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Geochemical characteristics and origin patterns of oils in periphery of southwestern Tarim Basin
Author(s): 
Pages: 1221-1233
Year: Issue:  10
Journal: Acta Petrolei Sinica

Keyword:  crude oil groupoil-source correlationgeochemistrybiomarkerssouthwestern Tarim Basin;
Abstract: 塔西南坳陷及其周缘是塔里木盆地重要的油气勘探战略接替区和新的储量增长点.伴随近年该区油气勘探活动中重要井位的突破,油气勘探显示十分明显的增长前景,成为重要的勘探和研究焦点.选取塔西南地区巴什托-亚松迪油气田、柯克亚油气田、喀什凹陷和玉北地区共32件原油和油砂进行原油族组成、原油气相色谱、色谱-质谱和碳同位素分析,厘定塔西南原油和油苗样品的典型地球化学特征,对原油进行精细划分并族群,揭示原油的成因类型.研究认为:塔西南麦盖提周缘地区识别出巴什托原油族群、柯克亚原油族群、克拉托原油族群和玉北原油族群.琼002井、琼003井、群5井、群7井等属巴什托原油族群,BT4井、曲1井和琼003井位于色力布亚断裂逆冲断裂带下盘,可能受深部寒武系等烃源层烃源贡献的影响,地球化学特征与巴什托主体原油显示差异性,但仍属于巴什托族群,BT2井分子地化特征与巴什托主体原油具明显差异,其位于色力布亚断裂带上盘,可能为寒武系烃源贡献.巴什托原油与LN46井和TZ30井所采集的典型台盆区奥陶系烃源岩具可对比性,可能存在石炭系烃源岩的贡献,为混源油气藏;饱和烃气相色谱显示其为至少2期充注.柯东1井属柯克亚原油族群,油-源对比显示,柯克亚原油与侏罗系烃源岩具良好对比性.喀什凹陷原油与油砂存在差异,原油来自中下侏罗统康苏组和杨叶组烃源岩具可比性,克拉托油砂与下石炭统烃源岩可比.玉北地区的YB1井和YB1-2X井与巴什托原油族群地化特征具有可比性.丰富的油气显示与多套烃源层的复杂成因关系揭示塔西南地区油气勘探具有广阔的勘探前景.
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