Shale gas dessert evaluation method based on gaseous carbon isotope

A carbon isotope and evaluation method technology, which is applied in earthwork drilling, measurement, wellbore/well components, etc., can solve the problems of delayed exploration progress, long time, large manpower and financial resources, etc., to shorten the sweet spot evaluation cycle and reduce the exploration cost. Cost, the effect of improving exploration efficiency

Active Publication Date: 2020-09-04
苏州冠德能源科技有限公司
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Problems solved by technology

Both experimental testing and well logging analysis are post-drilling evaluation techniques, consisting of a series of evaluation parameters, which not only consume a lot of manpower and financial resources, but also take a long time (delaying the exploration progress).
More importantly, the above techniques ignore the geological information contained in the shale gas itself.

Method used

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  • Shale gas dessert evaluation method based on gaseous carbon isotope
  • Shale gas dessert evaluation method based on gaseous carbon isotope
  • Shale gas dessert evaluation method based on gaseous carbon isotope

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Embodiment Construction

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0025] Taking a Longmaxi shale gas well in the eastern part of the Sichuan Basin as an example, the implementation process of the shale gas sweet spot evaluation method based on gas carbon isotope is described in detail. The specific steps are as follows.

[0026] (1) Obtaining gas carbon isotope composition data while drilling

[0027] The gas carbon isotope composition data obtained while drilling comes from mud gas and cuttings tank top gas. The mud gas refers to the gas released from the circulation of drilling mud to the mu...

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Abstract

The invention discloses a shale gas dessert evaluation method based on gaseous carbon isotope. The method comprises the steps that gaseous carbon isotope composition data are obtained in a while-drilling manner; geologic logging data are collected; the gaseous carbon isotope composition data and the geologic logging data draw a composite profile; and in combination with geological parameters, according to gaseous carbon isotope composition parameters, the dessert interval is divided. Through the above manner, the method can be implemented after a straight well is completed, the dessert evaluation period can be effectively shortened, and the oil and gas exploration efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a method for evaluating shale gas sweet spots based on gas carbon isotope. Background technique [0002] Currently, shale gas sweet spot evaluation research is mainly based on data from two aspects: drilling and logging technology and rock test analysis. Based on experimental test analysis and research, the main parameters for evaluating the shale gas sweet spot of the Lower Silurian Longmaxi Formation in southern my country include total organic carbon, brittle mineral content, porosity and formation pressure. Shale gas sweet spots are classified according to the indicators of high total organic carbon value, high gas content, high porosity, high formation pressure and bedding development, and natural micro-fracture development (ie "four high and two development"). The corresponding logging sequence is natural gamma, sonic time differenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/11E21B47/12
CPCE21B49/00E21B47/12
Inventor 仰云峰林远李行徐志尧张焕旭朱地
Owner 苏州冠德能源科技有限公司
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