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Method for recognizing geological sweet spots in shale stratum

A stratum and shale technology, applied in the field of identifying geological sweet spots in gas-bearing shale strata, can solve problems such as small correlation

Active Publication Date: 2016-10-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These reservoir quality parameters include geological sweet spots, but clay content and permeability are less relevant to geological sweet spots and should not be included in geological sweet spots parameters

Method used

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  • Method for recognizing geological sweet spots in shale stratum
  • Method for recognizing geological sweet spots in shale stratum
  • Method for recognizing geological sweet spots in shale stratum

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Embodiment 1

[0050] figure 1A technical idea for identifying geological sweet spots in this embodiment is shown. The ideal identification method of geological sweet spot parameters requires accurate calculation of each geological sweet spot parameter with existing logging methods. The porosity of shale formations is small, and it is difficult to accurately calculate the porosity of shale formations with the conventional three-porosity logging method (sonic wave, neutron and density logging) due to the influence of multi-mineral and organic matter properties instability , NMR logging methods are needed to accurately determine formation porosity and irreducible water content, wherein formation porosity includes movable gas porosity and movable water porosity. The element logging method can effectively judge the complex mineral types and contents of shale formations, and obtain mineral content, which is beneficial to determine other geological sweet spot parameters of shale formations, and a...

Embodiment 2

[0098] In this embodiment, the logging data of a well in a shale formation in a block in southwest China is used as an example to illustrate the identification results of geological sweet spots.

[0099] The high-quality shale lithology in this block is mainly composed of yellow-gray shale and silty shale interbedded with thin lenticular limestone. The total organic matter content of this well is 4%, the gas porosity is 2%, and the kerogen content is 1%, the gas saturation is 70%, and the regional maximum values ​​of these four parameters are: 8%, 6%, 6%, and 100%.

[0100] These four parameters are normalized, and the normalized geological sweet spot parameters are: the total organic matter content is 4 % 8 % = 0.5 , The air porosity is 2 % 6 % ...

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Abstract

The invention discloses a method for recognizing geological sweet spots in a shale stratum. The method includes the following steps that the kerogen volume content, the gas-bearing porosity and the water-filled porosity in the shale stratum are determined according to logging information; the gas saturation is determined according to the water-filled porosity and the gas-bearing porosity of the shale stratum; the total organic content is determined according to sound wave and resistivity logging information and the organic matter maturity; and according to the kerogen volume content, the gas-bearing porosity, the gas saturation and the total organic content of the shale stratum, the geological sweet spot coefficient of the shale stratum is determined through a radar map analyzing method, and the geological sweet spot coefficient is used for recognizing the geological sweet spots in the shale stratum. According to the method, the geological sweet spots in the shale stratum are represented through the four parameters of the organic content, the kerogen volume content, the gas-bearing porosity and the gas saturation, recognition completeness of the geological sweet spots in the shale stratum is fully considered, the quality of the geological sweet spots in the shale stratum is quantitatively represented through the geological sweet spot coefficient, and quantitative reference is provided for mining engineering of the shale stratum.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for identifying geological sweet spots in gas-bearing shale formations. Background technique [0002] The sweet spot in the shale formation refers to the part of the formation that has good reservoir geological quality and is relatively easy to perform fracturing engineering. The sweet spot is very important to the development of shale formations. Finding the sweet spot is conducive to reducing the cost of shale exploration and development and increasing the productivity of gas-bearing shale formations. [0003] The term "sweet spot" first appeared in relation to difficult-to-develop reservoirs, and refers to a small fault block in conventional oil and gas layers with good reservoir quality. It was subsequently used in coalbed methane, where sweet spots are high potential gas producing areas with better natural fractures and coal seam thickness, and highe...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 廖东良曾义金张元春
Owner CHINA PETROLEUM & CHEM CORP
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