration and development of oil and gas fields. Background technique [0003] Majiagou in blocks Su 5 and Tao 7 is a set of weathered karst reservoirs. The reservoir storage space is dominated by pores and vugs. The porosity of the reservoir section is mainly between 3 and 7%, and the reservoir thickness is 0.5 to 1.5 m, characterized by low porosity and thin reservoir thickness. Low-porosity reservoirs often have complex pore structures, and the resistivity curve reflects the characteristics of rock structure and pore structure to a greater extent, and is not sensitive to fluid reflection, which brings great difficulties to the identification of fluid properties. [0004] In blocks Su 5 and Tao 7, 41 oil wells were tested in the Majiagou Formation, including 5 gas wells, 15 dry wells, 4 low-yielding gas wells, 9 gas-water wells, and 8 water ...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B49/08
Inventor 赵辉石新韩翀
Owner BC P INC CHINA NAT PETROLEUM CORP
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