低对比度油层测录井综合识别方法研究与应用——以珠江口盆地陆丰油田为例

doi:10.11720/wtyht.2024.1164

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摘要

在储层评价中流体性质的准确识别是一个十分关键的问题。然而在珠江口盆地陆丰地区古近系低孔低渗储层,由于高阻水层的存在,使得油水层在常规测录井响应上对比度小,给油水层的准确识别带来困难。本文在明确低对比度油层储层特征与成因分析的基础上,针对低孔低渗储层中气测响应值受钻速、孔隙度等因素影响较大的问题,推导了Flair气测响应方程,建立Flair录井响应值校正方法。基于不同流体性质组分特征存在差异,采用Flair气测曲线构建新含油指数与含水率指数;同时采用伽马概率分布函数表征地化色谱图谱特征,提取形状因子与尺度因子进行图谱特征描述。基于敏感性参数,建立基于特征参数的流体性质识别图版。实际应用表明,综合测录井资料的流体性质识别方法具有较好的效果,识别符合率达91.3%,具有较好的推广价值。

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	刘伟男
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关键词 ：低对比度油层, 残余油, Flair录井校正, 地化色谱图谱, 伽马分布, 流体识别

Abstract：

The accurate identification of fluid properties is critical for reservoir evaluation.However,for the Paleogene low-porosity and low-permeability reservoirs in the Lufeng area,Pearl River Mouth Basin,the low contrast between oil and water layers in conventional logs due to the presence of high-resistivity water layers complicates the identification of oil and water layers.This study first ascertained the reservoir characteristics and genetic analysis of low-contrast oil layers.Then,it developed the Flair gas logging response equation and the Flair logging response correction method,aiming to overcome the challenge that gas logging response values of low-porosity and low-permeability reservoirs are significantly influenced by factors such as drilling rate and porosity.Given the differences in the properties and components of various fluids,this study constructed new oil-bearing and water-content indices using Flair gas logging curves.Moreover,this study characterized the geochemical chromatogram using a gamma probability distribution function and extracted the shape and scale factors to describe the chromatogram characteristics.Based on sensitivity parameters,this study plotted the characteristic parameter-based fluid property identification chart.The practical application shows that the log-based comprehensive fluid property identification method can yield satisfactory effects,achieving a compliance rate of 91.3%.Therefore,this method can be popularized.

Key words： low-contrast oil layer residual oil Flair log correction geochemical chromatogram gamma distribution fluid identification

收稿日期: 2023-05-13 修回日期: 2024-01-15 出版日期: 2024-06-20

ZTFLH:

P631.4

基金资助:中国海洋石油有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术”(KJGG2022-0406);中海石油(中国)有限公司深圳分公司生产性科研项目(SCKY-2024-SZ-14)

作者简介: 刘伟男(1995-),男,工程师,从事测井解释方法研究工作。Email:lwn1995@126.com

引用本文:

刘伟男, 管耀, 刘道理, 石磊, 宋伟. 低对比度油层测录井综合识别方法研究与应用——以珠江口盆地陆丰油田为例[J]. 物探与化探, 2024, 48(3): 573-583.
LIU Wei-Nan, GUAN Yao, LIU Dao-Li, SHI Lei, SONG Wei. Research and application of the log-based comprehensive identification method for low-contrast oil layers:A case study of the Lufeng oilfield in the Pearl River Mouth Basin. Geophysical and Geochemical Exploration, 2024, 48(3): 573-583.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1164 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I3/573

Fig.1 珠江口盆地陆丰凹陷区域地质^[17]

Fig.2 陆丰坳陷低对比度油层测录井L1井响应特征

Fig.3 陆丰古近系正常水层、高阻水层与油层矿物含量、孔隙特征对比

Table 1 研究区不同井、不同层位地层水矿化度分析

Fig.4 不同矿化度、不同饱和度岩石电阻率值模拟计算

Fig.5 陆丰凹陷古近系正常水层、高阻水层与油层相渗曲线

Fig.6 研究区高阻水层荧光薄片

Fig.7 校正前后气测值与含油饱和度关系(L1井)

Fig.8 陆丰古近系不同流体类型流体指数与含油性指数交会

Fig.9 陆丰凹陷古近系储层流体识别图版

Fig.10 不同流体类型典型地化色谱图谱特征

Fig.11 典型图谱形态与伽马分布拟合效果对比

Fig.12 不同尺度因子、形态因子伽马分布模拟

Fig.13 陆丰凹陷古近系地化色谱特征参数流体识别图版

Table 2 陆丰凹陷古近系流体识别与取样分析对比

Fig.14 测录井L9井综合流体识别成果

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