稠油油藏火驱取心井高温氧化区带识别方法

doi:10.3969/j.issn.1006-6535.2022.03.011

摘要/Abstract

摘要： 为了准确识别火驱取心井的高温氧化区带,利用杜66块曙1-46-K037取心井的岩心对原油的族组分、饱和烃、官能团、有机元素和储层的碳酸盐矿物、黏土矿物开展分析。研究表明:受火驱高温作用的影响,高温氧化区带内原油族组分中的饱和烃与芳烃含量增加,非烃与沥青质含量降低;饱和烃气相色谱图中主峰碳降低,轻重比增加,红外光谱中的含氧度增加,有机元素中H/C原子比增加。由于高温条件下矿物存在热分解和相互转化,在高温氧化区带,储层中的碳酸盐矿物(白云石、方解石、菱铁矿)含量降低,黏土矿物中的高岭石、伊利石、绿泥石含量升高,伊蒙混层含量降低。利用原油的特征参数判识的高温氧化区带要窄于利用储层矿物特征判识的高温氧化区带。该研究探索了火驱开发过程原油和储层矿物的变化规律,完善了利用取心井识别高温氧化区带的技术方法。

关键词: 火驱, 稠油, 高温氧化区带识别, 取心井, 储层矿物, 杜66块

Abstract: In order to accurately identify the high-temperature oxidation zones in cored wells with in-situ combustion, cores from Cored Well 1-46-K037 in Block Du 66 were used to analyze the group components, saturated hydrocarbons, functional groups and organic elements of crude oil, as well as the carbonate minerals and clay minerals in the reservoir. The study showed that, under the influence of high temperature of in-situ combustion, the contents of saturated hydrocarbons and aromatic hydrocarbons among group components of the crude oil were increased in the high-temperature oxidation zone, while the contents of non-hydrocarbons and asphaltenes were decreased; the main peak carbon in the gas chromatogram of saturated hydrocarbons was decreased, the weight ratio increased, the oxygen content in the infrared spectrum increased, and the H/C atomic ratio in organic elements increased. Due to the thermal decomposition and interconversion of minerals at high temperature, the content of carbonate minerals (dolomite, calcite and siderite) in the reservoir was decreased in the high-temperature oxidation zone, while the content of kaolinite, illite and chlorite in the clay minerals increased and the content of illite-smectite mixture decreased. The high-temperature oxidation zone identified by the characteristic parameters of crude oil should be narrower than the high-temperature oxidation zone identified by the characteristics of the reservoir minerals. The study explores the changing laws of crude oil and reservoir minerals during in-situ combustion, and improved the technical method for identifying high-temperature oxidation zones with cored wells.

Key words: in-situ combustion, heavy oil, high-temperature oxidation zone identification, coring well, reservoir minerals, Block Du 66

中图分类号:

TE357

刘其成, 闫红星, 杨俊印, 程海清, 董晓东. 稠油油藏火驱取心井高温氧化区带识别方法[J]. 特种油气藏, 2022, 29(3): 76-83.

Liu Qicheng, Yan Hongxing, Yang Junyin, Cheng Haiqing, Dong Xiaodong. Identification of High-Temperature Oxidation Zones in Cored Wells for Development with In-situ Combustion of Heavy Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 76-83.

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