微区原位地球化学分析技术与应用——以古城地区碳酸盐岩储层成岩演化为例  

Geochemical analyzing technique of the microzone’s normal position and its application: A case study on the diagenetic evolution of the carbonate reservoir in Gucheng area

作　　者：邵红梅[1,2] 卢曦 高波[1,2] 洪淑新 潘会芳[1,2] 许智禹 白雪晶[1,2] SHAO Hongmei;LU Xi;GAO Bo;HONG Shuxin;PAN Huifang;XU Zhiyu;BAI Xuejing(Exploration and Development Research Institute of Daqing Oilfield Co Ltd,Daqing 163712,China;Daqing Branch of PetroChina Key Laboratory of Carbonate Reservoir,Daqing 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]中国石油碳酸盐岩储层重点实验室大庆油田研究分室,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2019年第5期160-168,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份公司重大科技专项“塔东天然气成藏理论及勘探配套技术研究”(2016E-0204)

摘　　要：为了明确古城地区奥陶系碳酸盐岩储层的孔隙成因、恢复储层的成岩演化过程,在精细岩相学研究基础上,综合应用微区原位地球化学分析技术,针对不同期次、不同组构的碳酸盐岩成岩作用产物,开展了微区稳定碳、氧、锶、硅同位素及常量、微量、稀土元素分析,并探讨了碳酸盐岩储层的成岩流体性质及其对储层孔隙的影响。结果表明:不同期次成岩产物具有不同的地球化学特征,指示了古城地区奥陶系储层经历了准同生期海源流体、浅埋藏期继承性海水、中深埋藏期地层卤水及外源热液流体的地质作用;流体性质直接影响储层孔隙演化,其中外源酸性流体产生的溶蚀孔洞可有效改善储集性能。研究成果可为古城地区碳酸盐岩储层发育规律研究提供实验技术支撑。In order to clarify the pore origin of Ordovician carbonate reservoirs in Gucheng area of Tarim Basin and restore the diagenetic evolution process of the reservoirs,on the basis of the fine study on the petrography,and moreover with the help of the comprehensive utilization of the microzone’s in-situ geochemical analyzing technique,the stable carbon,oxygen isotopes,strontium isotopes,silicon isotopes,constants,trace elements and rare earth elements were analyzed in the microzone in the light of different period-times and structural carbonate diagenesis products.And moreover the diagenetic fluid properties of the carbonate reservoirs and their influences on the reservoir pores were investigated.The results show that for the different diagenesis products,there are different geochemical characteristics,which indicates that the Ordovician carbonate reservoirs in Gucheng area have undergone the following geological actions:penecontemporaneous-stage marine-source liquid,shallow-burial-stage successional sea water,middle/deep-burial-stage and allogenic hydrothermal liquid;the liquid properties directly affect the pore evolution of the reservoirs,to be specific,the dissolved pore and vug resulted from the allogenic acid liquid can effectively improve the accumulating performances.The research results can provide the experimental technical support for the study on the carbonate reservoir development regulation.

关 键 词：储层成岩演化 元素地球化学 微区原位分析 古城地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]