中深层致密砂岩储集层成岩特征与孔隙演化定量研究:以沧东凹陷南皮斜坡孔店组二段为例<sup>*</sup>

doi:10.7605/gdlxb.2023.04.067

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Abstract Diagenesis plays a crucial role in shaping the evolution of reservoir physical properties and ultimately governs reservoir quality. Understanding the relative sequence of diagenesis is of utmost importance for oil and gas exploration. The diagenetic evolution of the Jurassic Yan'an Formation palaeochannel sandstone in the Jiyuan area of the Ordos Basin and its main sources of cements were studied based on core observation,common thin sections,cast(stained)thin sections,scanning electron microscopy(SEM),cathodoluminescence(CL),X-ray diffraction,fluid inclusion and carbon & oxygen isotopes. In addition,the impact of cements and compaction on the loss of intergranular pores was quantitatively analyzed. The results show that paleochannel sandstone reservoir of the Yan'an Formation is mainly composed of arkoses and lithic arkoses,with an average porosity of 15.1% and average permeability of 19.5×10^-3μm²,classifying it as a medium-porosity and low-permeability reservoir. The diagenetic process has experienced compaction,early cementation,medium dissolution,late cementation and late replacement. Among the cements,ferrocalcite exhibits the highest content,while kaolinite is the most widely distributed cement. Cements are the main contributor to the reduction of original intergranular pore volume,accounting for an average contribution of 37.5%,while compaction was the minor contributor with an average contribution of 29.4%. In addition,calcites directly derived from diagenetic fluid related to atmospheric water,whereas dolomite originated from early calcite,coal and mudstone thermal evolution products. Ferrocalcite,on the other hand,primarily originated from thermal evolution of coal and mudstone interlayers. This study establishes a diagenetic sequence for the Jurassic Yan'an Formation palaeochannel sandstone reservoirs in the Jiyuan area,which serves as a fundamental basis for reservoir assessment and provides valuable insights for future exploration and development.

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	Articles by authors
	HAN Guomeng
	LIU Yanxin
	WU Xuesong
	JI Youliang
	MOU Liangang
	YANG Peng
	DUAN Runmei
	YUAN Xuehua
	GUO Qiuxia

Key words： diagenesis diagenetic evolution quantitative calculation of porosity Cangdong sag

Received: 11 January 2022

ZTFLH:

P618.130.2+1

Fund:National Natural Science Foundation of China(No. 42072115): Study on sedimentary configuration and control factors of intermittent braided river alluvial fan under paroxysmal flood conditions

Corresponding Authors: LIU Yanxin,born in 1997,geology Ph.D. candidate of Peking University, and is engaged in sedimentology and reservoir geology. E-mail: redlichi_1997@foxmail.com.

About author: HAN Guomeng,senior engineer,graduated from China University of Petroleum(Beijing)in 1998,and is mainly engaged in comprehensive research on petroleum and natural gas geology. E-mail: hanmguo@petroChina.com.cn.第一作者简介韩国猛,男,<italic>1973</italic>年生,高级工程师,<italic>1998</italic>年毕业于中国石油大学(北京),现主要从事石油天然气地质综合研究工作。<italic>E-mail</italic>: hanmguo@petroChina.com.cn。

Cite this article:

HAN Guomeng,LIU Yanxin,WU Xuesong et al. Quantitative study on diagenetic characteristics and pore evolution of middle-deep tight sandstone reservoirs: a case study of the Second Member of Kongdian Formation in Nanpi slope,Cangdong sag[J]. JOPC, 2023, 25(4): 945-958.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.04.067 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I4/945

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