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评价储层含油性时,热解参数 S_1+S_2是一项有效参数。其中 S_2相对稳定,S_1则随样品类别或露置时间的不同而发生变化。岩心样品的随钻热解分析值比较接近真实,岩屑和井壁取心样品的 S_1会明显损失。而目前多数探井取心进尺少,大多为岩屑录井。在选定区块和层位的条件下,S_1与 S_2具有确定的线性关系,这一关系式可由岩心随钻热解分析来建立。对岩屑或井壁取心样品的 S_1利用相应区块和层位的关系式进行校正,校正后的热解参数 S_1+S_2能更客观地描述储层性质,大大提高评价的可靠性。
Pyrolysis parameters S_1 + S_2 are valid parameters for evaluating oil-bearing properties of reservoirs. S_2 is relatively stable, and S_1 varies with sample type or exposure time. The core-sample pyrolysis analysis values are close to true, and the S_1 of core samples from core cuttings and sidewalls is obviously lost. At present, most exploration wells coring footage less, mostly debris logging. In the selected block and horizon conditions, S_1 and S_2 have a definite linear relationship, which can be established by the core-by-core pyrolysis analysis. Correcting the S 1 of the cuttings or borehole coring samples with the corresponding block and horizon, the corrected pyrolysis parameters S 1 + S 2 can describe the nature of the reservoir more objectively and greatly improve the reliability of the evaluation.