摘要
煤系地层的成岩演化一般都会导致酸性成岩环境,但是对库车坳陷东部吐格尔明背斜构造带内下侏罗统阿合组粗碎屑岩中普遍存在的石英和方沸石溶蚀现象的研究表明,阿合组粗碎屑岩在成岩演化的早期阶段经历过由酸性向较强的碱性成岩环境过渡的过程,碱性环境下的钙质胶结物占据了碎屑颗粒之间的原生孔隙并提高了岩石的抗压实能力。后期的风化淋滤使钙质胶结物被溶解,从而使原生孔隙释放出来,导致该地区阿合组储集岩的物性普遍较好。因此,成岩阶段的碱性环境对阿合组碎屑岩储集层物性的后期改善具有重要作用。
Diagenetic evolution of the coal measure strata usually results in the acidic diagenetic environment,but the quartz and analcime dissolutions in the coarse clastic rocks of Ahe formation of the Lower Jurassic in Tugeerming anticlinal structural belt in eastern Kuqa depres-sion suggest that the stronger alkaline diagenetic environment probably exists during its early stage of diagenetic evolution.Calcite cement formed in the alkaline environment holds the original interstice between the clastic grains and strengthens the compactibility-resistance of the clastic rocks.In the late stage,calcite cements are dissolved due to weathering and eluviation,and the original interstices are released and the reservoir property of Ahe formation becomes better.For this reason,the alkaline diagenetic environment in the early stage plays an important role in improving the reservoir property of Ahe clastic rocks.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第4期356-358,共3页
Xinjiang Petroleum Geology
关键词
塔里木盆地
库车坳陷
吐格尔明背斜构造带
阿合组
碱性成岩环境
储集层物性
Tarim basin
Kuqa depression
Tugeerming structural belt
Ahe formation
Alkaline diagenetic environment
reservoir property
