页岩油气资源评价基本问题的讨论

doi:10.11743/ogg20220102

Abstract

Abstract:

The potential of shale oil/gas resources has become the focus of social attention. In order to better understand the shale oil/gas resources potential， it is necessary to constantly improve the methodology and strengthen the work of shale oil/gas resources assessment. Shale oil/gas belongs to unconventional resources， the geological characteristics of which are obviously different from those of conventional oil/gas， and the assessment methods for conventional oil and gas resources are thereby not fully applicable. Developing resources assessment method suitable for shale oil/gas is a must. Shale oil and gas resources are usually large-size in place， though with quite low recovery factor. Therefore， the specific resources assessment is supposed to stress both resources in-place and recoverable resources. At present， there are two main basic methods for shale oil/gas resources assessment， namely resource in-place assessment based on shale oil/gas content per unit volume and technically recoverable resource assessment based on shale oil/gas EUR per well. The factors that affect shale oil/gas resources assessment mainly include geological understanding， technology progress and economic factors， with geological evaluation as the foundation and key.

Key words: resources in-place, technically recoverable resources, economically recoverable resources, geological evaluation, resource categorization, assessment methodology, resource assessment, shale oil/gas

CLC Number:

TE155

Qingfan Zhou. Discussion on key issues of shale oil/gas resource assessment[J]. Oil & Gas Geology, 2022, 43(1): 26-33.

Figures/Tables 8

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油气藏类型	常规油气藏	页岩油气藏
分布特征	不连续、独立分布	大面积、连续型分布
与水浮力关系	油气赋存与水的浮力直接相关	油气赋存不直接受水浮力的影响
储层特点	渗透率较高，与源岩不同层	渗透率低，与源岩同层或邻近源岩
赋存状态	游离态、溶解态	游离态、吸附态、溶解态
资源特点	资源量总体规模较小，开采相对容易，采收率较高	资源量总体规模较大，开采难度大，采收率低

盆地	地层组/区带	地质年代	页岩油/致密油采收率/%
威利斯顿	Bakken ND Core	密西西比纪—泥盆纪	8.40
	Bakken ND Ext.	密西西比纪—泥盆纪	7.70
	Bakken MT	密西西比纪—泥盆纪	3.90
	Three Forks ND	泥盆纪	8.20
	Three Forks MT	泥盆纪	3.60
马弗里克	Eagle Ford Play #3A	晚白垩世	8.10
	Eagle Ford Play #3B	晚白垩世	9.00
	Eagle Ford Play #4A	晚白垩世	4.20
	Eagle Ford Play #4B	晚白垩世	5.80
沃斯堡	Barnett Combo?Core	晚白垩世	1.50
沃斯堡	Barnett Combo?Ext.	密西西比纪	1.80
二叠	Del.Avalon/BS （NM）	二叠纪	1.90
	Del.Avalon/BS （TX）	二叠纪	2.10
	Del.Wolfcamp （TX Core）	二叠纪—宾西法尼亚纪	3.40
	Del.Wolfcamp （TX Ext.）	二叠纪—宾西法尼亚纪	1.30
	Del.Wolfcamp （NM Ext.）	二叠纪—宾西法尼亚纪	2.40
	Midl.Wolfcamp Core	二叠纪—宾西法尼亚纪	1.90
	Midl.Wolfcamp Ext.	二叠纪—宾西法尼亚纪	1.60
	Midl.Cline Shale	宾西法尼亚纪	2.80
阿纳达科	CanaWoodford?Oil	晚泥盆世	8.40
	Miss.Lime?Central OK Core	密西西比纪	3.10
	Miss.Lime?Eastern OK Ext.	密西西比纪	0.60
	Miss.Lime?KS Ext.	密西西比纪	1.30
阿巴拉契亚	Utica Shale?Oil	奥陶纪	2.10
D-J	Niobrara Core	晚白垩世	2.10
	Niobrara East Ext.	晚白垩世	1.20
	Niobrara North Ext.#1	晚白垩世	4.60
	Niobrara North Ext.#2	晚白垩世	0.90
	Niobrara North Ext.#2	晚白垩世	0.90

评价方法	优点	缺点
基于页岩油气层含油气量的地质资源量评价方法	适用范围广，也适用勘探开发不成熟的新区；地质资料和科技进步因素易于反映到评价中	不能直接计算可采资源量；因需通过采收率转换，增加了可采资源评价结果的不确定性
基于单井页岩油气EUR的技术可采资源量评价方法	直接计算可采资源量，避免因估算可采系数不确定性的影响；评价结果更符合生产实际	通常需要大量生产数据；没有考虑未来技术进步因素的影响；不能直接用于勘探开发程度低的新区

时间	机构	方法	评价层系	技术可采资源量/ （10¹²ft³）
2011	EIA/ARI	体积法	下寒武统筇竹寺组、	692.0
2011	EIA/ARI	体积法	下志留统龙马溪组	692.0
2013	EIA/ARI	体积法	下寒武统筇竹寺组、	625.9
			下志留统龙马溪组、
			二叠系
2015	USGS	FORSPAN法	下寒武统筇竹寺组、	23.9
			下志留统龙马溪组、
			二叠系龙潭组
2012	国土资源部	体积法	寒武系、志留系、二叠系、三叠系、侏罗系	227.4
2015	国土资源部	体积法	寒武系、志留系、二叠系、三叠系、侏罗系	398.3

页岩区带	FORSPAN				体积法
	技术可采资源量				地质资源量				技术可采资源量
	F95	F50	F5	均值	P95	P50	P5	均值	P95	P50	P5	均值
Woodford	6.06	10.16	17.04	10.68	347.0	148.0	49.5	171.3	34.70	14.80	4.95	17.13
Shublik	0	36.60	72.20	38.40	1186.0	293.0	56.5	413.0	118.60	29.30	5.65	41.30
Brookian	0	2.12	4.37	2.18	117.0	36.0	36.0	43.0	11.70	3.60	3.60	4.30

Discussion on key issues of shale oil/gas resource assessment

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