页岩气水平井TOC测井评价新方法

doi:10.11720/wtyht.2021.1181

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Abstract

Due to the lack of layer, the constant change in borehole formation, the fewer logging curves in key intervals, the complex borehole environment, the complex relationship between logging response and reservoir parameters and some other factors, the logging interpretation of horizontal well in shale gas is difficult. Aimed at tackling this problem, the authors adopted the evaluation technique flow of "Formation method of horizontal well logging-Analysis of response differences between horizontal wells and between horizontal and vertical wells-Correction of horizontal well curves-Parameter evaluation method based on vertical wells" to evaluate TOC in shale gas for horizontal wells. In the logging evaluation, in view of the complex response law, the histogram method is used to analyze the logging response law and, in consideration of the fact that there are fewer logging curves for horizontal wells in the logging evaluation, a dual information fusion method is proposed based on combination with curve overlap method so as to comprehensively utilize the logging curve information. The results show that this method can correct horizontal well logging curves based on fully analyzing the logging response differences, and the dual information fusion method has the advantages of full use of logging information, high accuracy of evaluation method and simple operation.

Key words： shale gas the logging response difference the correction of logging curves in horizontal well TOC dual information fusion

Received: 16 April 2020 Published: 29 April 2021

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Corresponding Authors: ZHANG Chao-Mo E-mail: lwn1995@126.com;zhang7801@263.net

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	Articles by authors
	Wei-Nan LIU
	Chao-Mo ZHANG
	Lin-Qi ZHU
	Song HU
	Zheng KONG
	Rui DENG

Cite this article:

Wei-Nan LIU,Chao-Mo ZHANG,Lin-Qi ZHU, et al. A new method for TOC logging evaluation in shale gas for horizontal well[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 423-431.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1181 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/423

The flow chart of new method for evaluating horizontal well parameters in Y area

The contact relationship between borehole trajectory and formation of horizontal well Y3

The logging response histogram of whole horizontal wells in Y area

The logging response histogram of upper edge of peak I for horizontal wells in Y area

The depth of upper edge of peak I in horizontal well section of Y area

The logging response histogram of vertical well and horizontal well in upper edge of peak I of Y3

Response values for upper edge of peak I of horizontal and vertical wells in Y3

Statistical for correction of logging response of horizontal well Y3

TOC computing model of Y area

TOC prediction results of vertical well Y3

Error statistics of TOC of vertical well in Y area

Histogram of TOC calculation results for vertical and horizontal wells in Y area

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