海拉尔盆地乌尔逊凹陷大下段泥岩盖层的封闭性  

Caprock sealing ability of D_1 in Wuerxun of Hailaer

作　　者：高胜利[1] 杨金侠[2] 王映辉[3] 

机构地区：[1]中国石油长庆油田公司勘探开发研究院,陕西西安710021 [2]陕西师范大学数学与信息科学学院,陕西西安710062 [3]陕西师范大学计算机科学学院,陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2004年第1期102-105,共4页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家863重大专项基金资助项目(2003AA118105)

摘　　要：通过确定海拉尔盆地乌尔逊凹陷声波时差与泥岩排替压力、声波时差与泥岩孔隙流体压力之间的函数关系,利用大量的声波时差资料研究了该区域泥岩盖层毛细管封闭和压力封闭能力.研究结果表明:该地区泥岩盖层有着纵横向上的封闭性特征;纵向上排替压力和过剩孔隙流体压力高值区一般出现在大下段地层;横向上乌北地区排替压力高、过剩孔隙流体压力低,排替压力高值区出现在西北部;而在乌南地区,排替压力低、过剩孔隙流体压力高,过剩压力高值区集中分布在东部,且明显高于乌北地区.Through determining the function relationship between acoustic interval transit time and mud entry pressure, acoustic interval travel time and mud porous-fluid pressure, using much data of acoustic interval transit time,the seal ability of mud roof rock′s capillary seal force and pressure seal are researched in Wuerxun of Hailaer basin. The article analyses the mud seal rock′s seal characteristics of capillary sealing and porous-fluid pressure in vertical and plane,and then draw a conclusion that the high place of the portrait entry pressure and overmuch porous-fluid pressure usually occur in D1 member;In plane the orientation entry pressure is high and the porous-fluid pressure is low in north Wuerxun ,and the high entry pressure occurred in the place of the northwest.But in south Wuerxun, the orientation entry pressure is low and the overmuch porous-fluid pressure is high, the high place of overmuch pressure centralize in east of this area and overmuch porous-fluid pressure is obvious higher than that of in north Wuerxun.

关 键 词：海拉尔盆地 乌尔逊凹陷 声波时差 异常孔隙流体压力 排替压力 毛细管封闭能力 函数关系 

分 类 号：P628.3[天文地球—地质矿产勘探]