摘要
Abstract
The Pearl River Mouth Basin is a typical Cenozoic continental marginal rift basin,and the Huizhou Sag in its northern depression belt hosts abundant condensate hydrocarbon reservoirs.The fluid properties of condensate hydrocarbon reservoirs are between those of conventional oil and gas reservoirs,featuring a high gas-oil ratio.The interpretation accuracy relying solely on gas logging data is relatively low.Restricted by marine environmental conditions and high operating costs in offshore operations,limited data are available from formation testing and sampling,which greatly increases the difficulty of identifying reservoir fluid types.To accurately characterize complex fluid properties,reduce the workload of pressure testing,sampling and formation testing,and cut operational costs,this paper introduces hydrocarbon phase logging technology and combines it with FLAIR gas logging technology,establishing a condensate hydrocarbon identification method integrated with hydrocarbon phase and FLAIR gas logging parameters.Relevant data from exploratory wells with hydrocarbon phase logging and FLAIR gas logging in the Huizhou Sag are collected and sorted out,including dual logging data as well as corresponding well logging sampling and formation testing datasets.Representative data points are screened,and oil-gas sensitive parameters(e.g.,oil-gas separation index derived from hydrocarbon phase logging,gas index from FLAIR gas logging)are calculated and optimized to construct an integrated hydrocarbon evaluation chart combining hydrocarbon phase indicators and FLAIR parameters.Field application results indicate that the proposed identification method integrates the strengths of the two logging technologies,and its fluid type identification results are highly consistent with pressure measurement,sampling,formation testing and PVT experimental data,which verifies the validity and reliability of this method.The research provides effective technical support for the identification of complex fluid properties in the Pearl River Mouth Basin.关键词
惠州凹陷/凝析油气/烃相态/气测录井/流体类型Key words
Huizhou Sag/condensate oil and gas/hydrocarbon phase state/gas logging/fluid type分类
天文与地球科学
