石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (3): 420-429.doi: 10.11743/ogg20110315

• 石油与天然气地质 • 上一篇    下一篇

塔里木盆地轮古地区轮深2井蓬莱坝组沥青浸染样式

  

  • 出版日期:2011-06-28 发布日期:2011-09-23

Bitumen impregnation patterns of the Lower Ordovician Penglaiba Formation in Well Lunshen-2 in Lungu area,the Tarim Basin

  • Online:2011-06-28 Published:2011-09-23

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摘要：

摘要：在塔里木盆地轮古地区，轮深2井下奥陶统蓬莱坝组岩心存在大量的沥青浸染。通过详细观察下奥陶统蓬莱坝组两个回次的岩心，认为存在6种类型的沥青浸染样式。它们分别是：沿着水平纹层浸染、沿着微裂缝纹层复合浸染、沿着裂缝浸染、沿着溶孔浸染、沿着压溶裂缝浸染以及沿着拉分空间块状浸染。不同类型的沥青浸染样式具有不同的成因以及油气富集意义。这些现象说明蓬莱坝组曾经有过油气充注历史，由于富集空间类型的差异使得沥青样式出现不同类型。通过轮深2井蓬莱坝组白云岩的沥青浸染样式分类以及储层成因意义分析，可以为该地区白云岩储层精细表征提供地质依据。研究认为硅质岩是导致蓬莱坝组钻时增大的主要原因，同时蓬莱组实际取心沥青浸染样式可以说明之前预测的“串珠”状白云岩储层不是有利储层。

关键词: 关键词：沥青, 浸染样式, 白云岩储层, 轮深2井, 蓬莱坝组, 下奥陶统, 塔里木盆地

Abstract:

Abstract: Bitumen impregnations is common in cores of the Lower Ordovician Penglaiba Formation of Well Lunshen-2 in Lungu area,the Tarim Basin.Through detailed observation of two cored intervals in the Formation,it is inferred that there exist six types of bitumen impregnation patterns,i.e.lamination impregnation,fissure and lamination composite impregnation,fracture impregnation,vug impregnation,irregular stylolite impregnation,and pullapart space impregnation.Different types of bitumen impregnations have different origins and hydrocarbon accumulation significances.It is indicated that the Penglaiba Formation experienced hydrocarbon charging and the different types of bitumen impregnation were caused by the differences of space types for hydrocarbon enrichment.The recognition of bitumen impregnation patterns and analysis of their relationship with reservoir genesis provide a geological basis for fine characterization of the dolomite reservoirs in the study area.Study shows that the silicate in the Penglaiba Formation is the main factor leading to the increase of drilling time and the previously predicted “catenular” dolomites are not favorable reservoirs.

Key words:  , Key words： bitumen,impregnation pattern,dolomite reservoir,Well Lunshen-2,Penglaiba Formation,Lower Ordovician,Tarim Basin