基于气测烃组分的储层流体相快速识别评价方法——以渤中19-6构造为例

Rapid identification and evaluation method of fluid phase in reservoir based on hydrocarbon component by gas logging-case study of Bozhong 19-6 structure

胡云 刘宝生 汪芯 刘娟霞 胡天玮

HU Yun LIU Baosheng WANG Xin LIU Juanxia HU Tianwei

中海石油(中国)有限公司天津分公司 中法渤海地质服务有限公司

Tianjin Branch of China National Offshore Oil Co., Ltd., Tianjin 300459, China China-France Bohai Geoservices Co., Ltd., Tianjin, 300459, China

处于气液同存交错状态的复杂油气藏，存在油层出气与气层出油的普遍现象，流体相态识别难度非常大，流体类型的混淆会给后期储量的提交带来严重阻碍。为了快速识别油气同存的储层内流体相态，根据气测烃类组分特征差异，提出了星形图法、Bar图法和FLAIR油气水指数法，可有效识别储层内流体相变化特征。利用该方法对渤中19-6构造深埋低孔渗砂砾岩及潜山储层进行快速流体相分析，研究表明深部储层的流体相为气相特征，局部交错发育油环，流体性质主要为凝析气含凝析油。利用该法分析所得结论与试油结论完全相符。实践证实，基于气测烃组分特征差异的流体评价方法，可快速准确地解释评价复杂结构储层内的流体相态。

For complex oil and gas reservoirs with gas-liquid interlacing state, the common phenomenon of gas inoil layer and oil in gas layer makes it very difficult to identify fluid phase.The lack of knowledge of fluid type will bring confusionto the determination of reserves.In order to quickly identify the fluid phase in the reservoir with oil and gas, based on the differences of hydrocarbon component characteristics measured by gas logging, the Star diagram method; Bar diagram method and FLAIR oil, gasand water index method are proposed, which can effectively identify the fluid phase change characteristics in the reservoir.The proposed method is used to analyze the fluid phase of the buried low-porosity and low permeability glutenite and burial hill in the Bozhong 19-6 structure.The results showed that the fluid phase of the deep reservoir is gas phase with local oil ring, and the fluid property is mainly condensate gas containing condensate oil.The resultsare consistent with the oil testing conclusion.The proposed method can be used to quickly and accurately identifyand evaluate the fluid phase state in the reservoir of complex structure.

10.13639/j.odpt.2018.S0.012