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Method for judging types of cemented minerals in sandstone

A cementation and mineral technology, applied in the field of distinguishing the type of cemented minerals in sandstone reservoirs

Pending Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

CN201410106783.1 is mainly to establish a quantitative characterization method of diagenetic logging facies in sandstone reservoirs; CN201410645235.6 provides a method for identifying diagenetic strength and mineral content of the coring section, which does not involve logging technology; the document "early core of sandstone "Imaging logging evidence of carbonate cementation" mainly uses imaging logging information to determine the calcareous cementation degree of sandstone, and does not involve conventional logging techniques and other types of cementing minerals.

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  • Method for judging types of cemented minerals in sandstone
  • Method for judging types of cemented minerals in sandstone

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Embodiment 1

[0035] Example 1 Determination of Cemented Mineral Types in Upper Paleozoic Sandstone Section Reservoirs in a Craton Basin

[0036] (1) Select core samples from the sandstone section in the study area and make thin sections;

[0037] (2) According to geological conditions and geological experience, it is judged that the types of cementing minerals are mainly calcareous cementation and clay cementation, and the data are screened. Judgment criteria are: cementing mineral or clay mineral content > 65%, it is judged as calcareous cementation or clay cementation; calcareous mineral content - clay mineral content > 7%, it is judged as calcareous cementation; clay mineral content - calcareous mineral content > 7%, judged as clay cementation;

[0038] (3) Carry out single-well curve correction and multi-well consistency correction on the well curve of the sampled product, to ensure that the curve value is the true value of the measured formation, and the unified measurement and compa...

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Abstract

A method for judging types of cemented minerals in a sandstone reservoir comprises the following steps: acquiring a rock core sample, and flaking the rock core sample to obtain a rock core sheet; carrying out observation characterization on the rock core sheet to obtain mineral type characteristics of the cementing effect of the rock core sheet; forming a cemented mineral type-logging curve value cross plot by using the cemented mineral type and the logging curve value; according to the obtained cementing mineral type-logging curve value cross plot, analyzing and judging logging curve response characteristics of various cementing substances, and further obtaining a database of the logging curve response characteristics of the various cementing substances; and further acquiring logging parameters of the uncored section sandstone, and judging the cementation substance type according to the cross plot segmentation regions of different cementation types of the cross plot.

Description

technical field [0001] The invention relates to the field of petroleum geology, in particular to a method for discriminating cemented mineral types of sandstone reservoirs. Background technique [0002] Cementation refers to the precipitation of minerals in the voids of clastic sediments, forming authigenic minerals and consolidating the sediments into rocks. The formation of cement can block pores and reduce storage performance. [0003] Cementation generally occurs in the early diagenetic stage (contemporaneous and shallow burial), and the cementing substances formed in different diagenetic stages and in different formation water environments are quite different. The types of cementing minerals formed mainly include carbonate minerals, siliceous rocks, aluminosilicate minerals, zeolite and sulfate minerals. The content and type of cement can reflect the evolution characteristics of reservoir porosity and permeability, as well as the type characteristics of pore water. C...

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Application Information

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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 赵国伟邓模彭金宁曾华盛李龙龙史政
Owner CHINA PETROLEUM & CHEM CORP
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