塔中隆起中深5井与中深1井■和烷基■分布特征与油源启示  

The distribution of chrysene and methylchrysenes in oils from wells ZS5 and ZS1 in the Tazhong Uplift and its implications in oil-to-source correlation

作　　者：王道伟[1,2,3] 王铁冠[2,3] 李美俊[2,3] 宋到福[2,3] 师生宝[2,3] 

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《地球化学》2016年第5期451-461,共11页Geochimica

基　　金：国家自然科学基金(41272158);油气资源与探测国家重点实验室导向性课题(PRP/indep-2-1402)

摘　　要：塔里木盆地塔中隆起中深5井在下寒武统(?_1w)吾松格尔组白云岩中有油显示,属低凝、低黏度、低硫、含蜡轻质油。分析了中深5井、中深1井和中深1C井原油中■、苯并[a]蒽及其烷基取代系列和稳定碳同位素的分布特征,并与塔里木盆地台盆区古生界典型烃源岩及相关原油进行对比,结果表明,中深5井和中深1井原油中苯并[a]蒽及甲基苯并[a]蒽相对于■及甲基■的含量很低,碳同位素较轻,与上奥陶统烃源岩具可比性,而中深1C井原油中苯并[a]蒽及甲基苯并[a]蒽相对含量较高,碳同位素较重,并与寒武系烃源岩具可比性。对于缺少常规甾萜类生物标志物的高成熟轻质油/凝析油来说,及其烷基取代系列是进行油源判识的有效分子标志物。Oils from the Lower Cambrian 1w Wusonggeer Formation dolomite reservoirs were found in Well ZS5 in the Tazhong Uplift of the Tarim Basin. The oils are characterized by low freezing point, low viscosity and low sulfur content. They belong to waxy light oils. This study analyzed the distribution patterns of chrysene, benzo[a]anthracene and alkyl-substituted series in crude oils from wells ZS5, ZS 1 and ZS 1C. The composition of chrysene, benzo[a]anthracene and carbon isotopic analyses were also made for the representative Cambrian and Upper Ordorvician source rocks from the cratonic region of the Tarim Basin. It is shown that oils from wells ZS5 and ZS1 are characterized by low abundances of benzo[a]anthracene and methylbenzo[a]anthracene relative to ehrysene and methylchrysenes, and low δ13C values. The case is consistent with that of organic matter from the Upper Ordovician source rocks. In contrast, crude oils from Well ZS1C are characterized by relatively high abundances of benzo[a]anthracene and methylbenzo[a]anthracene, and high δ13C values, which can be correlated with those of organic matter from the Cambrian source rocks in the cratonic region of the Tarim Basin. For the lack of conventional steroids and terpenes in light oils or condensates with high maturity, chrysene and alkyl-substituted homologues can be used as effective molecular markers.

关 键 词：中深5井 [艹屈] 苯并[a]蒽 甲基[艹屈] 塔里木盆地 

分 类 号：P593[天文地球—地球化学] P599[天文地球—地质学]