海拉尔盆地赫尔洪德凹陷塔木兰沟组和铜钵庙组油源分析  

Oil-source analysis of Tamulangou Formation and Tongbomiao Formation in Helhongde Sag of Hailar Basin

作　　者：杨旭[1] 彭威[1] 申文静[1] 李敬生[1] 杨楠[1] YANG Xu;PENG Wei;SHEN Wenjing;LI Jingsheng;YANG Nan(Exploration and Development Research Institute of Daqing Oilfield Co Ltd, Daqing 163712, China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2021年第3期33-41,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“大庆油气持续有效发展关键技术研究与应用”(2016E-0202)。

摘　　要：海拉尔盆地赫尔洪德凹陷H井侏罗系塔木兰沟组发现的高产油流展示了该凹陷侏罗系的勘探潜力。目前对原油的来源尚没有统一的认识,为了有效预测油气藏和明确勘探方向,运用族组成、生物标志化合物、油-源对比等分析指标,对塔木兰沟组原油、铜钵庙组油砂进行了油源对比研究。对H井铜钵庙组油砂、塔木兰沟组原油及南屯组一段、铜钵庙组、塔木兰沟组泥岩开展的族组分含量、生物标志化合物等研究表明,塔木兰沟组原油与塔木兰沟组烃源岩各方面地化特征最为接近,正构烷烃呈单峰分布,主峰碳为nC21;生物标志化合物中具有较高三环萜烷;规则甾烷构型均呈不对称“V”字形分布特征,具有较高的成熟度,反映出二者具有良好的亲缘关系,而与铜钵庙组暗色泥岩及南屯组一段暗色泥岩对比性较差,亲缘关系不明显,因此,认为H井塔木兰沟组原油主要来自塔木兰沟组烃源岩。铜钵庙组油砂与铜钵庙组烃源岩各方面地化特征最为接近,正构烷烃呈单峰分布,低碳数占优,主峰碳为nC21;生物标志化合物中C30藿烷优势明显;规则甾烷构型均略呈反“L”字形分布特征,以C29为主;油砂与烃源岩成熟度相近,反映出两者具有良好的亲缘关系,而与下部的塔木兰沟组烃源岩及南屯组一段暗色泥岩对比性较差,亲缘关系不明显,因此,认为H井铜钵庙组油砂中的原油主要来自铜钵庙组烃源岩。The high-yield oil flow discovered in Jurassic Tamulangou Formation in Well H of Helhongde Sag in Hailar Basin displays the exploration potential of Jurassic system.Until now,there’s no consensus on the source of the crude oil.In order to effectively predict the oil reservoirs and clarify the exploration direction,the analysis indicators of group compositions,biomarkers and oil-source correlation were used to carry out the oil-source comparison between the crude oil in Tamulangou Formation and the oil sand in Tongbomiao Formation.Based on oil sand in Tongbomiao Formation,crude oil in Tamulangou Formation and mudstones in the first member of Nantun,Tongbomiao and Tamulangou Formations in Well H,the study on group composition content and biomarker shows that the geochemical characteristics between the crude oil in Tamulangou Formation and the source rock in Tamulangou Formation are the most similar in all aspects.The distribution of n-alkanes is uni-modal and the main peak carbon is nC.There are high amounts of tricyclic terpanes among the biomarkers.The configurations of both regular steranes are asymmetric“V”shape with high maturity,reflecting that they have a good genetic relationship.On the contrary,there is rather poor correlation with the dark mudstones in Tongbomiao and Nantun Formations without obvious genetic relationship.Therefore,it’s believed that the crude oil of Tamulangou Formation in Well H mainly comes from the source rocks of Tamulangou Formation.The oil sand in Tongbomiao Formation and the source rock in Tongbomiao Formation are the closest in all respects of geochemical characteristics.The distribution of the n-alkane is uni-modal with the predominance of low carbon number,and the main peak carbon is nC.Among the biomarkers,C hopane has obvious advantages.All regular sterane configurations are characterized by slightly inverse L-shaped distribution,and the main peak carbon is dominated by C.The maturity between oil sand and source rock is similar,which indicates that they have a good gen

关 键 词：生物标志化合物 油源对比 塔木兰沟组 铜钵庙组 赫尔洪德凹陷 海拉尔盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]