准噶尔盆地西北缘玛2井区致密储层裂缝发育特征及定量预测

doi:10.3969/j.issn.1006-6535.2022.03.007

摘要/Abstract

摘要： 针对准噶尔盆地西北缘玛2井区致密储层裂缝的发育情况及空间分布和尺寸难以定量预测的难题,在利用岩心、薄片、成像测井等资料对裂缝特征进行分析的基础上,利用Petrel的Kinetix裂缝模拟模块,基于地应力场的数值模拟技术,定量预测裂缝尺寸及空间分布,并对模拟结果进行验证。研究结果表明:玛2井区裂缝以剪切裂缝为主,裂缝密度为5～6条/m,并逐渐向两翼延伸,裂缝开度为0.00～0.20 mm;玛2井区裂缝分布具有明显的纵向非均质性和平面非均质性特征,裂缝集中发育段和裂缝不发育段相间出现,大部分断裂带附近裂缝发育程度高。利用水平井微地震监测资料与裂缝模型模拟结果相互证实裂缝分布的长度、宽度等空间展布特征更合理。该研究成果可为玛湖油田玛2井区开发方案的实施与优化提供重要依据。

关键词: 致密储层, 裂缝, 应力, 地质模型, 定量预测, 玛2井区

Abstract: To address the difficulties in quantitative prediction of the development, spatial distribution and size of fractures in dense reservoirs in Well Block Ma 2, Northwest Margin, Junggar Basin, the size and spatial distribution of fractures were predicted quantitatively and the results were verified with Petrel's Kinetix fracture simulation module and numerical simulation technology based on crustal stress field, on the basis of analysis on fracture characteristics with cores, slices, imaging logging and other data. The results of the study showed that, the fractures in Well Block Ma 2 were dominated by shear fractures with a density of 5-6 fractures/m and gradually extended to the wings, and the fracture aperture was 0.00 to 0.20 mm; the fracture distribution in Well Block Ma 2 was significantly heterogeneous in longitudinal and planar direction, the fracture-concentrated sections alternated with the fracture-undeveloped sections, and fractures were well developed around most of fault zones. It is more reasonable to characterize the spatial distribution characteristics, such as length and width of fractures, with the microseismic monitoring data of horizontal wells and the results of fracture simulation. The study results provide an important basis for the implementation and optimization of development schemes for Well Block Ma 2, Mahu Oilfield.

Key words: tight reservoir, fractures, stress, geological model, quantitative prediction, Well Block Ma 2

中图分类号:

TE122

李晓梅, 张记刚, 陈超, 李洲, 刘振平. 准噶尔盆地西北缘玛2井区致密储层裂缝发育特征及定量预测[J]. 特种油气藏, 2022, 29(3): 50-56.

Li Xiaomei, Zhang Jigang, Chen Chao, Li Zhou, Liu Zhenping. Fracture Development Characteristics and Quantitative Prediction of Tight Reservoirs in Well Block Ma 2, Northwestern Margin, Junggar Basin[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 50-56.

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