塔中地区中下奥陶统鹰山组表生岩溶分布特征及主控因素  

Distribution characteristics of supergene karst and dominated factors analysis in Yingshan Formation of Lower-Middle Ordovician in Tazhong area

作　　者：和虎[1] 冯海霞[2] 蔡忠贤[1] 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2015年第2期17-23,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"中国海相碳酸盐岩层系油气输导体系与运聚机理"(2005CB422105)

摘　　要：塔中地区中下奥陶统鹰山组主要经历加里东中期—海西早期多期构造运动,形成多个不整合面,发育多期表生岩溶,目前对影响鹰山组多期岩溶分布特征的主控因素的分析不够深入。为此,在鹰山组古地貌岩溶层识别与对比的基础上,对岩溶分布的影响因素进行分析,总结其主控因素。研究区中下奥陶统为稳定的台地沉积,利用残余厚度等时间图恢复鹰山组岩溶古地貌,并划分为岩溶高地、岩溶斜坡和岩溶盆地3个地貌单元。通过对塔里木盆地表生岩溶洞穴层发育深度的分析,将研究区表生岩溶发育深度定为不整合面以下180 m内。综合应用钻井、岩心、测井和地震等资料识别岩溶层,在岩溶层对比分析的基础上研究发现,3个岩溶台面对应发育3个岩溶层,并且岩溶层主要发育在岩溶斜坡上,影响表生岩溶分布特征的主控因素为岩性和构造。The multi-phase supergene karst have developed with multi-plane of unconformity in Tazhong area of the Low-er-Middle Ordovician Yingshan Formation that mainly went through the middle Caledonian-early Hercynian tectonic move-ments,but the dominated factors affecting the distribution characteristics of supergene karst were not analyzed deeplyenough at the moment. In the study area the Lower-Middle Ordovician is a set of stable platform deposition. The karst pal-aeogeomorphology of the Yingshan Formation was recovered using isochronous residual thickness and was divided intothree geomorphic units as karst highland,karst slope and karst basin. Combining with the cave-depth analysis of the super-gene karst in Tarim,the depth of supergene karst in the study area is within 180 meters below the unconformity. Karst lay-ers were identified through integrating drilling,core,log and seismic data. It is found that 3 karst platform surfaces are cor-responding to 3 karst layers based on the karst layer comparative analysis in the study area,and the karst layers mainly de-veloped in the karst slopes. The main factors affecting karst distribution are lithologic and structure.

关 键 词：中下奥陶统 鹰山组 表生岩溶 主控因素塔中地区 

分 类 号：TE112.23[石油与天然气工程—油气勘探]