靖边气田南部古岩溶特征及有利储层发育  

Paleokarst characteristics and the favorable reservoirs development in southern Jingbian gasfield

作　　者：夏勇[1,2] 刘海锋[1,2] 袁继明[1,2] 王华[1,2] 王彩丽[1,2] 

机构地区：[1]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [2]中国石油长庆油田公司勘探开发研究院,陕西西安710018

出　　处：《东北石油大学学报》2013年第6期25-31,6-7,共7页Journal of Northeast Petroleum University

基　　金：中国石油天然气集团公司重大科技专项(2011E-1306)

摘　　要：为研究靖边气田南部的有利储层发育规律,在识别古岩溶形迹标志的基础上,分析岩溶垂向分带和平面展布特征及古岩溶与储层发育的关系.结果表明:古岩溶纵向可划分为残积带、垂直渗流带、垂直水平渗流过渡带、水平径流带、未溶蚀或弱溶蚀带等;古地貌由西向东依次为西部剥蚀高地、中部低缓斜坡、东部岩溶洼地,具有"西高东低、中东部地势低缓、深沟相对不发育"的特点,岩溶水径向流"东西强、中部弱",自西向东溶蚀强度逐渐减弱、风化壳厚度逐渐变薄.岩溶作用类型及强度决定不同分区储层的纵向分布,岩溶古地貌形态及储盖组合形式控制储层展布特征,西部古残丘、中东部沟槽翼部是储层发育的有利区.该认识对靖边气田天然气勘探开发具有指导意义.For figuring out the favorable reservoirs development rules in southern Jingbian gasfield,the vertical zoning,plane distribution and the relationships between karstification degree of paleokarst and the reservoir development were further analyzed on the basis of the study of identification palaeokarst trail signs.The results suggest that vertical karst profile can be divided into residual zone,vertical infiltration karst zone,the vertical-horizontal flow transition zone,horizontal subsurface karst zone and weak corrosion zone etc.There developed three geomorphic units from west to east,western karst highland,central karst slope and eastern karst depression,which are characterized by the fact that'western is high and eastern is low,the eastern area is low-lying and gently sloping,and deep trenches are under-developed'.The rate of karst water flow is high-speed in western-eastern area and slowly in the central area,the erosion intensity is gradually weakening and the weathered crust is gradually thinning form west to east.Karst type and intensity determined the vertical distribution of reservoir,palaeokarst Landform and reservoir-cap combination controlled to the reservoir distribution characteristics.It is the favorable area for development reservoirs where near the trench and karst remnant hills flanks.This view is of guiding significance for the gas exploration and development.

关 键 词：古岩溶特征 岩溶地貌 有利储层发育 马家沟组 靖边气田南部 

分 类 号：TE112.23[石油与天然气工程—油气勘探]