Establishment and Application of Rock Mechanical Parameter Profile to Tight Reservoirs in Yongjin Oilfield

doi:10.7657/XJPG20240314

Abstract

Abstract:

In order to study the fracability evaluation method for low-permeability tight reservoirs, experiments were conducted on six core samples from Well Y301 and Well Y3 in the Yongjin oilfield, Shawan sag, Junggar basin, and the parameters such as rock mineral composition, porosity, stress-strain curves, P-wave velocity, and S-wave velocity were obtained. The experiment results agreed well with logging data, and an empirical rock mechanical model was established for the study area. Meanwhile, based on the equivalent medium model, a new model considering mineral composition and pore structure characteristics was developed for calculating rock brittleness index. Then, a method for constructing the rock mechanical parameter profile of low-permeability tight reservoirs based on logging data was established and applied in Well Y301. The application results show that the Qigu formation in Well Y301 has good fracability, which lays a foundation for the comprehensive evaluation of fracability of tight sandstone reservoirs.

Key words: Junggar basin, Shawan sag, Qigu formation, tight reservoir, rock mechanics, equivalent medium model, brittleness index, fracability

CLC Number:

TE112.23

GAI Shanshan, WANG Zizhen, LIU Haojie, ZHANG Wensheng, YU Wenzheng, YANG Chongxiang, WANG Yuping. Establishment and Application of Rock Mechanical Parameter Profile to Tight Reservoirs in Yongjin Oilfield[J]. Xinjiang Petroleum Geology, 2024, 45(3): 362-370.

Figures/Tables 10

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井名	岩心编号	深度/m	矿物含量/%					孔隙度/%
井名	岩心编号	深度/m	石英	斜长石	钾长石	白云石	黏土矿物	孔隙度/%
Y301井	1号	5 543.11	41.7	54.2	0	0	4.1	7.25
Y301井	2号	5 543.86	44.7	28.6	11.6	0	15.1	5.36
Y3井	3号	984.64	46.6	24.1	0	0	29.3	1.81
Y301井	4号	5 545.91	51.3	35.5	0	7.5	5.7	10.85
Y3井	5号	985.11	39.5	22.3	0	0	38.2	1.54
Y3井	6号	985.54	36.1	36.7	0	0	27.2	2.84

岩心编号	微观弹性模量/ GPa	硬度/ GPa	断裂韧性/ （Pa·m^1/2）
1号	32.84	3.24	60 553.4
2号	50.09	4.41	89 972.2
3号	29.29	1.47	45 215.9
4号	53.38	5.22	98 713.8
5号	45.48	3.50	72 886.4
6号	43.92	3.46	73 076.0