塔里木盆地哈拉哈塘地区奥陶系储层古岩溶作用及其与裂缝的关系  

Paleo-karstification of the Ordovician carbonate reservoirs and the relationship with fractures in the Halahatang area of Tarim Basin

作　　者：吴国强 张丽娟[2] 杨振周 袁文芳[2] 齐春艳 叶禹 Wu Guoqiang;Zhang Lijuan;Yang Zhenzhou;Yuan Wenlang;Qi Chunyan;Ye Yu(CNPC USA Corporation,,Beijing 100028,China;Tarim Oilfield, PetroChina, Korla, Xinjiang 841000,China)

机构地区：[1]中国石油休斯敦技术研究中心,北京100028 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《石油实验地质》2017年第6期790-796,共7页Petroleum Geology & Experiment

基　　金：中石油塔里木重大专项之"塔北超深碳酸盐岩油藏勘探开发关键技术"(2014E-2015)资助

摘　　要：塔里木盆地哈拉哈塘地区奥陶系为碳酸盐岩裂缝溶洞型储层,通过野外露头考察、岩心观察、薄片分析、扫描电镜-阴极发光谱分析、扫描电镜-X射线能谱分析等多种分析手段,综合分析了奥陶系储层的古岩溶作用类型及特征。通过野外露头类比,在西克尔露头识别出了粗粒垮塌杂乱角砾岩、细粒搬运杂乱角砾岩、高度扰动地层和未扰动地层等4种古洞穴相;通过岩心观察,在奥陶系不同层位均识别出了与古洞穴相关的杂乱角砾岩。奥陶系储层经历了准同生期岩溶、风化壳岩溶和埋藏岩溶3种不同的岩溶作用,形成的溶孔内部胶结物表现出不同的阴极发光谱特征。储层内部大量发育的裂缝对于埋藏岩溶作用具有重要影响,一方面可沟通缝合线系统,促进岩溶作用;另一方面直接沟通深部热液,导致岩溶作用的发生。The Ordovician reservoirs in the Halahatang area ol Tarim Basin are carbonate reservoirs and the storage space is karstic vugs and fractures. Types and characteristics ol paleo-karstilication in the Ordovician carbonate reservoirs were comprehensively analyzed by outcrop study,core observation,thin section analysis, SEM-CL spec-trum and SEM-EDS analysis. Coarse-clast collapsed chaotic breccia facies, line-clast transported chaotic breccia facies,highly disturbed strata lacies and undisturbed strata lacies were identilied in the Xikeer outcrop by outcrop analog. Chaotic breccia related to paleo-caves was lound in dillerent lormations ol the Ordovician under core observation. The Ordovician reservoir experienced three types ol paleo- karstilication,including penecontem- poraneous karstilication,weathering karstilication and buried karstilication. Different karstic vugs demonstrated dillerent SEM-CL spectrums. Widely developed lractures in the reservoir have a signilicant influence on burial karstilication. On one hand,lactures promoted karstilication by connecting stylolite networks; on the other hand, lractures induced karstilication by carrying deep hydrothermal lluids into the reservoir.

关 键 词：岩溶作用 碳酸盐岩 奥陶系 哈拉哈塘地区 塔里木盆地 

分 类 号：TE122.221[石油与天然气工程—油气勘探]