永进油田致密储集层岩石力学参数剖面构建及应用

doi:10.7657/XJPG20240314

摘要/Abstract

摘要：

为评价低渗致密储集层可压裂性，对准噶尔盆地沙湾凹陷永进油田Y301井和Y3井的6块岩心进行实验，获得岩心矿物组分、孔隙度、应力—应变曲线、纵波速度、横波速度等参数，实验结果与测井、录井数据基本吻合，构建了研究区岩石力学参数经验模型。同时，基于等效介质模型，考虑矿物组分和孔隙结构特征建立了一种新的岩石脆性指数计算模型。在此基础上，提出了基于测井数据的低渗致密储集层力学参数剖面构建方法，并以Y301井为例进行了计算，结果表明，Y301井齐古组可压裂性良好，为致密砂岩储集层可压裂性综合评价奠定了基础。

关键词: 准噶尔盆地, 沙湾凹陷, 齐古组, 致密储集层, 岩石力学, 等效介质模型, 脆性指数, 可压裂性

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

中图分类号:

TE112.23

盖姗姗, 王子振, 刘浩杰, 张文盛, 于文政, 杨崇翔, 王玉萍. 永进油田致密储集层岩石力学参数剖面构建及应用[J]. 新疆石油地质, 2024, 45(3): 362-370.

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.

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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