塔中地区奥陶系碳酸盐岩埋藏溶蚀特征及初步预测  

Burial Karst Characteristics and Preliminary Estimates of Ordovician Carbonate Reservoirs in Central Area of Tarim basin

作　　者：马红强[1] 姜海健[1] 王恕一[1] 陈强路[1] 李慧莉 沙旭光 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214151 [2]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [3]中国石油化工股份有限公司西北油田分公司石油勘探开发研究院,新疆乌鲁木齐830011

出　　处：《新疆地质》2012年第1期73-79,共7页Xinjiang Geology

基　　金：国家重点基础研究发展计划"973"(2005CB422100);国家科技专项(2008ZX05005-002-001)资助

摘　　要：塔中地区奥陶系碳酸盐岩发育多种形式岩溶作用,其中埋藏溶蚀是形成有利储层的重要机制之一.录井岩心分析化验资料及宏观地质背景分析表明,塔中地区奥陶系碳酸盐岩主要发育4期埋藏溶蚀,其中Ⅰ、Ⅱ期溶蚀孔洞基本已被充填,Ⅲ期残留部分孔隙和Ⅳ期溶蚀孔洞为现今储层有效储集空间.上奥陶统良里塔格组现今未被充填的粒内溶孔及铸模孔可能主要形成于埋藏溶蚀,并非准同生溶蚀.埋藏溶蚀发生的流体介质主要为有机质演化过程中形成的有机酸和CO2,在更深部或经历更高热史经历的区域,H2S对储层的形成可能会有较大贡献,热水-热液溶蚀对储集空间贡献有限.初步分析表明,卡塔克隆起西北部埋藏溶蚀孔隙较发育,塔中南部台地边缘带可能是埋藏溶蚀另一相对较发育地区.Various types of karstification effects have developed in the Ordovician carbonatere servoirs of the central Tarim Basin.The deep burial and hydrothermal Karstification effects play important roles in favorable reservoir formation.Analyses of well cores,logging data and geological background have indicated that, there are mainly 4 stages of burial Karstification effects in the area.The pores in stages Ⅰ and Ⅱ have been filled.The residual pores in stage Ill and the corrosion pores in stage IV work as effective reservoir space for present reservoirs.The main flud medium include organic acid and CO2 generated during organic evolution.HES may contribute to late reservoir formation.Hydrothermal Karstification is effective to 0rdovician reservoir transformation.The influence and evaluation still require further research.Preliminary analysis shows burial karstification pores is development in northwest of central Tarim Basin,the next oen is plateform margin in south of central Tarim Basin.

关 键 词：塔中地区 奥陶系 埋藏溶蚀 碳酸盐岩 

分 类 号：P618.13[天文地球—矿床学]