Shale quality evaluation method based on organic porosity and total organic carbon content
A technology of total organic carbon content and organic porosity, which is used in measurement, earthwork drilling, wellbore/well components, etc., can solve problems such as difficulty in obtaining high production, achieve simple methods, good popularization and application value, and meet the needs of exploration and development. Effect
Active Publication Date: 2020-06-23
中石化石油工程技术服务有限公司 +1
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On the contrary, it is difficult for shale gas horizontal wells to obtain high production
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[0028] refer to figure 1 , the method of the present invention is, concrete steps are as follows:
[0029] 1) Obtain the logging and logging data of the shale to be evaluated in the work area. The data include the shale interpretation interval, lithology, gas logging total hydrocarbon content, methane content, shale organic porosity POR TOC , TOC of shale; TOC, POR TOC The unit of measurement is %.
[0030] Gas measurement of total hydrocarbon content, methane content, shale organic porosity POR TOC , shale total organic carbon content TOC.
[0031] 2) Determine the shale section of the well to be evaluated
[0032] (1) When the logging and logging reservoir interval divisions are consistent, the logging interpretation interval is directly selected as the shale interval; the well parameter to be evaluated is shale organic porosity POR TOC The arithmetic mean value of well logging data is selected, the arithmetic mean value of mud logging measurement results is selected fo...
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The invention relates to an evaluation method for shale quality based on organic porosity and the total content of organic carbon. Logging data of shale of a to-be-evaluated well of a work area is acquired; shale layer section of the to-be-evaluated well is determined; an evaluation criterion of the shale quality is built according to logging data of an actually-drilled well in the work area, the shale total content of organic carbon TOC is taken as the X axis, the shale organic porosity POR<TOC> is taken as the Y axis, a TOC-POR<TOC> evaluating chart is formed, and different symbols are used for labeling the classifications of the shale quality on the evaluating chart; a determined partition criterion of the quality classifications of the work area is drawn on the evaluating chart, and values of the shale organic porosity POR<TOC> and the shale organic carbon TOC of the shale layer section of the to-be-evaluated well are projected on the evaluating chart in a point mode, and corresponding reservoir layer quality classification of the shale layer section of the to-be-evaluated well is judged according to an area of the data points; and an evaluation result is output. According to the evaluation method for the shale quality based on the organic porosity and the total content of the organic carbon, the method is simple and convenient, and applied in Fuling, Yichang areas, and the results meet the needs for evaluation and engineering services.
Description
technical field [0001] The invention relates to the field of unconventional oil and gas reservoir evaluation, in particular to a shale quality evaluation method based on organic porosity and total organic carbon content. Background technique [0002] Shale gas development is a world-class technical problem. With the success of the shale gas revolution in the United States and the commercial development of the Fuling shale gas field in China, the research on shale gas technology has attracted the attention of many scholars at home and abroad. [0003] The practice of Fuling shale gas exploration and development has proved that shale quality is the most direct key factor determining the productivity of shale gas wells. The horizontal sections of shale gas horizontal wells pass through high-quality shale intervals, and shale gas horizontal wells are highly productive. On the contrary, shale gas horizontal wells are difficult to obtain high production. Therefore, fast, effici...
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IPC IPC(8): E21B47/00E21B49/00
CPCE21B47/00E21B49/00
Inventor 张建平廖勇魏炜石文睿叶应贵冯爱国丁文龙赵红燕石元会刘施思
Owner 中石化石油工程技术服务有限公司