塔里木盆地巴楚隆起泥盆系东河砂岩成岩作用研究

Diagenesis of Devonian Donghetang sandstones in Bachu Uplift, Tarim Basin

李建交 曹自成 岳勇

Li Jianjiao Cao Zicheng Yue Yong

中国石油化工股份有限公司石油勘探开发研究院, 北京 100083 2. 中国石油化工股份有限公司西北油田分公司, 乌鲁木齐 841000

SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China 2. SINOPEC Northwest Company, Urumqi, Xinjiang 841000, China

通过对塔里木盆地巴麦地区多口典型探井泥盆系东河塘组薄片的观察与鉴定,东河塘组石英含量高,长石和岩屑含量都在1%～4%范围,成分成熟度高;主要的成岩作用有压实作用、胶结作用、溶蚀(溶解)作用等.综合判断认为,泥盆系东河砂岩处在中-晚成岩阶段,原生孔隙少,表生成岩溶解作用和埋藏溶蚀作用可以溶解多种可溶性杂基和碳酸盐岩类基质,使储层发育粒内溶孔、铸模孔、溶蚀扩大等孔隙类型.但是由于储层成岩作用过程有叠置,所以储层的改善作用也有限,物性相对较差.

The thin sections of Devonian Donghetang sandstones from several typical wells in Bachu-Maigaiti area of the Tarim Basin were observed.In the Donghetang Formation,quartz was in high content while feldspar and lithic ranged from 1% to 4%,standing for high maturity.The main diagenetic effects included compaction,cementation,dissolution (dissolving) and so on.Devonian Donghetang sandstones were during the middle and late stages of diagenesis.Few primary pores and fissures were found.Epidiagenetic dissolution and burial dissolution dissolved a variety of soluble and carbonate rocks,resulting in intragranular dissolved pores,moldic pores and enlarged dissolved pores.However,since the process of diagenesis was superimposed in the study area,the improvement of reservoir was limited and the physical property of Devonian Donghetang Formation was poor.

国家重大专项“塔里木盆地碎屑岩油气富集规律及勘探目标研究”(2008ZX05002-003-006)资助

https://doi.org/10.11781/sysydz201202125