塔河油田塔深3井区奥陶系深层油气成藏的地球化学证据

发布时间：2018-02-01 00:36

本文关键词： 包裹体成藏期次地球化学奥陶系深层塔河油田　出处：《石油实验地质》2017年03期 　论文类型：期刊论文

【摘要】：塔深3井是塔河油田首次在奥陶系深层获得油气突破的探井,在奥陶系中—下统鹰山组上段获得高产油流。塔深3井区奥陶系深层的原油物性和该区顶部风化壳型油藏一致,均为高凝固点、高硫、高蜡、高黏度的超重质原油。原油中正构烷烃系列分布完整,但色谱基线出现不同程度的抬升;原油中普遍含有25-降藿烷系列;饱和烃和沥青质的碳同位素出现明显的"倒转"现象,这些特征均表明该区至少经历了2期油气充注成藏作用。同时,在塔深3井鹰山组的储层方解石中检测到发黄色、黄绿色、蓝色荧光的油包裹体和气包裹体,根据包裹体的均一温度判断存在3期油气充注,分别为:加里东晚期—海西早期、海西晚期及喜马拉雅晚期。结合井区原油现今的物性(超重质油)及成熟度(成熟油)分析,应以第一期原油充注为主。
[Abstract]:Well Tashen 3 is the first oil and gas breakthrough in the Ordovician deep layer in Tahe Oilfield. A high oil flow was obtained in the upper member of Yingshan formation of middle and lower Ordovician series. The crude oil physical properties of the deep layer of Ordovician in Tashen 3 well area are consistent with those of weathered crust reservoirs at the top of the Ordovician system, all of which are high solidification point, high sulfur and high wax. Heavy crude oil with high viscosity. The normal alkane series in crude oil is distributed completely, but the chromatographic baseline is uplifted to some extent. The crude oil contains 25- norcariane series; The carbon isotopes of saturated hydrocarbon and asphaltene show obvious "inversion" phenomenon, which indicates that the area has experienced at least two periods of hydrocarbon accumulation and accumulation. Oil inclusions and gas inclusions with yellow, yellowish green and blue fluorescence were detected in reservoir calcite of Yingshan formation in well Tashen 3. According to homogenization temperature of inclusions, there were 3 stages of oil and gas filling. They are: late Caledonian to early Hercynian, late Hercynian and late Himalayas. According to the present physical properties (super heavy oil) and maturity (mature oil) of crude oil in the well area, the first stage of crude oil filling should be the main one.
【作者单位】：中国石化西北油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计划(973计划)项目“中国下古生界大型油气田保存条件与分布预测”(2012CB214806) 中国石化科技部科技攻关项目“塔河油田深层储层成因、成藏规律与目标优选”(P15030)联合资助
【分类号】：P618.13
【正文快照】： 中国石化西北油田分公司自2001年开始探索塔河深层领域,至2012年十二年间相继部署的沙88、塔深1、于奇6、艾丁11及塔深2井在寒武系上统、奥陶系下统蓬莱坝组及中—下统鹰山组下段均见到了不同程度的油气显示,但均未获得油气突破。2014年,针对奥陶系深层部署的塔深3井在揭开奥

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