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Description method suitable for volcanic overflow phase favorable reservoirs

A technology of volcanic rock and overflow facies, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., and can solve problems such as difficulties in identifying reservoirs by electrical parameters

Pending Publication Date: 2020-05-29
中石化石油工程技术服务有限公司 +3
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Problems solved by technology

[0005] In view of this, this application provides a description method suitable for favorable reservoirs of volcanic overflow facies. The method of the present invention can reliably identify favorable reservoirs of volcanic overflow facies, and solve the difficulty of identifying reservoirs by electrical parameters due to the expansion of borehole diameter, etc. The problem

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  • Description method suitable for volcanic overflow phase favorable reservoirs
  • Description method suitable for volcanic overflow phase favorable reservoirs
  • Description method suitable for volcanic overflow phase favorable reservoirs

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Embodiment

[0083] Taking the description of favorable reservoirs of volcanic overflow facies in Chagan Sag as an example, the specific content of the present invention is as follows:

[0084] 1. To divide the favorable facies belt of volcanic overflow facies, the steps are as follows:

[0085] (1) Using electrical and physical property difference characteristics combined with lithological characteristics to divide overflow facies subfacies, and establish overflow facies subfacies model diagram, as shown in figure 1 show, figure 1 Including DL curve, CNL curve, RHOB curve, SP curve, GR curve, and including lithology, resistivity curve, core photo and subfacies. In the upper part, there are Lia facies pores developed, with good physical properties, low electrical density, arc-shaped protrusions, and peak-shaped and irregular tooth-shaped high value of the acoustic time difference curve.

[0086] (2) According to the facies model diagram in step (1), the volcanic rocks of different stages...

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Abstract

The invention provides a description method suitable for volcanic overflow phase favorable reservoirs. The method includes the steps that multiple logging drillability parameters A of volcanic regionsare acquired and recognized, and the regions with the small A index values are volcanic overflow phase favorable reservoir zones; the index formula of A is A=lg(3.282 / nt) / lg(0.06847w / d*p); and duringt-pressure balance drilling, min / m, n-rotary disc rotating speed, r / min, w-bit pressure, kN, d-bit diameter, mm, p-drilling fluid density, and g / cm<3>. The logging A indexes are used for recognizingthe volcanic overflow phase favorable reservoirs, and reliability is achieved. The description method further includes the steps that a phase model figure is established through the application of theelectrical and physical difference and in combination with lithologic characters, and volcanic overflow phase favorable phase zones are divided; and by the adoption of the ultramicro and microscopictechnology, high-frequency crack development regions are recognized. The description method provides reliable technical support for optimizing target regions of the volcanic favorable reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and relates to a description method for identification of favorable reservoirs, in particular to a description method suitable for favorable reservoirs of volcanic overflow facies. Background technique [0002] Reservoir description, also known as reservoir description, is mainly based on sedimentology, structural geology and petroleum geology as the theoretical guidance, comprehensively using geological, seismic, logging and other information and applying computer technology to describe the reservoir qualitatively and quantitatively It provides a reliable basis for formulating and optimizing oil exploration and development programs. Among them, the static description of the reservoir is mainly to study the structure of the oilfield, the sedimentary facies and microfacies of the reservoir, the spatial distribution of reservoir parameters, the heterogeneity of the res...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B49/02
CPCE21B49/00E21B49/02
Inventor 王舒李油建张坤贞刘丽真郑玉朝董珊珊
Owner 中石化石油工程技术服务有限公司