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Method for determining gas saturation of shale gas reservoir through well-logging lithologic density

A technology of lithology density and saturation, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of large error, low accuracy of gas saturation, and small resistivity of shale gas reservoirs, etc.

Active Publication Date: 2016-02-24
CHINA PETROCHEMICAL CORP +2
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Problems solved by technology

However, conductive minerals such as pyrite often exist in shale gas reservoirs, which makes the resistivity of shale gas reservoirs abnormally small, and the calculated gas saturation has low accuracy and large errors. This method has certain limitations

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  • Method for determining gas saturation of shale gas reservoir through well-logging lithologic density
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  • Method for determining gas saturation of shale gas reservoir through well-logging lithologic density

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Embodiment Construction

[0020] Through shale gas reservoir core experiments, the applicant found that there is an obvious quantitative relationship between the shale gas reservoir core volume density (ρb) and its gas saturation (Sg), and this relationship is expressed as the gas saturation and core volume The reciprocal of the density is positively correlated, and the gas saturation is also linearly related to the core bulk density and the corresponding log natural gamma ray. The log lithology density (DEN) is numerically equal to the core bulk density, but the measurement method is different. Therefore, the above-mentioned quantitative relationship exists between the logging lithology density and the gas saturation of shale gas reservoirs, and the gas saturation (Sg) of shale gas reservoirs can be quantitatively determined by using the logging density and natural gamma ray (GR) data. . Calculation based on core data, use model one Sg=a1 / ρb+b1, calculation model two Sg=a2·ρb+b2·GR+c2; calculation ba...

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Abstract

The invention relates to a method for determining gas saturation of shale gas reservoir through well-logging lithologic density. The method comprises following steps: obtaining gas saturation of core test analyses, core volume and density and well-logging natural gamma at the corresponding depth and utilizing a least square method to determine model coefficients of a first model and a second model in order to ultimately determine an optimal model; acquiring natural gamma and lithologic density of a well to be interpreted, acquiring total hydrocarbon and methane content of the well to be interpreted through gas-logging resources and acquiring lithic fragments, cores, lithology of geological logging to be explained through geological-logging resources; dividing the shale gas reservoir through acquired gas-logging and mud-logging resources; calculating gas saturation Sg of the reservoir of the well to be interpreted through the determined optimal model and well-logging resources; and outputting a calculation result.The method for determining gas saturation of the shale gas reservoir through well-logging lithologic density has following beneficial effects: the method is easy and convenient and is extensively applied and is ready to use in 120 wells of shale gas; and calculated gas saturation of the shale gas reservoir is approximate to gas saturation of the shale gas reservoir, with the average error less than 10%.

Description

technical field [0001] The invention relates to a method for determining the gas saturation of shale gas reservoirs by logging lithology density Background technique [0002] The successful development of shale gas has brought a new energy revolution to the world. The utilization of shale gas is of great significance to environmental protection and energy saving. People pay more and more attention to the search and discovery of shale gas layers. Rock gas has become a new normal in mineral development. Shale gas gas saturation is an indispensable key parameter in the evaluation of shale gas reservoirs, shale gas pools and shale gas area selection. [0003] The traditional method for determining the gas saturation of shale gas reservoirs is to use the ECS element capture logging method or the Archie method to obtain it. At present, ECS element capture logging can only rely on the services of foreign logging companies, and the cost is very high. The Archie method is used to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 张建平冯爱国石文睿赵红燕张占松任元张超谟袁拥军石元会
Owner CHINA PETROCHEMICAL CORP
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