胡尖山—姬塬地区长7段油页岩定性定量评价及长9油藏勘探评价  

Qualitative and quantitative evaluation of Chang 7 oil shale and exploration evaluation of Chang 9 reservoir in Hujianshan—Jiyuan Area

作　　者：郑奎[1] 杨晋玉 胡晓雪[1] 张换果 李海菲 李彦秋[1] ZHENG Kui;YANG Jinyu;HU Xiaoxue;ZHANG Huanguo;LI Haifei;LI Yanqiu(No.6 Oil Production Plant,Changqing Oilfield Company,PetroChina,Xi’an 710200,Shaanxi)

机构地区：[1]中国石油长庆油田分公司第六采油厂,陕西西安710200

出　　处：《长江大学学报（自然科学版）》2022年第5期27-36,80,共11页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069);中国石油天然气股份有限公司重大科技专项“长庆油田5000万吨持续高效稳产关键技术研究与应用”(2016E-05-02)。

摘　　要：鄂尔多斯盆地胡尖山—姬塬地区长9油藏油水分布关系复杂,给勘探带来较大困难。长9油藏的油源来自于长7段油页岩,并与长9油藏构成了“上生下储”型生储组合。为此,以长9油藏的成藏理论为指导,开展了基于测井资料的长7段油页岩识别,用以指导长9油藏有利区的快速识别。通过岩性与测井系列分析认为,研究区长7段油页岩测井表现为“高自然伽马、高电阻率、高声波时差、低密度、低自然电位”的特性,依据该特性,形成了定性识别油页岩的“三步法”:第1步,利用自然伽马曲线排除砂岩;第2步,依据页岩渗透性特点,利用自然电位曲线确定页岩;第3步,综合声波时差、密度及电阻率曲线的特征,最终确定油页岩。在油页岩定性识别的基础上,通过砂岩基线与自然伽马曲线、泥岩基线与自然电位曲线、自然电位与自然伽马曲线、声波时差与密度曲线的交会面积及油页岩厚度共5项参数,定义了油页岩“综合影响系数”参数,用以定量表征油页岩发育程度。应用长7段油页岩的量化评价结果指导长9油藏的勘探评价,发现了H89等3个油藏,应用效果较好。The oil and water distribution of Chang 9 reservoir in Hujianshan—Jiyuan Area of Ordos Basin is complex,which brings great difficulties to exploration.The oil source of Chang 9 reservoir comes from Chang 7 oil shale,and it forms a“upper generation and lower storage”type reservoir combination with Chang 9 reservoir.Therefore,guided by the accumulation theory of Chang 9 reservoir,the identification of Chang 7 oil shale based on logging data wascarried out to guide the rapid identification of favorable areas of Chang 9 reservoir.Through the analysis of lithology and logging series,it is concluded that the logging performance of Chang 7 oil shale in the study area is characterized by“high natural gamma,high resistivity,high acoustic time difference,low density and low natural potential”.According to these characteristics,a“three-step method”for qualitative identification of oil shale is formed.In step 1,the natural gamma curve is used to eliminate the sandstone;In step 2,the natural potential curve is used to determine shale based on the permeability characteristics of shale;In step 3,the characteristics of acoustic time difference,density and resistivity curve are integrated to finally determine oil shale.Based on the qualitative identification of oil shale,the“comprehensiveinfluence coefficient”parameter of oil shale is defined by five parameters:sandstone baseline and natural gamma curve,mudstone baseline and natural potential curve,natural potential and natural gamma curve,intersection area of acoustic time difference and density curve,and oil shale thickness,to quantitatively characterize the degree of oil shale development.The quantitative evaluation results of Chang 7 oil shale are used to guide the exploration and evaluation of Chang 9 reservoir.Three reservoirs such as H89 are found and the application effect is good.

关 键 词：鄂尔多斯盆地 胡尖山—姬塬地区 长7段油页岩 定量评价 定性评价 测井响应特征 长9油藏 

分 类 号：P631.84[天文地球—地质矿产勘探]