榆林—绥德地区上古生界现今压力系统  

Present pressure system of the Upper Paleozoic in the Yulin-Suide area,Ordos Basin

作　　者：王晓梅[1,2] 姚泾利[3] 赵靖舟[1,2] 曹青[1,2] 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]中国石油长庆油田分公司,陕西西安710021

出　　处：《西北大学学报（自然科学版）》2016年第6期887-892,共6页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技重大专项基金资助项目(2011ZX05007-004);陕西省教育厅油气成藏地质学重点实验室基金资助项目(16JS088);西安石油大学青年科技创新基金资助项目(2015BS07)

摘　　要：勘探与开发实践表明,榆林—绥德地区上古生界压力系统复杂,搞清其现今压力系统的分布特征对气藏评价、成藏机理研究以及气藏开发等具有重要意义。该文根据实测地层压力资料剖析了研究区上古生界压力的纵向和横向分布特征,并在此基础上,以子洲气田山2段为例,采用压力梯度曲线法划分了其压力系统,并探讨了储层非均质性对现今压力系统分布的控制作用。研究认为,研究区上古生界现今地层压力是以常压为主,多种压力类型并存;子洲气田山2段可初步划分为9个压力系统,单个压力系统分布面积小,压力系统之间流体互不连通;子洲气田储层非均质性严重,为压力系统提供了不渗透边界。It has been showed by exploration and development practices that the present pressure system of the Upper Paleozoic in the eastern Ordos Basin is complex. To clarify the distribution characteristics of pressure system is significant for the evaluation of gas reservoir rules, the study of accumulation mechanism and gas de- velopment. By detailedly selecting the existing formation pressure data, the vertical and horizontal pressure distribution features of the Upper Paleozoic have been concluded in study area. Mainly according to pressure gradient curve method, the pressure system of the 2nd Member of Shaanxi Formation in Zizhou gas field has been divided. The conclusions have been drawed by the research as follows. Firstly, there are various kinds of pressure type in study area, but normal pressure type is common. Secondly, Zizhou gas field can be divided into nine pressure systems, and the extent of single pressure system is small, the fluid in different pressure systems is disconnected. Finally, serious reservoir heterogeneity of Zizhou gas field served as the impermeable boundary for pressure systems.

关 键 词：压力梯度 压力系统 上古生界 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]