柴达木盆地德令哈断陷油气运聚特征
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摘要
通过对德参1井资料的系统分析并结合野外考察及地震勘探等成果,对柴达木盆地德令哈断陷油气运聚特征进行了研究,认为德参1井的油气来源于下伏中下侏罗统或石炭系,区域盖层主要为3000～3860m的N1-E3上部地层,在此层位以上地层中由于缺乏有效油气盖层而难以形成油气藏,油气勘探目的层应该是此层段以下的E3中下部地层及侏罗系。4000m以下的岩心分析发现砂岩孔隙发育、面孔率高、孔隙中见沥青质,表明储集层物性较好,曾有过油气运聚。3082~3487m存在多处裂缝发育段,它可成为潜在的油气储集空间。4172~4380m为上侏罗统的一个储盖层组合段,该组合中砂岩可能含有天然气。
By systematic analysis of Decan-1 Well is systematically analyzed integrated with information from the field outcrop reviews and the seismic prospecting, the hydrocarbon and accumulation of Delingha fault depression in Qaidam basin is studied. It is proved that the oil and gas in Decan-1 Well was originated from the underlying Middle-Lower Jurassic or Carboniferous, and the N1 to the upper E3 are the regional cap formation in depth of 3 000~3 860 m, but it is hard to form oil-gas pools in overlying strata due to lack of effective caprocks. Hence, the petroleum exploration targets should be in the underlying Middle-Lower E3 and Jurassic beds. The core analysis from depth of 4 000 m indicates that the sandstone reservoir is of better quality with porosity-developed sandstone, good storage capability and some asphaltic seepage, showing that petroleum migration had ever happened here. The existence of multi-fractural zones in 3 082~3 487 m suggests that the potential reservoir spaces could be shaped in them. The strata of 4 172~4 380 m is a combination of reservoir-cap formation of Upper Jurassic,within which natural gas could be found in its sandstone.
By systematic analysis of Decan-1 Well is systematically analyzed integrated with information from the field outcrop reviews and the seismic prospecting, the hydrocarbon and accumulation of Delingha fault depression in Qaidam basin is studied. It is proved that the oil and gas in Decan-1 Well was originated from the underlying Middle-Lower Jurassic or Carboniferous, and the N1 to the upper E3 are the regional cap formation in depth of 3 000~3 860 m, but it is hard to form oil-gas pools in overlying strata due to lack of effective caprocks. Hence, the petroleum exploration targets should be in the underlying Middle-Lower E3 and Jurassic beds. The core analysis from depth of 4 000 m indicates that the sandstone reservoir is of better quality with porosity-developed sandstone, good storage capability and some asphaltic seepage, showing that petroleum migration had ever happened here. The existence of multi-fractural zones in 3 082~3 487 m suggests that the potential reservoir spaces could be shaped in them. The strata of 4 172~4 380 m is a combination of reservoir-cap formation of Upper Jurassic,within which natural gas could be found in its sandstone.
引文
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[6]甘贵元,尹成明,张冰清,等.柴达木盆地油气资源战略调查成果与下步工作重点[J].地质通报,2006,25(9-10):1068-1073.
[7]文志刚,王正允,何幼斌,等.柴北缘下奥陶统烃源岩有机地球化学特征[J].天然气工业,2004,24(4):7-9.
[8]甘贵元,严晓兰,赵东升,等.柴达木盆地德令哈断陷石油地质特征及勘探前景[J].石油实验地质,2006,28(5):499-503.
[2]王明儒,胡文义.柴达木盆地北缘侏罗系油气前景[J].石油勘探与开发,1997,24(5):20-24.
[3]胡受权,曹运江.柴达木盆地侏罗纪盆地原型及其形成与演化探讨[J].石油实验地质,1999,21(3):189-195.
[4]汤良杰,金之钧,张明利,等.柴达木盆地北缘构造演化与油气成藏阶段[J].石油勘探与开发,2000,27(2):36-39.
[5]薛光华,杨永泰.柴达木盆地北缘油气分布规律研究[J].石油实验地质,2002,24(2):141-146.
[6]甘贵元,尹成明,张冰清,等.柴达木盆地油气资源战略调查成果与下步工作重点[J].地质通报,2006,25(9-10):1068-1073.
[7]文志刚,王正允,何幼斌,等.柴北缘下奥陶统烃源岩有机地球化学特征[J].天然气工业,2004,24(4):7-9.
[8]甘贵元,严晓兰,赵东升,等.柴达木盆地德令哈断陷石油地质特征及勘探前景[J].石油实验地质,2006,28(5):499-503.
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