鄂尔多斯盆地安塞地区页岩油地质-工程一体化技术实践

doi:10.11743/ogg20220518

Abstract

Abstract:

Shale oil is a hot spot for petroleum exploration and development over the world. Given its unique geological features， enrichment mechanisms， and development conditions， shale oil is desirable for an integration of geology and reservoir engineering. A variety of technical methods such as field geological survey， core observation and sampling， logging data interpretation， geological and engineering parameter analysis and testing， are applied to geological evaluation of shale oil with focuses on reservoir lithology， thickness， porosity， permeability， oil saturation， fracture development and selection of sweet spots； while in terms of reservoir engineering evaluation， we propose a development method and parameters appropriate to the shale oil in Ansai area regarding the geological characteristics of sweet spots. The main understandings obtained are as follows. First， the 7^th member of the Triassic Yanchang Formation （Chang 7 Member） in Ansai area， Ordos Basin is typical of continental shale oil mainly of delta front and semi-deep lacustrine subfacies. The tight sandstones therein mainly belong to reservoirs with low to ultra-low porosity and ultra-low permeability or non-reservoirs. In light of geological and geomechanical parameters， the reservoirs can be classified into 4 types from good to poor， including Type Ⅰ， Type Ⅱ， Type Ⅲ and Type Ⅳ， with the first two types being targets of sweet spots. Second， the flow of shale oil in reservoirs of the Chang 7 Member are driven by reservoir fluid， rocks'elastic expansion and gas dissolution， while the potential of energy supplement via gas injection is limited. For Type Ⅰ reservoirs selected by geological evaluation， the nine-point， seven-point or staggered horizontal well patterns are used for quasi-natural depletion， while the seven-point or five-point horizontal well patterns are used for development of Type Ⅱ reservoirs. Third， the typical horizontal wells in the Chang 7 Member is of low initial production with a high decline rate at the initial stage， but the decline rate gradually reduces in the later stages. Moreover， it features a long production cycle with a relatively stable production.

Key words: production, horizontal well, geology-reservoir engineering integration, tight sandstone, shale oil, Chang 7 Member, Ansai area, Ordos Basin

CLC Number:

TE357

Chenglin Liu, Xinju Liu, Hongjun Zhang, Liyong Fan, Xiya Yang, Qibiao Zang, Bo Dai, Yue Meng, Hongliang Huo, Fang Wang. Application of an integrated geology-reservoir engineering approach to shale oil development in Ansai area， Ordos Basin[J]. Oil & Gas Geology, 2022, 43(5): 1238-1248.

Figures/Tables 8

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Table 1

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Table 2

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参数	Ⅰ类/最有利	Ⅱ类/有利	Ⅲ类/较有利	Ⅳ类/一般
含油厚度/m	≥8	5～<8	2～<5	<2
孔隙度/%	≥8	6～<8	4～<6	<4
渗透率/（10^-3 μm²）	≥0.3	0.2～<0.3	0.1～<0.2	<0.1
含油饱和度/%	≥40	35～<40	30～<35	<30
矿物脆性指数/%	≥47	46～<47	44～<46	<44
力学脆性指数/%	≥35	34～<35	33～<34	<33

参数		交错排状准自然能量井网	五点法水平井网	七点法水平井网	九点法水平井网
井网参数	水平段长度/m	600～1 200	400～700	600～800	800～1 200
	注水井距/m	400～600	400～500	600～800	600～800
	排距/m	300	100～150	350～500	300～500
	井网密度/（口·km^-2）	<1	<1	<1	<1
	井排方向	垂直于裂缝走向	垂直于裂缝走向	垂直于裂缝走向	垂直于裂缝走向
注采参数	注水时机	同步或滞后1个月	同步	同步	同步或超前
	注水强度/（m³·d^-1·m^-1）	1.4～2.3	1.4～2.3	1.4～2.3	1.4～2.3
	注入量和单井配注量/（m³·d^-1）	10～20	15～20	15～20	20～30
压力参数	采油井井底流压/MPa	5～9	5～9	5～9	5～9
	注水井井底流压/MPa	20～33	20～33	20～33	20～33
	地层破裂压力/MPa	35～50	35～50	35～50	35～50
	最大注入压力/MPa	14～20	14～20	14～20	14～20
单井参数	单井产能/（t·d^-1）	10～50	10～50	10～50	10～50
单井参数	采收率/%	20～40	20～40	20～40	20～40

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Application of an integrated geology-reservoir engineering approach to shale oil development in Ansai area， Ordos Basin

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