四川盆地川西坳陷新场须家河组二段致密砂岩储层裂缝发育特征及主控因素

doi:10.11743/ogg20210410

Abstract

Abstract:

The sandstone reservoirs in the 2^nd member of Xujiahe Formation (hereafter referred to as Xu 2 Member) in Xinchang area, Western Sichuan Depression, are characterized by deep burial depth and tightness, to which the natural fractures are critical. An integration of outcrop survey, core description, conventional and imaging logging interpretation is applied to analyze the development characteristics of natural fractures in the gas reservoirs therein. It is believed that these fractures can be categorized as network fractures, vertical fractures, high dip angle fractures, horizontal fractures, oblique fractures, and low dip angle fractures, with the last two in the dominant position. Mainly developed in the middle and upper submembers of Xu 2 Member in central and eastern Xinchang tectonic belt, these fractures generally trend NE-SW, NW-SE and EW, basically consistent with that of the present maximum principal stress within, with the EW-striking structural fractures in the late period the most developed. On the other hand, the cross-plotting analysis of fracture and productivity parameters, serves to clarify the contribution of different types of fractures to productivity, and the results show that the effective fractures in the Xu 2 Member gas pool are structural ones with a dip angle of over 30° (namely, vertical, high dip angle and oblique fractures). The development of effective fractures in the study area is controlled by many factors, including faulting, tectonic deformation, grain size, rock composition, and stratum thickness, etc., and the distance from the late SN-striking reverse fault is the most critical factor controlling the development of natural structural fractures, followed by structural deformation and structural pattern in combination. In conclusion, the area with well-developed folds and within 200 m away from the hanging wall of the late SN-striking reverse fault can be regarded as a key zone for future fracture prediction, evaluation and natural gas development in Xinchang area.

Key words: thrusting fault, structural fracture, tight sandstone reservoir, Xujiahe Formation, Xinchang gas field, Western Sichuan Depression, Sichuan Basin

CLC Number:

TE122.2

Wangpeng Li, Zhongqun Liu, Zongquan Hu, Wujun Jin, Pengwei Li, Junlong Liu, Shilin Xu, Anlai Ma. Characteristics of and main factors controlling the tight sandstone reservoir fractures in the 2^nd member of Xujiahe Formation in Xinchang area, Western Sichuan Depression, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 884-897, 1010.

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砂组	岩心长度/m	裂缝数/条						井名
砂组	岩心长度/m	平缝	低角度缝	斜缝	高角度缝	立缝	合计	井名
Tx²⁽²⁾	76.96	127	63	87	3	12	292	川孝560、新11、新201、新3、新5、新场6
Tx²⁽³⁾	24.00	22	7	25	5	4	63	新201、新场7
Tx²⁽⁴⁾	100.43	933	285	34	4	28	1284	新10、新101、新201、新203、新3、新5、新场8
Tx²⁽⁵⁾	28.88	468	14	0	0	11	493	新10、新101、新11、新5
Tx²⁽⁶⁾	29.25	270	72	121	0	0	463	新11、新场6、新场7
Tx²⁽⁷⁾	44.47	250	92	65	0	2	409	新203、新场501、新场7、新场8
合计	303.99	2070	533	332	12	57	3 004

成像砂组	立缝		高角度缝		斜缝		低角度缝		平缝
成像砂组	平均密度/(条·m^-1)	平均开度/mm	平均密度/(条·m^-1)	平均开度/mm	平均密度/(条·m^-1)	平均开度/mm	平均密度/(条·m^-1)	平均开度/mm	平均密度/(条·m^-1)	平均开度/mm
Tx²⁽²⁾	0.036 2	0.052 694 8	0.066 8	0.058 021 1	0.106 5	0.054 425 7	0.155 2	0.084 190 4	0.060 6	0.067 899 4
Tx²⁽³⁾	0.023 5	0.058 872 7	0.028 1	0.042 386 0	0.064 4	0.046 529 4	0.093 0	0.057 648 3	0.075 3	0.054 887 5
Tx²⁽⁴⁾	0.045 2	0.021 759 5	0.043 7	0.048 395 3	0.106 7	0.061 750 0	0.136 5	0.096 425 2	0.098 1	0.074 183 4
Tx²⁽⁵⁾	0.098 1	0.056 820 5	0.128 1	0.068 631 6	0.132 8	0.084 695 8	0.130 7	0.167 639 3	0.093 0	0.135 810 2
Tx²⁽⁶⁾	—	—	0.070 9	0.036 793 2	0.109 4	0.090 508 8	0.118 9	0.077 069 7	0.065 0	0.051 056 3
Tx²⁽⁷⁾	0.012 0	0.010 925 5	0.055 5	0.035 574 6	0.056 7	0.026 258 6	0.049 3	0.176 307 3	0.058 4	0.225 437 5
Tx²⁽⁸⁾	—	—	0.016 9	0.008 121 3	0.041 5	0.020 390 2	0.068 5	0.082 204 1	0.031 5	0.046 203 8
平均	0.043 0	0.040 214 6	0.058 6	0.042 560 4	0.088 3	0.054 936 9	0.107 5	0.105 926 3	0.068 8	0.093 639 7

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Characteristics of and main factors controlling the tight sandstone reservoir fractures in the 2^nd member of Xujiahe Formation in Xinchang area, Western Sichuan Depression, Sichuan Basin

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Characteristics of and main factors controlling the tight sandstone reservoir fractures in the 2nd member of Xujiahe Formation in Xinchang area, Western Sichuan Depression, Sichuan Basin

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Characteristics of and main factors controlling the tight sandstone reservoir fractures in the 2^nd member of Xujiahe Formation in Xinchang area, Western Sichuan Depression, Sichuan Basin