大吉区块深部(层)煤层气储层地应力测井预测研究

doi:10.11720/wtyht.2024.2600

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Abstract

For deep coalbed methane (CBM) exploration and production, accurate in situ stress prediction holds critical significance for safe and efficient drilling and completion of wells. Deep CBM reservoirs, once considered restricted areas for exploration and exploitation, have been highly anticipated owing to their high yields in recent years. However, their in situ stress prediction model has not been investigated effectively. Hence, this study systematically analyzed six in situ stress prediction models commonly used for conventional oil and gas reservoirs and unconventional gas (like CBM) reservoirs. Based on these prediction models, this study calculated the in situ stress, and found that the combined spring model and the Newberry model yielded relatively high accuracy through comparative analysis of closure pressures. To improve the accuracy of in-situ stress prediction models, the effective stress coefficient of coal rocks was employed to optimize the two models. The optimized in-situ stress models yielded prediction accuracy errors reduced by 4%, roughly meeting the requirements of in-situ stress prediction accuracy for deep CBM exploration and production in the Daji block.

Key words： deep coalbed in situ stress applicability analysis combined spring model Newberry model

Received: 09 December 2022 Published: 16 April 2024

ZTFLH:

P631

Corresponding Authors: LIU Zhi-Di E-mail: 2242706768@qq.com;546759942@qq.com

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	Articles by authors
	Zheng-Long XIE
	Zhi-Di LIU
	Hong-Lai HAN
	Duo WANG
	Cheng-Wang WANG
	Wei WANG
	Liang JI

Cite this article:

Zheng-Long XIE,Zhi-Di LIU,Hong-Lai HAN, et al. Log-based in situ stress prediction of deep coalbed methane reservoirs in the Daji block[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 356-365.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2600 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/356

Comparison of predicted ground stress and measured closure pressure in the deep (seam) coal reservoir of D7-5 well 2 233~2 238 m

Comparison of predicted ground stress and measured closure pressure in the deep (seam) coal reservoir of D40 well 1 865~1 873 m

Fracturing curve of D7-5 well

Fracturing curve of D40 well

Comparison of predicted and measured values of minimum horizontal principal stresses

Horizontal geostress prediction model error analysis

Plate of dynamic-static conversion of Young's modulus of coal rock

Comparison of predicted ground stress and measured closure pressure in the deep (seam) coal reservoir at 2 164.5~2 172.5 m in well H3

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