玉北地区奥陶系碳酸盐岩埋藏型岩溶发育特征及有利储层分布  

Buried Palaeokarst characteristics and favorable reservoir distribution of Ordovician carbonate rock in Yubei area

作　　者：牛君 黄文辉[2,3] 梁飞[2,3] 王文勇[2,3] 万欢[2,3] 游声刚[2,3] 张亚美[2,3] 

机构地区：[1]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [2]中国地质大学(北京)能源学院,北京100083 [3]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083

出　　处：《东北石油大学学报》2017年第6期74-84,95,共12页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05009-002-203);中国石化西北油田分公司勘探开发研究院协作项目(KY2011-S-070);中国石油大学(北京)克拉玛依校区科研启动基金项目(RCYJ2017B-01-002)

摘　　要：塔里木盆地玉北地区奥陶系碳酸盐岩发育多种形式的岩溶作用,其中埋藏岩溶作用是形成有利储层的重要机制之一。利用岩心观察、岩石薄片鉴定、阴极发光、扫描电镜、测井解释和地化分析等方法,分析研究区埋藏型岩溶发育特征,预测有利储层分布。结果表明:埋藏型岩溶主要发育层位为蓬莱坝组及东部断裂带的鹰山组;发育特征表现为高角度裂缝发育导致的溶蚀作用、沿缝合线发育导致的溶蚀作用、沿晚期裂缝发育的"串珠状"溶孔及与断裂作用相关的油气或沥青充注等,成岩介质流体为多种流体组合。受海西运动影响,蓬莱坝组地层深部断层发育;海西运动晚期,成岩介质流体沿深部断裂向上运移,使下部岩溶相对上部岩溶更为发育,并具有顺层溶蚀特点。断层的发育对埋藏型岩溶具有良好的控制作用,低角度裂缝对埋藏流体的侧向运移具有良好的疏导作用。海西运动晚期发育的断裂带为研究区主要岩溶作用区及优质储层分布区。Various types of karstification effects have developed in the Ordovician carbonate reservoirs in Yubei area of the Tarim basin. Burial karstification play important roles in favorable reservoir formation. By means of core,thin section analysis,cathodoluminescence,scanning electron microscopy,well logging and reservoir geochemical data,burial karstification features of Ordovician carbonate rock in study area were analyzed and favorable reservoirs were forecast. The results showed that burial karstification is mainly developed in Penglaiba forma-tion and Yingshan foramtion of the eastern fault zone. Burial karstification shows many burial karstificaiton characteristics such as buried cement dissolved into the pore,dissolution developed along high-angle fracture and stylolite,bread shaped dissolution pore along the late cracks and oil or asphalt related to fracture. The diagenetic media in burial karstification massed various deep stratum fluid. Because of the late Paleozoic Hercynian campaign,the diagenetic medium fluid is transported along the deep fault in which leaded lower part of karstification is better developed than upper part. Bedding-parallel dissolution pores also developed in Penglaiba formation.The most favorable area of buried karst is the scope where fault develops,and low-angle fractures have a greater lateral impact on the buried karst. Beneficial buried karst region and the high quality reservoirs should be near the late fault which developed in the later of Hercynian.

关 键 词：碳酸盐岩 埋藏岩溶作用 断裂活动 篷莱坝组 奥陶系 玉北地区 塔里木盆地 

分 类 号：P618.130.2[天文地球—矿床学]