页岩油储层核磁共振T₁-T₂谱响应特征及应用——以松辽盆地古龙凹陷青山口组为例

Response characteristics and application of nuclear magnetic resonance T1-T2 spectrum in shale oil reservoirs: a case study of Qingshankou Formation in Gulong Sag, Songliao Basin

摘要

为明确松辽盆地古龙凹陷页岩油储层二维核磁共振响应特征,测试分析不同状态页岩T₁-T₂谱,结合孔隙流体动态响应特征建立T₁-T₂谱识别图版,并构建页岩孔隙油、水T₁-T₂谱信号幅度标线方程,计算不同状态页岩孔隙流体含量,探讨原位状态下不同孔隙流体含量主控因素。结果表明:古龙凹陷页岩油储层T₁-T₂谱可分为7个区域,能有效区分各种孔隙流体分布;页岩储层孔隙流体以毛细管束缚水为主,原始状态下,平均为20.95 mg/g,总油量相对较高,与常规热解油量具有良好相关关系,平均为9.67 mg/g;页岩油以束缚油为主,其次为吸附油,可动油较少,其中可动油最易散失,束缚油次之,吸附油和毛细管束缚水散失较少;原位状态下,页岩含油量主要受有机碳、黏土矿物和成熟度控制,总有机碳与黏土矿物质量分数越高,成熟度越大,含油性越好,吸附油随成熟度增大而逐渐降低。

Abstract

To clarify the two-dimensional nuclear magnetic resonance (NMR) characteristics of shale oil reservoirs in Gulong Sag, T₁-T₂ spectra of shales at different states were systematically detected and analyzed. The T₁-T₂ pattern was proposed, and the signal amplitudes of pore water and oil were also calibrated to calculate the pore fluids at different states in shale pore networks. The main controlling factors of different pore fluid contents in the in-situ state were further explored. The results show that the T₁-T₂ pattern of the shale oil reservoir in Gulong Sag includes 7 regions, which can effectively distinguish the distribution of various pore fluids. The shale pore fluid mainly consists of capillary-bound water, with an average of 20.95 mg/g in as-received state. The total oil content is relatively high and has a good correlation with the oil content obtained by conventional pyrolysis, with an average value of 9.67 mg/g. Shale oil is mainly composed of bound oil, followed by adsorbed oil, with less movable oil. Among them, movable oil is the most easily dispersed, followed by bound oil, with less loss of adsorbed oil and capillary-bound water. In-situ shale oil content is mainly controlled by organic carbon, clay minerals, and maturity. The higher the content of organic carbon and clay minerals, the greater the maturity and the higher the oil content. While the adsorbed oil is decreasing with increasing maturity.

关键词

页岩油 / 孔隙流体 / 核磁共振 / T₁-T₂谱 / 青山口组 / 古龙凹陷 / 松辽盆地

Key words

shale oil / pore fluids / nuclear magnetic resonance / T₁-T₂ spectrum / Qingshankou Formation / Gulong Sag / Songliao Basin

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基金资助

中国石油天然气股份有限公司重大科技专项(2021ZZ10)