川南地区深层页岩气富集条件差异分析与启示

doi:10.11764/j.issn.1672-1926.2020.11.020

Abstract

Abstract:

In recent years， shale gas exploration and development of O₃w-S₁l¹ in southern Sichuan Basin have gradually expanded to the deep reservoirs （vertical depth between 3 500 m and 4 500 m）. Preliminary progress have been made in two deep areas， including LZ block and DZ block， and the results of shale gas exploration and development are different （the former is obviously superior to the latter）， which is mainly related to the difference of enrichment conditions. This article takes Wufeng-Longmaxi formations of LZ block and DZ block as the research objects， and has comprehensively made use of the latest data of drilling， logging， well logging， seismic and experiments， and finally has clarified the characteristics， differences and main controlling factors of enrichment conditions in two blocks. The researches show that：（1）LZ block is superior to DZ block in shale gas enrichment elements， such as formation thickness， organic matter abundance， physical property characteristics， gas bearing property， as well as the thickness and quality of shale reservoir. （2）During the formation period of Wufeng-Longmaxi formations， LZ block was always located in the sedimentary center of deep-water continental shelf in southern Sichuan basin， and its paleosedimentary environment was superior to that of DZ block. And the difference of paleosedimentary environment resulted in the difference of organic matter accumulation and reservoir scale （thickness and quality） in the two blocks. （3）The preservation condition of DZ block is obviously controlled by fault-natural fracture system， while the shale gas leakage in LZ block is less affected by fault-natural fracture system. The pressure coefficient is the largest in southern Sichuan Basin， and the preservation condition is better. The comprehensive study suggests that， in the two deep areas of LZ block and DZ block in southern Sichuan Basin， the main controlling factors of shale gas enrichment difference are paleosedimentary environment and preservation conditions. The concept of "exploring deep-water shale reservoir in the deep area" should be upheld in the exploration and development of deep shale gas in southern Sichuan Basin. Several wide and slow syncline structures which developed among the fault-anticlines in the south side of southern Huayingshan fault-zones should be the potential favorable areas for shale gas exploration in the next stage. And the geological conditions of S₁l^1-1-4 in LZ block are superior， with the feasibility of three-dimensional development for double-layers.

Key words: Wufeng-Longmaxi formations, Deep shale gas, Enrichment conditions, Difference, Enlightenment

CLC Number:

TE121.1

Cheng-lin ZHANG, Sheng-xian ZHAO, Jian ZHANG, Cheng CHANG, Zi-qiang XIA, Lie-yan CAO, Chong TIAN, Jiang-Rong FENG, Yuan FANG, Yi ZHOU. Analysis and enlightenment of the difference of enrichment conditions for deep shale gas in southern Sichuan Basin[J].Natural Gas Geoscience, 2021, 32(2): 248-261.

Figures/Tables 15

Fig.1

Fig.2

Table 1

Experimental data statistical table for reservoirs in layers of O3w-S1l1-1, LZ block and DZ block"

区块	地层		地层厚度/m	脆性矿物含量/%	TOC/%	孔隙度/%	含气量/(m3/t)	含气饱和度 /%
LZ	龙一₁亚段	龙一₁⁴小层	$55.7 ~ 68 61.2$	$28 ~ 81 55.5$	$0.16 ~ 3.9 2.2$	$2.2 ~ 7.4 5.1$	$1.1 ~ 8.7 5.6$	$55.0 ~ 71.4 62.4$
		龙一₁³小层	$5 ~ 9.1 6.8$	$45 ~ 87 64.9$	$2.18 ~ 4.76 3.4$	$3.77 ~ 7.63 5.5$	$4.3 ~ 9.5 7.0$	$60.6 ~ 74.4 69.2$
		龙一₁²小层	$2.9 ~ 6.2 4.4$	$64 ~ 90 82.6$	$3.1 ~ 4.56 3.8$	$3.97 ~ 6.8 5.1$	$6.2 ~ 9.0 7.8$	$67.1 ~ 86.6 77.7$
		龙一₁¹小层	$1.5 ~ 3.2 1.9$	$55 ~ 82 75.3$	$3.8 ~ 7.3 4.8$	$4.22 ~ 6.35 4.9$	$6.6 ~ 9.5 7.9$	$64.6 ~ 86.8 76.7$
	五峰组		$5.9 ~ 10.8 8.2$	$48 ~ 89 69.2$	$0.2 ~ 5.1 2.7$	$1.31 ~ 5.49 3.5$	$1.7 ~ 7.6 4.1$	$68.1 ~ 73.8 71.1$
DZ	龙一₁亚段	龙一₁⁴小层	$20.7 ~ 31.8 26.1$	$41.2 ~ 76.3 58.6$	$0.52 ~ 2.24 1.4$	$1.92 ~ 5.88 4.0$	$1.9 ~ 5.8 3.9$	$44.4 ~ 61.8 56.2$
		龙一₁³小层	$1.2 ~ 2.7 2.1$	$42.2 ~ 83.8 67.1$	$1.39 ~ 3.42 2.5$	$1.8 ~ 6.5 4.2$	$4.0 ~ 5.4 4.6$	$47.9 ~ 69.4 60.8$
		龙一₁²小层	$1.2 ~ 2.6 1.6$	$63.8 ~ 88.6 74.8$	$1.89 ~ 4.77 2.8$	$1.5 ~ 5.6 3.5$	$3.7 ~ 6.6 4.8$	$30.3 ~ 73.9 58.9$
		龙一₁¹小层	$1.2 ~ 2.4 1.8$	$71.2 ~ 89.4 80.9$	$3.18 ~ 5.31 4.3$	$1.77 ~ 6.01 4.2$	$5.6 ~ 8.5 6.7$	$51.3 ~ 76.5 65.3$
	五峰组		$6.4 ~ 8.8 7.7$	$58.9 ~ 88.9 82.5$	$0.31 ~ 3.58 1.8$	$2.0 ~ 5.0 3.6$	$0.33 ~ 5.0 2.5$	$48.8 ~ 69.2 62.1$

Table 1

Fig.3

Fig.4

Table 2

Fig.5

Fig.6

Table 3

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

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区块	井号	埋深 /m	压力系数	区块	井号	埋深 /m	压力系数
DZ	Z1-H1	4 402	1.89	LZ	Y4-5	4 060	2.17
	Z2	3 980	1.86		Y10-3	3 811	2.12
	Z3	4 174	1.96		Y1	3 530	2.25
	Z2H3-2	3 577	2.03		Y1-H2	3 403	2.24
	Z3H1-1	4 084	2.03		Y2-H1	3 895	2.18
	Z5	3 660	1.93		Y3-H1	3 442	2.1

指标	缺氧	贫氧	常氧
指标	深水强还原环境	半深水弱还原环境	浅水氧化环境
水体溶氧量	<0.1 mL/L	0.1~1 mL/L	>1 mL/L
V/(V+Ni)	>0.54	0.46~0.54	<0.46
Ni/Co	>7	5.00~7.00	<5
U/Th	>1.25	0.75~1.25	<0.75
Re/Mo	<0.8×10^-3	(0.8~9)×10^-3	>9×10^-3

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Analysis and enlightenment of the difference of enrichment conditions for deep shale gas in southern Sichuan Basin

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