苏北盆地高邮凹陷阜宁组二段页岩裂缝特征分析

doi:10.13809/j.cnki.cn32-1825/te.2024.03.011

Abstract

Abstract:

Recent exploration within the second member of Funing Formation（hereinafter referred to as Fu-2 member）in Gaoyou Sag of Subei Basin has marked a significant advancement in the understanding of shale oil potential, highlighting its role in enhancing future reserves and production. This study focuses on Well-X1, utilizing a comprehensive suite of analytical techniques, including imaging logging, core examinations, and micro thin section analysis, to investigate the fracture characteristics across different scales. Additionally, statistical analysis of fracture parameters and isotopic studies of stable carbon and oxygen in fracture fillings provide insights into the formation stages of the fracture. The research delves into the dynamic evolution of fractures and their influence on the accumulation of shale oil and gas. Key findings indicate that structural fractures, predominantly brittle shear and tensile shear fractures, are prevalent and characterized by substantial length and excellent transverse connectivity. Non-structural fractures, including bedding fractures and calcite veins, exhibit some areas of abnormal development. These natural fractures have undergone modifications during later stages, with incompletely filled fractures, pore spaces from dissolved fracture fillers, overpressure bedding fractures, and micro fractures identified as particularly favorable reservoir spaces for shale oil. The results of this study not only shed light on the complex fracture dynamics within the shale but also provide a robust theoretical foundation for evaluating deep shale oil prospects in Gaoyou Sag.

Key words: Gaoyou Sag, Fu-2 member, shale, characteristics of fractures, formation stage

CLC Number:

TE122

SUN Yaxiong,ZHU Xiangyu,QIU Xuming,LIU Qidong,DUAN Hongliang,QIU Yongfeng,GONG Lei. Characteristics of shale fractures in the second member of Funing Formation in Gaoyou Sag of Subei Basin[J].Petroleum Reservoir Evaluation and Development, 2024, 14(3): 414-424.

Figures/Tables 9

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Table 1

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Table 2

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References 25

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分类方案	类型	亚类	特征参数或主要成因	研究方法
裂缝成因	构造裂缝	剪切裂缝	区域构造应力作用下，页岩发生韧性剪切破裂	应力性质
		张剪性裂缝	区域构造应力作用下，页岩发生韧性剪切破裂
		滑脱裂缝	沿页岩层面顺层滑动形成
		构造压溶缝合线	水平挤压作用压溶形成
		垂向载荷裂缝	垂向载荷不均或超出页岩抗压强度
	非构造裂缝	成岩收缩缝	成岩过程中页岩脱水收缩形成	成岩演化
		成岩压溶缝合线	页岩成岩期沉积载荷引起的压溶
		超压裂缝	页岩层内异常高的流体压力
		热收缩裂缝	页岩受侵入岩浆烘烤后冷却收缩破裂
		溶蚀裂缝	页岩差异溶蚀作用
		层理缝	页岩纹层之间的非均质性

编号	裂缝类型	充填物特征	井深/ m	δ¹³C_（VPDB）/‰	δ¹⁸O_（VPDB）/‰	温度/ ℃
1	非构造缝	白云石条带	3 585.71	1.7	-10.5	71.605
2	非构造缝	白云石条带	3 655.28	-0.8	-8.6	61.326
3	非构造缝	顺层方解石脉	3 676.30	1.7	-12.2	80.802
4	非构造缝	顺层方解石脉	3 676.95	1.1	-12.4	81.884
5	非构造缝	顺层方解石脉	3 683.30	1.1	-12.4	81.884
6	非构造缝	顺层方解石脉	3 686.47	-1.2	-10.9	73.769
7	非构造缝	顺层方解石脉	3 689.31	-0.8	-10.5	71.605
8	非构造缝	顺层方解石脉	3 693.62	0.6	-12.3	81.343
9	构造缝	方解石充填	3 696.92	-1.7	-12.8	84.048
10	构造缝	方解石充填	3 700.39	-0.5	-12.8	84.048
11	非构造缝	顺层方解石脉	3 701.40	0.5	-12.2	80.802
12	构造缝	方解石充填	3 704.25	-1.7	-13.1	85.671
13	非构造缝	白云石条带	3 706.42	-3.0	-8.7	61.867
14	构造缝	方解石充填	3 708.40	-2.1	-12.9	84.589
15	构造缝	方解石充填	3 709.60	-2.9	-13.0	85.13
16	构造缝	方解石充填	3 711.00	-1.8	-12.6	82.966
17	构造缝	方解石充填	3 713.20	-3.1	-13.1	85.671
18	构造缝	方解石充填	3 716.55	-3.7	-13.2	86.212
19	非构造缝	白云石条带	3 718.45	-5.2	-8.9	62.949
20	构造缝	方解石充填	3 721.70	-4.8	-11.5	77.015

Characteristics of shale fractures in the second member of Funing Formation in Gaoyou Sag of Subei Basin

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