Logging identification method for fine-grain sedimentary rock

An identification method and sedimentary rock technology, applied in the field of petroleum exploration, can solve problems such as affecting the identification accuracy of tight reservoirs, rough identification results, affecting the accuracy of sedimentary microfacies division, etc.

Active Publication Date: 2020-09-04
SHAANXI YANCHANG PETROLEUM GRP
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  • Abstract
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  • Claims
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Problems solved by technology

The identification results are very rough, which not only affects the accuracy of tight reservoir identification, but also affects the accuracy of sedimentary microfacies division

Method used

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  • Logging identification method for fine-grain sedimentary rock
  • Logging identification method for fine-grain sedimentary rock
  • Logging identification method for fine-grain sedimentary rock

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Experimental program
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Effect test

Embodiment 1

[0035] A logging identification method for fine-grained sedimentary rocks, the logging identification method is as follows:

[0036] (1) Calculate the characteristic parameters TOC, Si, Clay and Y by using the logging data. The specific calculation method is as follows:

[0037] (1) Calculate the quartz feldspar index Si:

[0038] Using logging data, modeling and calculation of Si (quartz feldspar index) of fine-grained sedimentary rocks, using GR (natural gamma ray) and RFOC (eight lateral) as independent variables, and Si (quartz feldspar index) as dependent variables Do regression analysis to get formula 1:

[0039] Si=0.0351GR-5.35287Log (RFOC)+48.2938, linear correlation coefficient R 2 =0.823;

[0040] (2) Calculate the clay mineral index Clay:

[0041] Using CN (neutron) and SP (spontaneous potential) as independent variables and Clay (clay mineral index) as the dependent variable for regression analysis, formula 2 is obtained:

[0042] Clay=0.753CN-85.6568Log(SP)+...

Embodiment 2

[0054] Such as figure 2As shown, Well Y1011 was also located in the sedimentary center of the lake basin during the Chang 7 depositional period, with deep water, far away from provenance, fine-grained sediments, and fine-grained sediments. Taking the section 1750-1760m of Chang 7 as an example, this method is used to explain. 1756-1759m is a typical mudstone in the traditional sense, with high gamma characteristics and easy to identify. 1751-1756m and 1759-1760m are typical fine-grained deposits, with natural gamma values ​​around 100, neither typical sandstone nor typical mudstone, and spontaneous potential curves, acoustic waves, and porosity are almost a straight line; according to regional standards, if identified If identified as sandstone, the entire section is sandstone; if identified as mudstone, the entire section is mudstone. Lithological division is very difficult, which affects the identification of tight reservoirs.

[0055] However, through the method provide...

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Abstract

The invention provides a logging identification method for fine-grain sedimentary rock. According to the method, characteristic parameters including the organic matter content TOC, the quartz feldsparindex Si, the clay mineral index Clay and the sedimentary structure index Y are calculated according to logging data, and the fine-grain sedimentary lithology is identified and determined according to parameter combination of the organic matter content TOC, the quartz feldspar index Si, the clay mineral index Clay and the sedimentary structure index Y. By the aid of the method, the fine-grain sedimentary rock can be described finely by the aid of the logging curve data, and the defect that fine-grain sediment is generally divided into mud stone or sand stone in the traditional methods is avoided; and after the fine-grain sediment is identified finely, classified evaluation can be performed on tight reservoirs, potential and relatively-superior reservoirs in the fine-grain sediment are selected, and the tight oil reservoirs are prevented from being missed to the maximum extent, so that exploration of tight oil is guided.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and in particular relates to a logging identification method for fine-grained sedimentary rocks. Background technique [0002] Conventional crude oil exploration has entered the middle and late stages, and tight oil is the most realistic replacement field for unconventional oil and gas, and has become the focus of oil exploration. The soul of tight oil exploration is the reservoir, and the tight reservoir is mostly composed of "fine-grained matter" (that is, the particle size is less than 62.5 μm, and the composition mainly includes clay, silt and carbonate, etc.), and the lithology includes silty mudstone , argillaceous siltstone, siltstone, siltstone, claystone, etc., have compact lithology and narrow pore throats; and fine-grained sediments are mostly formed in deep water areas far from terrestrial sources, so they basically contain a certain amount of organic matter. The identi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00G06F30/20
CPCE21B49/00E21B47/00G06F30/20
Inventor 葛云锦贺永红马芳侠杜克锋陈义国李红进袁媛张锐
Owner SHAANXI YANCHANG PETROLEUM GRP
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