物源对子洲气田山_2段储层的影响

Provenance effects on reservoir of member Shan2 in Zizhou gasfield

子洲及周边地区下二叠统山2段物源来自鄂尔多斯盆地北缘阴山古陆中-东部,中-东部物源可分为两个区,各通过一条水系携带沉积物向南部盆地充填。文章从储层物性、砂岩类型及长石矿物方面分析,并与周边气田对比,论证了子洲地区主要受榆林物源影响,同时有米脂物源汇入。结合子洲地区物源与储层物性关系研究,认为榆林物源对子洲储层物性有利,而米脂物源含有较多软岩屑,造成子洲地区物性变差。此认识对子洲气田扩边潜力分析具有参考意义。

Provenances of the Shan 2 member of lower permian in Zizhou and the surrounding areas come from middle-eastern area of Yinshan ancient land in the ordos basin＇north,middle-eastern provenances can divide into two areas,both areas by each river system carried sediment to fill southern basin.The paper analyses the reservoir physical property, the types of sandstone and feldspar mineral,then comparing the surrounding gasfield, and demonstrating that Zizhou area was mainly affected by provenance of Yulin, at the same time, joining it from source of Mizhi.By studying relation between Zizhou area source and reservoir physical property, realizing that Yulin source is beneficial to Zizhou reservoir property, and Mizhi source contains more rock debris causing Zizhou physical property worse.The understanding has references for potential extension of Zizhou gasfield.