沉积盆地内多套水动力系统的并存及对地层压力评价的影响——以云南楚雄盆地云龙凹陷云参1井为例  

The co-existing of more hydrodynamic systems in sedimentary basin and its influences on evaluation of formation pressure——For an example of Yuncan 1 well from Yunlong depression,Chuxiong basin,Yunnan province

作　　者：王震亮[1] 张立宽[2] 

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]西北大学地质学系

出　　处：《中国科技论文在线》2007年第7期457-462,共6页

基　　金：国家重点基础研究发展规划(2001CB209103);教育部"长江学者和创新团队发展计划""能源盆地油气地质"(IRT0559);中国石化中石化南方勘探开发分公司联合资助

摘　　要：水动力分析已经成为油气地质研究中的重要内容。过去常用的地层压力表达方式有一个基本前提,即水力输导层相互连通,地势与水势面基本一致。当盆地内多个水动力系统并存且相互分隔时,如何衡量一个地区或地层的压力大小,日前还是一个薄弱环节。本文以楚雄盆地钻井的实测地层压力分布为基础,对云参1井的异常低压成因进行了探讨。根据水文地质条件分析,认为存在多套压力系统。扣除不承压地层的影响后,对地层压力进行了重新评价,计算结果显示为静水压力。本文的研究结果为在地表沟壑纵横、地下多个水动力体系并存的中国西部盆地内进行地层压力评价,提供了一个新思路。The analysis on hydrodynamic conditions is being an important contents in petroleum geology research. There is a basic premise in usual style of expressing formation pressure that the hydro-carrier beds are connected mutually, and there are inconsistant basiely between topography relief and surface of water potential. However, how to measure the aplitude of pressure in a area or a statium, in which more hydrodynamic systems are co-exsited in a basin and seperated mutually, is still a weak link. In this paper, the origin of abnormal low pressure from Yuncan 1 well is probed on the basis of distribution of measured formation pressure in drills from Chuxiong basin. It is conclude that there are more pressure systems according to analysis on hydrogeological conditions. The formation pressure is re-evaluted indicating the result of hydrostatic pressure, after deducting the influnce of non-pressred strata. The researhed resluts in this paper would provide a new thought for the evalution of formation pressure in western China basins, in which developing many boulder-stream gullies in topography, and co-existing many underground hydrodynamic systems.

关 键 词：水动力系统 异常低压 地层压力评价 沉积盆地 

分 类 号：P618.13[天文地球—矿床学]