Method and device for determining weathering index based on rock elements

A weathering index and determination method technology, applied in the direction of chemical property prediction, etc., can solve the problems of discontinuity and untimely weathering index, and achieve the effect of high timeliness, wide application and overcoming low timeliness.

Active Publication Date: 2019-01-22
中石化石油工程技术服务有限公司 +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for determining the weathering index based on rock elements, so as to solve the current problem that the obtained weathering index is not timely and discontin

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  • Method and device for determining weathering index based on rock elements
  • Method and device for determining weathering index based on rock elements
  • Method and device for determining weathering index based on rock elements

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Embodiment Construction

[0038] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] Embodiment of the method for determining the weathering index based on rock elements in the present invention

[0040] The present invention measures the chemical element content in cores and cuttings at different drilling depths at the oil drilling site in the research area to obtain the chemical element content at different depths; the obtained chemical element content at different depths is brought into the element weathering index calculation model to determine different Elemental weathering index for depth. The specific implementation of each step will be described in detail below.

[0041] 1. In the study area, the cores of layers with different degrees of weathering were selected as sampling objects, and the chemical element content and oxidized mineral content of each sampling object were obtained.

[0042] On the basis of reg...

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Abstract

The invention relates to a method and device for determining a weathering index based on rock elements, and belongs to the technical field of rock weathering discrimination. According to the content of oxidized minerals analyzed in a laboratory, a regional constant in a calculation formula for the element weathering index is determined for adjustment, and an optimized element weathering index model is obtained; the element weathering index is calculated according to the rock element content real-timely obtained in a petroleum drilling field. The obtained element weathering index has high timeliness, and the obtained element weathering index can be continuously changed with the well depth, the application is wider, and the problems of low timeliness and discontinuity of the weathering indexobtained in a laboratory are overcome.

Description

technical field [0001] The invention relates to a method and device for determining a weathering index based on rock elements, and belongs to the technical field of rock weathering discrimination. Background technique [0002] Weathering refers to the process of breaking rocks and decomposing unstable minerals under physical, chemical and biological actions, which is of great significance in petroleum geology research. During the weathering process, with the decomposition of unstable minerals, the rock elements are constantly changing. First, the active alkali metal elements (Na, K) and alkaline earth metal elements (Ca, Mg) are dissolved and leached, and then the elements containing P, S, and Si are dissolved and leached. Decomposition of elemental minerals, along with the weathering process, due to the relative loss of other components, relatively stable elements Fe, Al, and Ti are relatively enriched. Therefore, according to the loss and migration characteristics of elem...

Claims

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Application Information

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IPC IPC(8): G16C20/30
Inventor 蒋新立王飞龙杨春文温伟吴天乾马辉左睿贾光亮
Owner 中石化石油工程技术服务有限公司
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