塔里木盆地缝洞型白云岩储层测井细分方法与应用

doi:10.3969/j.issn.1672-7703.2021.05.012

摘要/Abstract

摘要： 塔里木盆地下古生界盐下及潜山白云岩储层横向分布范围广，油气藏类型多，符合典型的叠合复合盆地特征，具有良好的油气勘探开发前景。缝洞型储层是白云岩储层中最具代表性也是最有优势的储层，开展对缝洞型储层的精细评价有助于提高该区域地质认识和储层识别。首先，依据岩心微观、宏观尺度下的孔隙发育特征及岩石物理实验特征，缝洞型储层可细分为简单组合型与溶蚀扩大型两个小类。然后，从电成像测井、常规测井两个方面分析两类缝洞型储层的测井响应特征，提取孔隙度谱峰值、孔隙度谱宽度、声速偏差、裂缝孔隙度和基质渗透率等特征参数，结合应用实例建立储层类型划分半定量判别图版，结果表明，电成像测井和常规测井组合识别储层类型效果较好。研究发现，塔中地区盐下白云岩溶蚀扩大缝洞型储层最为发育，塔北地区多以简单组合缝洞型储层为主，该细分方法具有较强的实用性和推广性。

关键词: 塔里木盆地, 白云岩, 缝洞型储层, 测井

Abstract: The Lower Paleozoic dolomite reservoir in sub-salt and buried hill is widely distributed in Tarim Basin, with multiple types of oil and gas reservoirs, which is the characteristics of typical superimposed composite basin and have good prospects for petroleum exploration. Fracture-vuggy type reservoir is the most representative and favorable among dolomite reservoirs. Fine evaluation of fracture-vuggy type reservoir is helpful to improve geological understandings and reservoir identifi cation in the region. First, the fracture-vuggy type reservoir can be classifi ed into two sub-categories based on the pore features by core observation both microscopically and macroscopically, as well as petrophysical experiments, i.e., simple combination type and dissolution enlargement type. Then, the logging response characteristics of two sub-categories of fracture-vuggy type reservoirs are analyzed by using electrical imaging logging and conventional logging data, and the characteristic parameters are extracted, such as peak of porosity spectrum, width of porosity spectrum, deviation of acoustic velocity, fracture porosity and matrix permeability. Finally, the semi-quantitative discrimination chart for classifi cation of reservoir type is established by combining with application examples. The results show that the method of combining electrical imaging logging and conventional logging has good application result in identifying reservoir types. The dissolution enlargement type fracture-vuggy dolomite reservoir of sub-salt is the most developed in Tazhong area, while the simple combination type fracture-vuggy reservoir is dominated in Tabei area. This classifi cation method is of great practicability and generalization.

中图分类号:

TE112.22

刘沁园, 唐军, 申威, 蔡明, 吴黑志. 塔里木盆地缝洞型白云岩储层测井细分方法与应用[J]. 中国石油勘探, 2021, 26(5): 132-139.

Liu Qinyuan, Tang Jun, Shen Wei, Cai Ming, Wu Heizhi. Petrophysical classifi cation method and application of fracture-vuggy type dolomite reservoir in Tarim Basin[J]. China Petroleum Exploration, 2021, 26(5): 132-139.

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