苏北盆地黄桥地区富CO2流体对油气储-盖系统的改造作用

doi:10.11743/ogg20200604

Abstract

Abstract:

The mechanisms of CO₂-rich fluid in the alteration of reservoir-caprock systems are worthy of study for understanding the links between hydrocarbon accumulation and CO₂ activities, exploring the possibility of geological storage of CO₂ and improving the effectiveness of enhanced oil recovery (EOR) with CO₂ flooding.This study is focused on a comparison of reservoir-caprock systems with and without CO₂ fluid activities in the Longtan and Dalong Formations of the Permian in the Huangqiao and Jurong areas, North Jiangsu Basin, Lower Yangtze region.The results based on thin sections observation, mineral composition and carbon isotope analyses of the areas show that the authigenic minerals in the reservoirs of the Huangqiao area are dominated by secondary overgrowth of quartz and kaolinite, followed by a small amount of dawsonite, whereas those in the Jurong area contain no dawsonite at all and have only limited amount of secondary quartz.The reservoir porosity of the Huangqiao area is markedly higher than that of the Jurong area.Thin section observation reveals a large number of dissolved pores in feldspar occasionally with dawsonite in samples from the Huangqiao area—a piece of direct evidence of interaction between CO₂ and feldspar.Both caprocks in the two areas are black blocky mudstones.There are micro-cracks refilled with calcite veins in the caprocks of the Huangqiao area.And carbon isotope data show that the calcite veins are the result of CO₂-rich fluid activities.While few cracks and mineral veins are discovered in the mudstone caprocks from the Jurong area.These results indicate that the charging of CO₂-rich fluid in the reservoirs caused large-scale dissolution of feldspar, which increased pore space and precipitation of typical authigenic mineral assemblages of dawsonite, secondary quartz and kaolinite.The continuous activities of the CO₂-rich fluid led to precipitation of calcite and subsequent filling-up of cracks and pores in the caprocks, thus providing a better sealing effect.

Key words: alteration, interaction, sealing capacity, reservoir-caprock system, CO₂-rich fluid, Huangqiao area, North Jiangsu Basin

CLC Number:

TE122.2

Bing Zhou, Zhijun Jin, Quanyou Liu, Zengmin Lun, Qingqiang Meng, Dongya Zhu. Alteration of reservoir-caprock systems by using CO₂-rich fluid in the Huangqiao area, North Jiangsu Basin[J]. Oil & Gas Geology, 2020, 41(6): 1151-1161.

Figures/Tables 8

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Table 1

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地区	样品编号	深度/m	自生矿物含量/%
地区	样品编号	深度/m	次生石英加大	高岭石	绢云母	方解石	片钠铝石	白云石	菱铁矿	泥晶碳酸盐	总计
黄桥地区	溪1-10	1 846.6	1.5	0	0	4.0	0	0	0	0	5.5
	溪1-16	1 860.9	1.0	3.0	0	0	0.5	0	0	1.0	5.5
	溪1-17	1 873.4	1.0	1.0	3.0	0	0	0	2.0	0	7.0
	溪1-20	1 875.5	0.5	1.0	1.0	0	0	0	4.0	0	6.5
	溪3-5	1 593.6	4.0	0.5	1.0	0	0.5	0	0	0	6.0
	溪3-7	1 594.9	2.0	1.5	0.5	0	1.5	0.5	1.0	1.0	8.0
	溪3-8	1 596.9	1.5	2.0	0.5	0	1.0	0	1.5	1.0	7.5
	溪3-10	1 597.0	2.0	2.0	1.0	0	0.5	0	1.0	0.5	7.0
	平均值		1.7	1.4	0.9	0.5	0.5	0.1	1.2	0.4	6.6
句容地区	石狮1-5	1 386.2	0.5	2.5	0	0	0	0	1.5	0	4.5
	石狮1-8	1 390.1	0.5	1.0	1.5	0	0	0	1.0	0	4.0
	平均值		0.5	1.8	0.8	0	0	0	1.3	0	4.3

井号	样品编号	深度/m	取样位置	δ¹³C_方解石 (PDB) /‰	^*古地温/℃	^#δ¹³C_CO₂(PDB) / ‰
溪1	X1-AC	1 809.6	泥岩中方解石脉体	0.6	92.9	-4.0
溪1	X1-2C	1 811.0	泥岩中方解石脉体	1.2	93.0	-3.4
溪1	X1-7C	1 818.6	泥岩中方解石脉体	-2.9	93.3	-7.5
溪3	X3-1C	1 538.1	泥岩中方解石脉体	-4.3	82.0	-9.6
溪3	X3-2C	1 539.0	泥岩中方解石脉体	-3.8	82.0	-9.1
溪3	X3-3C	1 543.5	泥岩中方解石脉体	-11.4	82.2	-16.7
溪3	X3-4C	1 543.2	泥岩中方解石脉体	-11.1	82.2	-16.4

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Alteration of reservoir-caprock systems by using CO₂-rich fluid in the Huangqiao area, North Jiangsu Basin

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