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Method for gradually recognizing oil layer and water layer in low-permeability complex lithologic oil deposit

A technology of complex lithology, oil and water layers, applied in the field of exploration

Inactive Publication Date: 2015-05-20
NORTHWEST UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it is necessary to pay attention not only to the effective extraction of geological information of single logging signals, but also to the comprehensive analysis of logging multi-information under the constraints of geological conditions. Analyzing, and constructing an effective method based on formation water salinity, acoustic time difference, resistivity, natural gamma ray logging parameters and their comprehensive parameters, gradually identifying oil layers and water layers from easy to difficult, can effectively solve the problem of low-permeability complex rock In the complex situation of conventional oil layers, conventional water layers, low-resistivity oil layers, high-resistivity water layers, dry layers, etc. in complex oil reservoirs, it is difficult to identify oil layers and water layers, and the coincidence rate of oil layers and water layers in logging interpretation is significantly improved

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  • Method for gradually recognizing oil layer and water layer in low-permeability complex lithologic oil deposit
  • Method for gradually recognizing oil layer and water layer in low-permeability complex lithologic oil deposit
  • Method for gradually recognizing oil layer and water layer in low-permeability complex lithologic oil deposit

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Embodiment 1

[0047] Take the Chang 9-2 oil layer group of Yanchang Formation in an oil area in the central part of the Ordos Basin (No. 7 area), that is, Chang 9-2 in Area 7, as a low-permeability and complex lithological oil reservoir:

[0048] According to the statistics of the actual data of the 7 district chief 9-2: oil layers, 2; oil and water layers, 12; oil-bearing water layers, 1; water layers, 28; dry layers, 4; total: 47.

[0049] The method of gradually identifying oil and water layers in low-permeability complex lithological reservoirs is as follows:

[0050] Step 1: First, drill the low-permeability and complex lithology reservoir with drilling equipment, and use logging tools to obtain the sonic time difference parameters, resistivity parameters, and nature reflecting the influence of lithology in the low-permeability complex lithology reservoir. Gamma parameters, the obtained low-permeability complex lithological reservoir sonic time difference parameters and resistivity parameters...

Embodiment 2

[0065] Take the Chang 4-5 oil layer group of the Yanchang Formation in an oil area in the central part of the Ordos Basin (No. 10 area), that is, Chang 4-5 in Area 10 as a low-permeability and complex lithological oil reservoir:

[0066] According to the statistics of actual data from the chiefs of District 10 4-5: oil layers, 9; water-bearing oil layers, 4; oil-water layers, 16; oil-bearing water layers, 2; water layers, 46; total: 77.

[0067] The method of gradually identifying oil and water layers in low-permeability complex lithological reservoirs is as follows:

[0068] Step 1: First, drill the low-permeability and complex lithology reservoir with drilling equipment, and use logging tools to obtain the sonic time difference parameters, resistivity parameters, and nature reflecting the influence of lithology in the low-permeability complex lithology reservoir. Gamma parameters, the obtained low-permeability complex lithology reservoir sonic time difference parameters and resisti...

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Abstract

The invention provides a method for gradually recognizing an oil layer and a water layer in a low-permeability complex lithologic oil deposit. The method includes the steps of carrying out fine and effective extraction on single well-logging signal geological information, carrying out multi-signal comprehensive analysis when geological conditions constrain the well-logging, and effectively and gradually recognizing fluid properties based on formation water salinity, interval transit time, resistivity, natural gamma and comprehensive parameters thereof. The method can effectively solves the problems that the oil layer and the water layer are difficult to recognize on the conditions that a conventional water layer, a conventional oil layer, a low-resistivity oil layer, a high-resistivity water layer, a dry layer and the like coexist in the complex lithologic oil deposit of an oil region with changeable formation water salinity, and can obviously improve well-logging interpretation coincidence rate. The actual application of the technology in an oil field proves that the interpretation coincidence rate of the oil layer and the water layer can usually be improved to above the minimum 88.1% from insufficient 60.0%.

Description

technical field [0001] The present invention belongs to the field of exploration geophysics, specifically belongs to the branch field of logging method technology, and is a method for gradually identifying oil layers and water layers in low-permeability complex lithology reservoirs, that is, a method based on formation water salinity, acoustic time difference, Resistivity and its comprehensive parameters are combined with natural gamma parameters reflecting lithology to compile a crossplot, and then quickly and efficiently identify the oil layer and water layer in low-permeability complex lithology oil reservoirs with variable formation water salinity. method. Background technique [0002] With the continuous improvement of exploration and development, the complexity of geological targets and the difficulty of logging interpretation are also increasing, such as complex lithology high natural gamma ray sandstone, complex pore structure reservoir double-porosity medium reservo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01V11/00
Inventor 张小莉王香增程玉群张丽霞申怡博曹金舟张涛王震亮段昕婷黄薇
Owner NORTHWEST UNIV