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为了揭示塔里木盆地深部储层中原油热演化特征及热成熟作用、硫酸盐热化学还原作用(TSR)对油源对比指标的影响,利用黄金管-封闭体系分别进行了纯热作用(TCA)和TSR条件下的原油热裂解模拟实验.结果表明:原油热裂解受控于原油类型、化学组成及其浓度、温度与TSR等多种因素,其中温度是关键因素.在easyRo分别达到0.80%、0.96%、1.19%后,甾烷、藿烷、链烷烃迅速裂解.在一定热成熟度范围内(easyRo=0.40%—0.80%),随成熟度增加,原油中三芳甾烷分布和C_(28)规则甾烷相对丰度变化不太明显,仍可作为塔里木海相油源对比的有效指标,但当easyRo达到0.96%后,原油中甾烷、三芳甾烷由于热裂解丰度显著降低,相关指标将不适用于混有高-过熟原油的油源识别;观察到Pr/Ph变化受原油成因类型和TSR多因素影响,伽玛蜡烷/C_(30)藿烷、重排甾烷/规则甾烷等指标有随成熟度增加而增加的趋势,该现象需在油源对比中引起重视.本次实验未发现TSR与原油中硫芴有直接的联系,可能指标本次实验中TSR作用较弱,暗示塔里木高丰度硫芴海相原油可能经历了较强的TSR作用.
In order to reveal the thermal evolution and thermal maturation of crude oil in the deep reservoirs of the Tarim Basin and the effects of thermochemical sulfate reduction (TSR) on the oil source correlation index, pure thermal effects (TCA) and TSR conditions.The results show that the pyrolysis of crude oil is controlled by the types of crude oil, chemical composition and concentration, temperature and TSR, among which the temperature is the key factor.When easyRo reaches 0.80% and 0.96 %, 1.19%, the steranes, hopanes and paraffins were rapidly pyrolyzed.With a certain degree of maturity (easyRo = 0.40% -0.80% The relative abundance of regular steranes is not obvious and can still be used as an effective indicator of oil source correlation in the Tarim Sea. However, when the content of easyRo reaches 0.96%, the content of steranes and triarylsnes in crude oil decreases significantly due to the thermal cracking, Will not be suitable for the identification of oil source mixed with high-over-mature crude oil. It is observed that the variation of Pr / Ph is affected by the type of crude oil and the multi-factor of TSR. The gamma-wax / C 30 hopane, rearrangement sterane / Steranes and other indicators have increased with the maturity of the trend Potential, the phenomenon needs attention in the oil source contrast.This experiment did not find TSR and crude oil sulfur fluorene has a direct link may be indicators of the role of TSR in this experiment is weak, suggesting that Tarim high-density sulfur fluorene marine oil May have experienced a strong role of TSR.