准噶尔盆地乌夏地区三叠系成岩作用及其影响因素  

Diagenesis of Triassic reservoir in Wuxia area of Junggar Basin and its influencing factors

作　　者：牛海青[1] 陈世悦[1] 韩小锋[2] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东东营257061 [2]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《西安石油大学学报（自然科学版）》2010年第2期6-12,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中国石油科技攻关项目"准噶尔盆地乌-夏断裂带精细勘探潜力研究"(编号:B20060104)

摘　　要：准噶尔盆地乌夏地区三叠系发育冲积扇、扇三角洲、湖泊相等沉积类型的砂砾岩体,地层埋深变化大,成岩作用复杂.对其成岩作用过程的研究结果表明,乌夏地区三叠系储层经历了压实、胶结、溶蚀等多种成岩作用,目前多处于早成岩B亚期和中成岩A亚期成岩阶段,储层的孔隙演化与成岩作用密切相关,早期的压实作用和胶结作用是使原生孔隙遭受破坏的成岩作用类型;中成岩A期,有机质成熟产生有机酸使次生孔隙发育,储层物性有所改善;后期自生胶结物的充填作用是次生孔隙遭受破坏的主要原因.研究表明沉积环境、岩石成分、孔隙流体性质及构造应力是该区成岩作用的主要影响因素,并间接影响储层物性发育,这对预测本区三叠系储层物性的空间分布具有重要意义.The sandbodies of alluvial fan,fan delta and lake facies develop in Triassic reservoir in Wu-xia area of Junggar Basin.Their diagenesis is very complex because of the difference in their buried depth.The research of the diagenesis of the reservoir shows that the reservoir experiences compaction,cementation and dissolution,and at present,the diagenesis of the reservoir rock is in B-substage of eraly diagenesis and A-substage of middle diagenesis.The pore evolution of the reservoir is closely related with the reservoir diagenesis.In the early diagenesis,compaction and cementation are the main factors of destroying primary pores;in the A-substage of middle diagenesis,the organic acid produced by the maturation of organic matter makes the secondary pores develop,which improves the physical property of the reservoir;while in the late stage of dianenesis,the filling of authigenic cements makes the secondary pores be destruct.The study also shows that sedimentary environment,rock composition,the property of pore fluid and tectonic stress are the main factors of affecting the diagenesis of the reservoi.These factors also indirectly affect the pore development of the reservoir,which is important to the prediction of the property of the Triassic reservoir in the studied region.

关 键 词：准噶尔盆地 乌夏地区 三叠系 成岩作用 孔隙演化 影响因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探]