中国岩溶Issue(3)：373-378,6.
塔北隆起轮古7井区奥陶系岩溶地貌及岩溶储层特征研究
Karst landforms and reservoir characteristics in the Ordovician strata of Lungu 7,Tabei uplift
摘要
Abstract
The Tabei uplift of the Tarim basin is one of the three largest ancient uplifts.Lungu7 well block is located in the northern uplift in Lunnan buried hill in the primary geomorphic unit karst highland,high area of Lunnan low raise.It is rich in oil and gas resources,and the Ordovician carbonates are one of the richest oil-bearing series,and one of the main formations for exploration and development.The different geomor-phic units control the ancient hydrodynamic conditions,and further determine the diversity of karst develop-ment.Therefore,the precise shape of the karst paleogeomorphology is of great significance for the reasona-ble arrangement of high production and efficient wells. <br> This study uses the relative residual thickness method to characterize ancient karst landforms and ancient hydrodynamic conditions.Two types of secondary geomorphic unit are classified,karst highland and karst slope.Furthermore,six types of tertiary geomorphic unit are classified after the precise description of the secondary geomorphic unit on the basis of combinations of micro-geomorphologic landforms. <br> Through further research on the karst reservoir distribution pattern,this study considered that the res-ervoir volume is mainly comprised of secondary solution pores,corrosion cracks and cave systems,formed by later structure and karstification.According to the combined characteristics of the holes,caves and seams,as well as the relationship between fracture porosity and hole porosity,the Ordovician Yingshan karst reser-voirs are divided into four types,fracture,hole,crack-hole,and cave. <br> Compared to karst slopes,karst highlands more easily preserve karst reservoir space due to stronger de-nudation.The karst slope zone easily forms a large fracture-cave cube because of it strong hydrodynamic con-ditions,well-developed karst piping system and good connectivity.It can be treated as karst cave reservoir, which provides the basis for future exploration and development.关键词
古地貌/岩溶储层/岩溶分带/塔北隆起Key words
ancient landform/karst reservoir/karst zonation/Tabei uplift分类
天文与地球科学引用本文复制引用
张庆玉,秦凤蕊,梁彬,曹建文,淡永,李景瑞..塔北隆起轮古7井区奥陶系岩溶地貌及岩溶储层特征研究[J].中国岩溶,2014,(3):373-378,6.基金项目
国家自然科学基金青年基金项目(41302122) （41302122）
973计划项目(编号2011CB201001) （编号2011CB201001）
国土资源部公益性行业专项(编号201211082) （编号201211082）
