四川盆地川西坳陷上三叠统须家河组储层各向异性地应力评价方法

doi:10.11743/ogg20210416

Abstract

Abstract:

The Triassic Xujiahe Formation sandstones in the western Sichuan Depression are tight gas reservoirs, some of which contain natural fractures, particularly for the gas-rich reservoir in the 2nd member of the Xujiahe Formation (hereafter referred to as Xu 2 Member) with well-developed vertical or high dip angle fractures. Anisotropies of both rocks and horizontal principal stresses are thereby resulted. To calculate in-situ stresses in the naturally fractured formations using conventional methods obtained in the isotropic formation may overestimate the horizontal principal stress. New assessment methods of in-situ stresses in the anisotropic formations are studied in this paper. The in-situ stressess and formation pressures in the Xinchang and Hexinchang gas fields are obtained based on measured data from wellbore influxes, kicks, mini-frac tests and wellbore breakouts.The measured results indicate that natural fractures have a great impact on the in-situ stresses. The theory of anisotropy is applied to establish the in-situ stress models of VTI and HTI for the Xujiahe Formation reservoirs. The measured data in the formations with natural fractures reveal that the horizontal principal stress and formation breakdown pressure decrease as the natural fracture density, dip angle and intensity index increase. This is consistent to the derived HTI model. The assessment methods for in-situ stresses and their impact on hydraulic fracturing are proposed for the Xujiahe Formation reservoirs based on the anisotropic model and the measured data of natural fractures, horizontal stresses and breakdown pressures.

Key words: fissured formation, horizontal principal stress, in-situ stress, anisotropy, hydraulic fracturing, Xujiahe Formation, Triassic, Sichuan Basin

CLC Number:

TE122.2

Jincai Zhang, Xin Fan, Zhiwen Huang, Zhongqun Liu, Yuanchang Qi. Assessment of anisotropic in-situ stressses in the Upper Triassic Xujiahe Formation reservoirs in Western Sichuan Depression of the Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 963-972.

Figures/Tables 10

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井名	层位	测试段中部深度/m	孔隙压力/MPa	孔隙压力系数
XC12	T₃x⁴⁽⁸⁾	3 679.10	69.14	1.92
XC23	T₃x^4(9-10)	4 022.55	67.69	1.72
XC25	T₃x⁴⁽⁴⁾	3 412.50	63.37	1.89
CX93	T₃ x^4(3-4)	3 410.00	65.97	1.97
X851	T₃x²⁽⁴⁾	4 834.60	80.46	1.70
X853	T₃x²⁽⁷⁾	4 974.63	80.79	1.66
X856	T₃x²⁽⁴⁾	4 837.40	75.99	1.60
X2	T₃x^2(1-4)	4 803.65	71.61	1.52
X3	T₃x²⁽⁵⁾	4 887.70	68.74	1.44
X5	T₃x²⁽⁷⁾	5 158.66	73.98	1.46
X11	T₃x²⁽⁴⁾	4 917.50	68.79	1.43
X10	T₃x^2(4-5)	4 893.08	80.10	1.67
XC8	T₃x^2(2-3)	4 793.69	67.30	1.43

测试方法	井名	层位	测试段中部深度/m	垂向应力/MPa	最小水平主应力/MPa	最大水平主应力/MPa	最小水平主应力梯度/(MPa·km^-1)	最大水平主应力梯度/(MPa·km^-1)
测试压裂	CX560	T₃x⁴⁽⁴⁾	3 524.00	86.30	80.80	-	22.9	-
	CX565	T₃x⁴⁽⁷⁾	3 815.48	93.50	91.20	104.00	23.9	26.1
	CX565	T₃x⁴⁽⁹⁾	3 978.50	97.50	89.70	110.00	22.5	28.8
	XC23	T₃x⁴⁽⁹⁾	4 022.55	98.60	102.00	-	25.4	-
	XC25	T₃x⁴⁽⁹⁾	3 921.00	96.10	96.10	121.30	24.5	30.9
	X10	T₃x²⁽²⁾	4 722.00	115.69	102.70	171.40	21.7	36.3
	X11	T₃x²⁽⁴⁾	4 971.50	121.80	107.40	173.00	21.6	34.8
	X11	T₃x^2(6-8)	5 142.50	125.99	118.40	201.30	23.0	39.1
	X209	T₃x²⁽⁴⁾	4 872.00	119.36	105.50	158.40	21.7	32.5
	XC7	T₃x²⁽⁶⁾	5 151.40	126.21	106.40	168.83	20.7	32.8
成像测井，应力多边形	L150	T₃x²⁽³⁾	4 805.50	117.26	96.07	143.64	20.0	29.9
	X10	T₃x²⁽²⁾	4 692.50	114.97	97.13	144.53	20.7	30.8
	X10	T₃x²⁽³⁾	4 792.90	117.43	98.25	141.87	20.5	29.6
	X10	T₃x²⁽⁴⁾	4 892.10	119.86	101.76	147.25	20.8	30.1
	X10	T₃x²⁽⁴⁾	4 905.30	120.18	103.99	152.55	21.2	31.1
	X10	T₃x²⁽⁶⁾	5 087.50	125.15	106.84	159.24	21.0	31.3
差应变分析	CX560	T₃x²⁽²⁾	4 810.97	125.00	102.00	141.00	21.2	29.3
	CH127	T₃x²⁽¹⁾	4 566.14	111.87	100.65	135.09	22.0	29.6
	CH127	T₃x²⁽²⁾	4 639.29	113.66	104.72	137.60	22.6	29.7
	XC10	T₃x²⁽⁴⁾	4 882.06	119.61	107.93	148.86	22.1	30.5
	XC10	T₃x²⁽⁴⁾	4 884.04	119.66	104.76	140.75	21.4	28.8

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Assessment of anisotropic in-situ stressses in the Upper Triassic Xujiahe Formation reservoirs in Western Sichuan Depression of the Sichuan Basin

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