| 水驱对原油饱和烃馏分影响的分子地球化学表征 |
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| 引用本文： | 常象春,梁吉学,崔晶,王涛.水驱对原油饱和烃馏分影响的分子地球化学表征[J].沉积学报,2018,36(1):206-214. |
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| 作者姓名： | 常象春 梁吉学 崔晶 王涛 |
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| 作者单位： | 1.山东科技大学山东省沉积成矿作用与沉积矿产重点实验室, 山东青岛 266590; |
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| 基金项目： | 国家自然科学基金项目（41272139，41772120）；山东省自然科学杰出青年基金项目（JQ201311） |
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| 摘 要： | 利用GC、GC/MS分析技术，对水驱开发的曲9油藏进行了原油饱和烃馏分的动态变化对比。研究表明，随着水驱推进，在9个多月的动态监测中，原油饱和烃馏份表现出明显的变化规律，逐渐升高的有饱和烃相对含量、C15-RD/C15-D、C158β（H）-D/C168β（H）-HD、TTs/17α-H、RS/17α-H等比值；逐渐降低的有芳烃相对含量、轻重比参数∑nC21-/∑nC22+、∑nC14-/∑nC15+；基本保持稳定不变的有异构烷烃比值Pr/Ph、iC18/Pr、iC18/Ph，萜烷比值C21/C22TT、C24/C23TT、∑C19-26/∑C28-29TTs、C30*/C29Ts、C35R/C34R、Ol/C30H、G/C31R、C3122S/（22S+22R）、C30M/C30H、Ts/（Ts+Tm）、C29Ts/（C29Ts+C29H），甾烷比值C27-DS/C27-RS、C2920S/（20S+20R）、C29ββ/（ββ+αα）、C27-重排甾烷20S/（20S+20R）等；先升高再降低，或先降低再升高的分异变化的有Pr/nC17和Ph/nC18。水洗作用造成芳烃相对含量与轻重比的降低，生物降解作用引起了三环萜烷与规则甾烷相对藿烷的富集，二者虽然对相近碳数的异构烷烃、萜烷、甾烷比值影响甚微，却合力促使了补身烷参数的升高。注水过程中的色层效应进一步导致了饱和烃馏分的分异。
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| 关 键 词： | 注水开发 饱和烃馏份 油藏地球化学 次生蚀变 |
| 收稿时间： | 2016-12-15 |
Geochemical Characterization of Alteration of Saturate Fractions by Water Flooding |
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| Institution: | 1.Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;3.Luming Branch of Shengli Oilfield Company, Sinopec, Dongying, Shandong 257001, China |
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| Abstract: | Based on the GC and GC-MS analysis, modification of saturate fractions in waterflooded oils from Qu9 reservoir was dynamically investigated. The results indicate that with the advance of waterflooding, saturates characterize obvious alterations during 9-months dynamic surveillance. Saturate concentration, C15-RD/C15-D, C158β(H)-D/C168β(H)-HD, TTs/17α-H and RS/17α-H ratios, are progressively increasing in values. Aromatic concentration∑nC21-/∑nC22+ and ∑nC14-/∑nC15+reduce continually. Isoalkane related ratios of Pr/Ph, iC18/Pr, iC18/Ph, terpane related ratios of C21/C22TT, C24/C23TT, ∑C19-26/∑C28-29TTs, C30*/C29Ts, C35R/C34R, Ol/C30H, G/C31R, C3122S/(22S+22R), C30M/C30H, Ts/(Ts+Tm) and C29Ts/(C29Ts+C29H), and sterane related ratios of C27-DS/C27-RS, C2920S/(20S+20R), C29ββ/(ββ+αα) and C27-rearranged sterane 20S/(20S+20R), keep relatively unchanged. However, irregular variation of Pr/nC17 and Ph/nC18 shows an initial increase and subsequent decrease, or the opposite. Water washing leads to the decrease of aromatics and light/heavy alkane values, while the biodegradation results in the concentration of tricyclic terpanes and regular sterane compared to the hopanes. Although they have minor effect on the ratios respectively composed of two isoalkanes, terpanes and steranes with similar carbon numbers, they cause the increase of drimane parameters in combination. Mixed with the geo-chromatography and wettability transformation in water flooding, saturates compositions were further altered. |
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