鄂尔多斯盆地上古生界深盆气藏流体动力学特征及成藏过程分析  

ANALYSIS ON FLUID DYNAMICS AND FORMATION PROCESS OF DEEP BASIN GAS TRAP IN UPPER PALEOZOIC OF THE ORDOS BASIN

作　　者：朱蓉[1] 楼章华[1] 金爱民[1] 魏新善[2] 

机构地区：[1]浙江大学水利与海洋工程学系,杭州310028 [2]长庆石油勘探局勘探开发研究院,西安710021

出　　处：《地质科学》2003年第1期31-43,共13页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家"973"重点基础研究项目 ( 2 0 0 1CB2 0 91 0 4 );"95"攻关项目 ( 95-1 10- 0 1-0 3)资助课题。

摘　　要：鄂尔多斯盆地上古生界气田是一个在向西低角度倾斜背景下形成的深盆气田。在深盆气田的形成过程中 ,部分天然气伴随离心流漏失。天然气往储层上翘一侧有侧漏是深盆气藏的重要特征之一。在鄂尔多斯盆地 ,由于储层十分致密 ,地下水的流动补给十分缓慢 ,随着天然气的不断漏失 ,逐渐形成低压。另外 ,天然气的运移速度十分缓慢也有利于深盆气藏的保存。The Upper Paleozoic reservoirs were of low permeability and a gently west-dipping slope in the Ordos Basin, and the gas field being deep basin gas trap. The meteoric water flowed, induced by gravity, from the northern and eastern basin edges into the interior, but the gas flowed from the west to the east, some of which would escape upwards, making up the present kinetic models of underground fluids.With the buried depth increasing, gas and mudstone-compacted water permeated the reservoirs, resulted in high abnormal fluids pressures, and gas could dissolute into formation water. As the gas concentration increased, or bed erosion or buried depth decreased during formation water flowing, fluid pressures decreased. The gas was freed from water and the deep basin gas field created, some of them escaped upwards along the formation water flow directions, which was a typical characteristics of deep basin gas field. Due to low permeability, the recharge of formation water could be very slowly, and gas escaping could induce low abnormal fluid pressures. In the meantime, the gas flow could migrate slowly since its low permeability, and the deep basin gas field could be preserved.

关 键 词：鄂尔多斯盆地 上古生界 深盆气藏 流体动力学 成藏过程分析 天然气 

分 类 号：P618.130.2[天文地球—矿床学]